Bench Bleed Master Cylinder Without Vise

I am not sure if this has forced out all the air, including those in the master. I used some brake cleaner and blew out all the holes with air after cleaning. Make sure it's level when you tighten the vise. You should be bench bleed the master cylinder anytime you are removing or replacing it from your Corvette. If you're purchasing a master cylinder, you'll find that most come with a bleeding kit but if you're removing and reinstalling a master cylinder, you'll need to have barb fittings and clear tubing to complete this job. Allow the master cylinder to gravity bleed. Take a dummy line or our M/C bleeding kit and hook it up to the two ports. Using his slick-looking 1947 Ford F1 for demonstration, Brent Ackley teaches you how to replace a master cylinder on a classic car by disconnecting the brake light switch and brake lines, removing the old master cylinder and bench bleeding the new one. Use the next steps as an alternative bench bleeding method to ready the brake master cylinder before you install it. Yes it was bench bled. Does anyone have any other suggestions on bleeding the master cylinder? Will gravity bleeding work without bench bleeding the master cylinder? I could go buy a vise, but my work bench's are not worth bolting a vise to. Could it be the proportioning valve and if so can it be repaired or does it have to be replaced? Thanks in advance. Can someone tell me; How do I bleed the master cylinder for the first time without screwing the new master cylinder up?. The new bleeder kit comes with solid plugs to bench bleed the replacement unit. It's said you can use a table/wall, but I like to know it's not going anywhere. Supplies: Fittings for bleeding hose (usually included with new Master Cylinder) Bleeding Hose (usually included with new Master Cylinder). Once the reservoir gets too low it will allow air to enter the brake line. 2000-01 BRAKES Disc & Drum - Trucks - Except Tracker MODEL IDENTIFICATION Vehicle model can be identified by fifth character of Vehicle Identification Number (VIN), stamped on metal pad on top of left end of instrument panel, near windshield. Connect the pressure bleeder to the master cylinder reservoir. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35. While common "gospel" says you must bench bleed before mounting, I simply refuse to do it this way, and will. I was happy and thought I had purchased a winner but unfortunately, not even a minute later, the suction is loss and the vise topples over. Overextending the rod might damage the seals inside. , If Ordered Now, Ships in 4 Business Days 100% guarantee. Remove the filler cap assembly, not shown. One, as the name implies, is to bleed the master cylinder clamped in the vise on the bench using a large punch to move the cylinder in and out until the air is evacuated from the cylinder. Position the master cylinder in a vise so that the jaws clamp on the mounting flange and the attachments for the brake hoses to the fluid reservoir are oriented upward. Place the brake master cylinder in a vise and attach the brake master cylinder bleeding kit routing the tubes into the master cylinder reservoir. Ready to go back in. The master cylinder reservoir has a large rear section and. Tighten the jaws just enough to keep the master cylinder firmly in place, but without damaging it. The new rod is too short. No more warning lamps, alarms, or death-defying stops using the hand-controlled emergency parking brake. Then push the piston into the bore in order to force. It's almost impossible to completely "prime" the master cylinder in the car, and any trace of air left in it will produce unusual and unexpected problems with your braking system. you can buy a kit the contains fittings and hoses to do this on the car. master bleeding kits are sold for pennies. Be sure to continually top off the master cylinder with fre sh brake fluid so i t won’t run dry and draw in air. Bench bleeding the brake master cylinder before installing it on the car is necessary to help remove the air so normal pedal firmness and height can be obtained. If the master cylinder is not level, not all the air will be able to be removed from the master cylinder. Bench bleeding, also known as "burping," will remove any air from the new master cylinder before installation. You may have to register before you can post: click the register link above to proceed. Depending on how your system is routed (high spots will hold more air bubbles), you may also consider power bleeding or manual bleeding the system. Position the master cylinder in a fixed-upright position in a vise. How do you guys bench bleed a master cylinder and not leak fluid out of it when installing on car? I really don't want to get fluid on the car and my master cyl is painted as well. I found an easier way is to bleed the air out of the system backwards. Clamp down until the cylinder will not move. The master cylinder does have to be bled before use in order to purge it of air. pedal nice and firm. The new rod is too short. They usually come with 2 hoses and plastic fittings. For the entire 4 years that I was making a living turning wrenches, we just slapped the MC on and bled it out the wheel cylinders and were done with it. Secure the M/C in a vise. we bled inlaw's work van not so long ago, it took quite a bit of fluid in. Master cylinder bore size too small for the system volume requirements. This event converges innovative minds and bestseller automotive products to chance to see 3,000 new and innovative tools, parts, and components. