Question about 1986 Ford F 250

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I installed a master cylinder on a 1990 Aerostar van. The instructions that came with the part said not to bench bleed, it may cause leaks. I bleed it on the vehicle with the bleed screw on the master cylinder and I still have air. What do I need to do?

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Bleed it from wheel to wheel the one fartest from the cylinder andworking away around till yo are at the closest, you need a quart of dot 3 brake flid to do it and two people to do it, pump the pedal three times ad release the cylider valve and do so til yo get clear brake fluid do this which each wheel and keep filling the master cylinder, do this twice if it's working the pedal will keep rasing. if the pedal becomes sollid and still not all the way up then adjust the rear brake start wheels where te wheels barely touch the drums, aslo there is a compensating valve on the rear axle remove the nutthat holds it to the bed and open it wide open and continue to bleed, that should fix you up.

Posted on Jun 21, 2009

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1 Answer

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First, you have to bleed the master cylinder on the bench before you install it, or else it will have air it that will be very difficult to purge. Almost all rebuilt M/Cs have an instruction page inside the box that goes about explaining the bench bleed procedure. You make lines that feed from the outlets back into the reservoir and work the piston until all air is purged from the M/C. Then, after installing the M/C, you can bleed the individual brake lines in the normal manner. See this youtube video for assistance...


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What is the condition of both front calipers? both rear wheel cylinders? and the complete brake lines and hoses of your van? If they are all good with no traces of leakage, then did you bleed the Mastercylinder on the bench first before installing in the van? Did you gravity bleed the 4 wheels first? did you bleed from the farthest wheel first? Are you using a new Master and not a re-built??

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What needs to be done after replacing front brake pads on a 2005 s60 if the pedal goes to the floor? They were bleed after the new pads were installed.


The liquids does not compress, so there is no reason for the brake pedal to go to the floor. If you have no brake pressure, after bleeding the system, then the master cylinder is wasted. The brake master cylinder leak might be Internal, or External. Check around the master cylinder for any external leak. The break fluid is an excellent paint eater, so clean any leak before you remove the Master Cylinder. The new Master Cylinder needs a bench bleeding process, before installed in your car.

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?. Did you bench bleed all of the air out of the 2 master cylinders before installing on your vehicle, it sounds like that it has air in the sysytem, try bleeding the cltch master cylinder and the bleed off the slave cylinder, that should put you on par.

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This means that you either still have a leak, or there is still air in the line. Be sure that you bleed a lot for a master cylinder change out. Also if the bench bleed was not preformed then there will be a tremendous amount of air in the system. A bench bleed is simply filling the master cylinder and priming it before you install it. Hope this helps. Good luck.

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First You Bench Bleed The Master Cylinder Before Installation. Use The Provided Plugs Given With The New Master. Use Screw Driver And In And Out Motion You Bleed Until No Bubbles. Then After Installation, Crack Line And Have Buddy Slowly Push Down On Pedal. Close Line. Repeat To Other Line. You're Done

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Just replaced master cylinder on 1990 aerostar and bled the brakes, still the pedal goes to floor and i have no brakes


Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.

Apr 29, 2009 | 1986 Ford F 250

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