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Thread: front brakes dont release

  1. #1
    Senior Member RACING JUNKIE
    Join Date
    Mar 2008
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    falkville al
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    1,766

    front brakes dont release

    53 ford wagon, power brakes, disc up front drum on back.when i hit the brakes the front wont release, unless i crack open the bleeder screws or wack it a couble of times with the hammer.its a ford set up up front s10 in the rear.replaced both calipers, brake hoses, steel line from the proportioning valve to the t block that feeds the front wheels,mastercyl. i checked push rod lenght also. we did find that the m.c. piston touched the pushrod before the m. c. seated on the booster. so we anded a couple washers on the studs that the m. c. goes on and that made that right. BUT it still wont release. i can pump the brakes get out and open the m.c. and watch the fluid shoot up out of the bowl about a inch high for a minute.even after it does that the pressure is still there.the back dosent seem to be locking up just front. HELP PLEASE. KEN

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    RESIDUAL VALVE IN MC?
    Mine were just doing this with my Wilwood stuff...after I blead them good it seemed to help. If that MC was not made for disc brakes it will have a residual valve in it that keeps preasure on the drum brakes to keep the springs from forcing fluid back to MC...you probably already know that.. :? just a thought in case you hadn't thought about that...that or MC is junk.

  3. #3
    Administrator RACING JUNKIE bjuice's Avatar
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    Apr 2003
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    Greenville s.c.
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    3,239
    i had the same problems several years ago when i converted drum to disc ( front brakes) on my 69 camaro. i ordered a master cylinder set up with an attached disc/drum residual/proportional ..solved my problems.

    i am trying to think of the company..i know they were from California and 55/57 chevys were their main service line..

    i will think of it and post if it comes to mind.
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  4. #4
    Administrator RACING JUNKIE bjuice's Avatar
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    Apr 2003
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    Greenville s.c.
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    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "


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