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35. It will travel about 3/4" at first, and bubbles will appear in the fluid. It does not take long to get it free and clear of bubbles. bleed system. hopefully their is another option. Connect the pressure bleeder to the master cylinder reservoir. It took several piston plunges with a small dowel to remove all of the air from the system, with the clear tubing it was very easy to see when all of the air was out. Step 1: Place your master cylinder in a vise by the mounting ears (not the body) Step 2: Attach a short piece of brake line to each fitting. Cylinder Clutch Master Cylinder Brake Master Cylinder Brake Fluid Reservoir Feed Line for Clutch Master Cylinder Bleeder Valve Here is the clutch hydraulic system at rest, but there are air bubbles trapped in the clutch slave cylinder. Remove the bleeder hose from the top, apply some clear plastic, and cap the reservoir. Another idea is to use a vise and position the mounting flange between the jaw clamps. Here is the cool part: the directions for the master cylinder give you the step by step procedure on how to bench bleed it. close the master cylinder carefully, without letting any dirt fall into it. MASTER CYLINDER BLEEDING. How to Replace a Clutch Master Cylinder. If you've just rebuilt the master cylinder on your vehicle or you've purchased a new or re-manufactured one and are about to install it, you're going to want to bench bleed the master cylinder. When pumping with the plugs, the stroke will get shorter and shorter, and the plunger will not move at all when ALL the air is out. Clamp the cylinder firmly into place, making sure that it's level. Sometimes after installing a fresh brake master cylinder into an MGB (or any other car) the pedal will often repeatedly go to the floor and it may take many cycles of pedal pressing and bleed screw opening & closing before reservoir fluid even begins to slowly trickle its way down into the master cylinder. The advantages of the new process are: More efficient to bleed the master cylinder. Remove the filler cap assembly, not shown. There's nothing fancy about it, no special kit that cycles the fluid back in. bench bleed first. In any case try bleeding the master cylinder before bleeding the wheel cylinders again. Bench bleed the master cylinder before installing it. This step will save you time and energy since the master cylinder is the heart of the hydraulic brake system. I changed it out a week ago and now the car brakes perfectly without issues. Combined with a stock style proportioning valve. 2000-01 BRAKES Disc & Drum - Trucks - Except Tracker MODEL IDENTIFICATION Vehicle model can be identified by fifth character of Vehicle Identification Number (VIN), stamped on metal pad on top of left end of instrument panel, near windshield. I don't have a bench bleeding kit but is it possible to get it done without it? I have no idea how to do it so just need a little help to guide me to get my brakes working again. While common "gospel" says you must bench bleed before mounting, I simply refuse to do it this way, and will. Get it as soon as Tue, Aug 13. Because most master cylinders are pretty airtight, you shouldn’t lose brake fluid in any quantity unless it’s leaking out somewhere else. Just don't use the dining room table!. C) A clear bleed tube and catch bottle should be attached to the bleed screw (not provided). I bought a 1970 Chevy Nova master cylinder and have bench bled it. Bob Hewitt wrote: Fill the reservoirs with new brake fluid, and pump the piston slowly and evenly, full strokes. Experience. And bleeding. A bench-mounted vise is a great tool for the job. DOT 3 brake fluid 4. If you don't have one or don't have a bench at all, you can buy a clamp-on vise that can be removed when you're done. There are only two bleeders on the Master Cylinder (some have no bleeders, in which case crack the lines and use the old-fashioned two-person method). Bench bleeding your master cylinder is not necessarily all that complicated, but if we can make it even easier for you…we will. This will save a lot of time and heartache when bleeding the brake system. I tried vacuum suction to bleed, but it didn't work. 2) If the master cylinder is new or went dry at any time during the installation, begin by bench bleeding the master cylinder. Before installing the master cylinder on vehicle, it must be bled on the bench as follows: (1) Clamp master cylinder in a vise and attach bleeding tubes Tool C-4029. As I stated before, since you didn't bench bleed the mc, you are now unable to cycle the push rod fully with the mc. This will fill the MC with fresh air-free fluid and in effect "prime" it. A DIY Brake Bleeder Using Either Pressure or Vacuum: A brake bleeder is a handy one man device to change the hydraulic fluid in your car or motorbike. Remove the old brake master cylinder from your Cadillac Escalade. If you use the vise, be careful not to over tighten the vise as you can damage the internal workings of the cylinder. If you master cylinder is older and dirty, be sure to thoroughly clean it before disassembly. bench bled it to test if it was for sure the master, it was. Open up the bench bleed kit and have it close by. If you don'y bench bleed a master cylinder you stand a chance of not being able to get the unit to prime enough to ever begin pumpingthen you end up bench bleeding it in the car and making a huge mess you could have avoided by using the BENCH in the first place. 0, Volkswagen Jetta III TDI, Volkswagen Passat B3. one more question, on the instructions it said i needed to stick the brake booster in a vise or something like that to bleed it before i even put it in the car, is that true? could that be causing these symptomes since iwas to lazy to do that?. "Bench bleeding" seemed to make sense but it was not practical because when locating the master cylinder plus brake booster assembly back to it's place it had to be turned and twisted and turned in just one way to locate it right. This will save a lot of time and heartache when bleeding the brake system. Some people will strongly recommend you bench bleed the new master before installing. I bleed disc brakes by just opening the valve without pushing the pedal. Dealing With A Low Brake Pedal. This handy, innovative tool is a must, just as bench bleeding is for removing all the air from your brake system, allowing you to spend less time in the. This is where you have to use some judgement and position the piston, if its. Click here for more details or check out the October 2012 issue Mustang Monthly Magazine. You will notice that the master cylinder piston is not resting against the snap ring, figure 3. Bench job done right: you need a set of master cylinder plugs. Join the Community! DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. It’s that easy, but takes a while to get around the whole job. Screw the plastic fittings supplied in the bench bleeding kit with the new master cylinder into the holes where the brake lines connect. Remove the bleeder hose from the top, apply some clear plastic, and cap the reservoir. Be sure to place the master cylinder level in a vice to secure it properly. Here are the steps to pressure bench bleed a master cylinder:. Bleed these first. Get it as soon as Tomorrow, Sep 24. Defective rebuilt master cylinder with pitted cylinder bore or defective pressure seals. Man what a pain. This can easily be done by bench bleeding the master cylinder prior to installation. I wanted something a little better. If you use the vise, be careful not to over tighten the vise as you can damage the internal workings of the cylinder. Set your new Saturn Ion master cylinder in a bench vise; if you don't have a bench vise, you can use a clamp-on vise and an old table. Regardless, I got it done. need more help call 610-521-1650 ask for bill. You will need: A brake bleed screwdriver or wrench. Replacement Master Cylinder Parts For Titan Model 60 Brake Actuator Question: My fill cap is stuck, i put liquid wrench to try to loosen but will not budge. Now if you have a vise, clamp the master into it, if not, you can use a counter top and place the master against the wall for support. Depending on how your system is routed (high spots will hold more air bubbles), you may also consider power bleeding or manual bleeding the system. Gather your supplies. Wash hands thoroughly after handling. As you get fluid going into a jar, close that bleed fitting. The bleeder screws on the calipers are not facing up. Diy Bench Bleed Master Cylinder: A claw hammer, wood chisel set, a hand saw, a miter box with a saw (for cutting angles), a coping saw, finish punches, flat and straight tip screwdrivers, a rubber mallet (for tapping pieces together while not damaging the wood), woodworking clamps, a wood vise, a bench plane, a rasp, a tape measure, a 12 steel. Once you've done that, it's time to prepare for removing the master cylinder. I was wondering since i installed the master cylinder in without bench bleeding it, the brakes used to be really good and for past two years it has been sitting and then i came back the brakes arent good anymore. Just don't use the dining room table!. This will save a lot of time and heartache when bleeding the brake system. Slowly, steadily push the cylinder piston in with a wooden dowel. The master cylinder bench bleeding kit consists of adapter fittings that screw into the master cylinder and tubes that attach to the fittings of the master cylinder. To bench bleed the section of the master cylinder that feeds the rear brakes, the front brake output tubes must be clamped closed to produce the needed back pressure. Best Answer: The 1997 Jetta has a bleeding sequence of its own. 10) Some master cylinders and booster units have bleed screws. Bench bleeding procedures are as follows: Mount the master cylinder in a vise. I need to bench bleed my master cylinder, but I don't have a vise to hold it. Usually I have my wife at the peddle. It’s that easy, but takes a while to get around the whole job. Clamp the cylinder firmly into place, making sure that it's level. Must have been one of the seals inside the master causing all the air to come in. Position the maser cylinder on a work bench or table and make sure it is supported properly. If you're using a new master cylinder then, yes, you should bench bleed it to remove the air and fill the passages with fluid. Clamp down until the cylinder will not move. So I purchased and installed a MC for a 1967 Ford Fairlane and could only bleed the rear brakes. DO NOT tighten vise enough to damage master cylinder. I bleed disc brakes by just opening the valve without pushing the pedal. A master cylinder may be bench bled in one of the following methods: METHOD A: Bench bleeding using Outlet Port Plugs (Figure 1) Clamp master cylinder securely by mounting flange in a bench vise. poor design. How to Bench Bleed your Master Cylinder: After successfully rebuilding a master cylinder (or when fitting a new one) it is a good idea to bench bleed the MC before installing it in the car. If you use the vise, be careful not to over tighten the vise as you can damage the internal workings of the cylinder. Brent Ackley shows you how to bench bleed a master cylinder by using bleeding ports, attaching little hoses and adding brake fluid. Bench-bleeding fills the cylinder bore and outlet ports with fluid and drives out all the trapped air in-between all the moving components and in the drilled passages. Bench Bleeding The Master Cylinder Caution, whenever you work with brake fluid keep in mind that it will do a great job of taking paint off any surface it contacts. No more warning lamps, alarms, or death-defying stops using the hand-controlled emergency parking brake. I bench bleed the master cylinder in the vise by using the supplied brake pedal rod and the installed the new master cylinder and rod into the Bronco. Yes it was bench bled. bench bleed master till no air is seen traveling through bleeder kit hoses:With philip head screw driver or wooden dowel slowly push the master cylinder piston in about one. Clamp down until the cylinder will not move. Reposition the master cylinder in the vise. Air Bubbles BLEEDING THE CLUTCH HYDRAULIC SYSTEM Connects to Clutch. Unlike with bleeding a separate or new master cylinder, you can do this without gathering new parts or equipment. If inverted flare plugs are not made, does something else work to keep the brake fluid from leaking out of the master cylinder without damaging the threads on the master cylinder outlets? If so, you'd have to remove the bench bleeder fitting quickly, hold your finger over the master cylinder outlet, then insert and tighten the plug. you can buy a kit the contains fittings and hoses to do this on the car. Master cylinder must be level for proper bleeding. Brake fluid is a world class paint stripper and bench bleeding keeps some of the possible mess away from the vehicle. reconnect brake lines, and reinstall bleeder screws. Check out this rebuild on our 1969 Jeep CJ-5 inside 4Wheel & Off-Road Magazine. This will save a lot of time and heartache when bleeding the brake system. BENCH BLEEDING INSTRUCTIONS 1. Get yours online today and pick up in store. bench bleed first. Ford Fusion owners have reported 151 problems related to brake master cylinder (under the service brakes category). Gravity bleeding can be the slowest, but least harmful to the brake system. Sounds stupid,huh? When master cylinder piston retracts,,,it pulls a vacuum on the system. BENCH BLEED THE MASTER CYLINDER. If you have a bench vise, secure the master cylinder in a vise. It works great on the Tempo too. Then pressed pads out far as possible and blocked w/ a piece of 3/16 aluminum flat stock incase calipers closed. The new Eastwood Brake Bleeder allows you to do the job of bleeding the brake system all by yourself without depressing the brake pedal or wasting any fluid. I do a gravity bleed to start (fill master cylinder reservoir, open bleeder) until I get some fluid out of the bleeder. When brake fluid is leaking from the seals, the driver should notice a leak at the back of the master cylinder bore. A few friends have advised replacement of the master cylinder and doing a bench bleed of the new unit. The master cylinder reservoir has a large rear section and. I removed the Master cylinder to pull out he new rod and swap it with the old one, but the new rod will not. Supplies: Fittings for bleeding hose (usually included with new Master Cylinder) Bleeding Hose (usually included with new Master Cylinder). Secure the tubes. This was the first time I used my AC vacuum pump to bleed the lines. Put the cylinder in a vise and fill with fluid. Then I started to bleed the brakes. Best Answer: If you're reusing the same master cylinder and don't dump the fluid it really isn't necessary. But I got it back in there. Nissan Datsun 1200 1971-73 Brake Repair Guide Master cylinder is tandem piston type. A few friends have advised replacement of the master cylinder and doing a bench bleed of the new unit. install bleeder tubes into the outlet ports to direct fluid back into the reservoir so the ends of the tubes will be under the level of the fluid 2. This can easily be done by bench bleeding the master cylinder prior to installation; Step 1: Place your master cylinder in a vise by the mounting ears (not the body) Step 2: Attach a short piece of brake line to each. If the brake pedal holds constant pressure, without dropping, all is good. Place the master cylinder in a vise or hold it down to a firm surface. You can verify this condition by removing the master cylinder from the booster without disconnecting the brake lines. Slide the master cylinder to the booster's studs. 1) Master cylinder must be bled before installation to prevent excessive amounts of air from entering the brake system, creating poor brake operation. No I always bleed the master cylinder in a vise first. Gather your supplies. I asked an old timer at work when I was fixing cars if bleeding a master was necessary, he said lets try it without bleeding. Some people will strongly recommend you bench bleed the new master before installing. I had the same exact issue, it's the Master Cylinder. Brake bleeding is one of the most important things you can do to ensure the proper operation of your brakes and the safe operation of your vehicle. Fill it up, cover off. Now if you have a vise, clamp the master into it, if not, you can use a counter top and place the master against the wall for support. With easy bleed on the slave bleeder, put the pump over the hole on master cylinder lid with a bit of downward pressure to make an air tight seal and then give 3 or 4 pumps. It makes it a lot easier to remove the air from the lines if you're starting with a properly bled master cylinder. build up any pressure when I was bleeding. normal braking, the master cylinder, power booster and wheel brakes units all function as they would in a vehicle without ABS. brake lines. I'm narrowing it down to the master cylinder now. I have to say the vacuum pump was fast and easy and none of the "I men't down dear". They usually come with 2 hoses and plastic fittings. Then, tie a length of rope to the clutch pedal so you can pull the pedal back up. How to Bench Bleed your Master Cylinder: After successfully rebuilding a master cylinder (or when fitting a new one) it is a good idea to bench bleed the MC before installing it in the car. A bench-mounted vise is a great tool for the job. Thread plastic fittings into the outlet ports of the master cylinder, and tighten with wrench. 1) The master cylinder comes with a deep piston. If that happens, you have to go back and bleed your master cylinder until you suck the air out of that end of the system. What is claimed is: 1. This can easily be done by bench bleeding the master cylinder prior to installation. Symptoms of a bad master cylinder include external and internal leaks. Depending on how your system is routed (high spots will hold more air bubbles), you may also consider power bleeding or manual bleeding the system. not line least two *ttnecorrect the outlet require pushrtxi Miustøte Figure Multiple Mounting Adapter Mounting Bolts BLEEDER TUBES METHOD B: Bench Bleeding using Bleeder Tubes (Figure 2) I) Clamp master cylinder securely by the mounting flange in a removes atr from the cylinder bore. Parts are just part of what we do. Get your vacuum pump ready by connecting the pump's reservoir jar with a piece of tubing. For bench priming, mount the brake master cylinder (2140) in a vise. So the question is, will it still be any advantage to bench bleeding the master cylinder. ) several times again. Bleeding Brake Mystery. Reposition the master cylinder in the vise. Remove the filler cap assembly, not shown. Essentially, this involves putting the master in a vise, connecting some tubing from the output where the line goes back up to the cylinder, and using a screwdriver or similar to push the plunger in and out while topping it off with fluid. You will notice that the master cylinder piston is not resting against the snap ring, figure 3. I need to bench bleed my master cylinder, but I don't have a vise to hold it. Check out some of the frequently asked questions they get. However, bench-bleeding is the traditional, time-honored way to eliminate air from the master cylinder's bore. Clamp master cylinder securely by the mounting flange in a bench vise. It will travel about 3/4" at first, and bubbles will appear in the fluid. You'll need steadiness to bleed the master cylinder. Regardless, I got it done. Wilwood Master Cylinder One of the major fail points for a TR6 brake system is the Master Cylinder. I would take it off and bench bleed it. For an older vehicle without an antilock braking system, this process will do a great job even if you have air in the system, say, after replacing a caliper or master cylinder. I purchased a new master cylinder for a 1976 Ford Bronco. A second reason is to get air out of the master cylinder without pushing it down the brake pipes. As you get fluid going into a jar, close that bleed fitting. The master cylinder reservoir has a large rear section and. See our procedure for Bench Bleeding the Master Cylinder. CARDONE Service Plus Master Cylinder Bench Bleeder Tool cuts typical bleeding procedures in half and is a more effective way to purge the brake system of air than other bleeding procedures. It takes only seconds to bleed a master on the bench. Bench Bleeding. Mark Simpson demonstrates how to syringe bleed a master cylinder using a kit from Master Power Brakes and high-quality DOT3 brake fluid. mount master cylinder into bench vise 3. 5 inches in diameter. I used a spring type clothes pin clamped on the master to hold the bleeder tubes submerged. After successfully rebuilding a master cylinder (or when fitting a new one) it is a good idea to bench bleed the MC before installing it in the car. Usually I have my wife at the peddle. Thanks in advance. Parts are just part of what we do. BRAKE MASTER CYLINDER BENCH BLEEDING INSTRUCTIONS 1. Learn more about your vehicle's master cylinder bleeder valve, heating system, brake system and more with tips from auto experts at Phoenix Systems. I am bleeding my master cylinder while installed in the car. I recently replaced the master cylinder on my '79SC. install bleeder tubes into the outlet ports to direct fluid back into the reservoir so the ends of the tubes will be under the level of the fluid 2. Watching for microscopic bubbles. Auto Repair Bench Bleeding A Master Cylinder. Yes it was bench bled. I am getting started doing a dual master cylinder install. The master cylinder should be bench bled before fitting to the braking system. Of course, no brake job is complete until the master cylinder has been taken care of. Here are the steps to pressure bench bleed a master cylinder:. The 1A Auto experts will show you how to safely purge air from your brake system by yourself. I was wondering since i installed the master cylinder in without bench bleeding it, the brakes used to be really good and for past two years it has been sitting and then i came back the brakes arent good anymore. Set your new Saturn Ion master cylinder in a bench vise; if you don't have a bench vise, you can use a clamp-on vise and an old table. How to Bench Bleed. A bench-mounted vise is the most important tool. The nuts that hold the master cylinder in place are larger and vary in size depending on the vehicle. Read about troubleshooting common problems and find the brake bleeder tools you need to get your car up and running as it should. When installing a new master cylinder it is often a good idea to "bench bleed" it before installing meaning you fill the reservoir with fluid, but the cylinder in a vice and bleed it to work fluid through it before attaching the hydraulic line. Check out this video to learn how to bleed your brakes and purge your own brake fluid if you have soft brakes or have replaced your brakes. 5L total brake fluid. I don't want brake fluid clean up under a customers hood. Note: Bench bleeding the master cylinder is VERY important! You CANNOT get all of the air out of the master cylinder by trying to bleed it in place. The New Process. e) With the master cylinder bench bled, it can be installed on the master cylinder and secured in place using the two nuts supplied with the booster. Fill it up, cover off. Set your new Saturn Ion master cylinder in a bench vise; if you don't have a bench vise, you can use a clamp-on vise and an old table. One of the most basic rebuilds on a 4x4 is a brake master cylinder. How to Bleed Your Clutch Hydraulics Without a Helper. the car is a rust free california car so I'm 99% sure the steel lines are ok. Then I started bleeding the brakes. This post is about my personal experience with fitting the D&D brake and master cylinder conversion kits on an early ford Econoline, it is not a guide and I take no responsibility for anything you learn here. The nuts that hold the master cylinder in place are larger and vary in size depending on the vehicle. There are many ways to bleed your 1967-1982 Corvette's brake system, today we are going to show you how to properly bench bleed a master cylinder and gravity bleed the entire brake system. Carefully horizontally mount the master cylinder in a vise, protecting the flanges from damage. The new rod is too short. master cylinder bench bleeding rather easy job 1. Master Cylinder in a vise and then use a dowel rod to press on the plunger to bleed the air out of the Master Cylinder. First clamp the master cylinder in a vise. I was wondering since i installed the master cylinder in without bench bleeding it, the brakes used to be really good and for past two years it has been sitting and then i came back the brakes arent good anymore. If the brake pedal holds constant pressure, without dropping, all is good. The master cylinder should be level. install bleeder tubes into the outlet ports to direct fluid back into the reservoir so the ends of the tubes will be under the level of the fluid 2. "Bench bleeding" seemed to make sense but it was not practical because when locating the master cylinder plus brake booster assembly back to it's place it had to be turned and twisted and turned in just one way to locate it right. No mess or fluid dripping when bench bleeding or when installing the unit on the vehicle. So I found a couple of youtube videos on bleeding the MC in the car and read several forums that say this works. If you don't have one or don't have a bench at all, you can buy a clamp-on vise that can be removed when you're done. However, if you depress the pedal and feel it's still mushy, or rock hard, it may mean the Master Cylinder is defective or full of air. Secure the M/C in a vise.