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what did I do wrong? still brake issue

Discussion in 'Wheels / Suspension / Tires / Brakes' started by red91efhatch, Feb 23, 2009.

  1. red91efhatch

    red91efhatch New Member

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    I know it's getting old me and my brakes.... but now i'm running into an issue where after driving the car from 10-20 minutes the pedal gets rock hard and all four wheels lock up. here's my setup where did I go wrong?Rear disc conversion from DA,Stock EF front calipers,DA non abs 40/40 prop valve,ef civic EX 15/16 bore master cylinder,brake booster ef civic EX, now I am planning on adding the DA front calipers anyone know what may be causing all four to lock up and pedal stiff? any advice is appreciated
     
  2. George777

    George777 ^^ Likes Bewbies

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    My Civic would sometimes do that. I narrowed it down to a vacuum problem.
     
  3. red91efhatch

    red91efhatch New Member

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    ok, care to elaborate? I have checked the check valve and seems to flow fine also
     
  4. George777

    George777 ^^ Likes Bewbies

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    It was a while ago, and I don't know what caused it exactly, but sometimes the pedal would just get stiff as hell. I could rev the motor a little bit and it would soften. We deduced it was a vacuum leak, because under higher rpm's it was fine, but once it got to an idle it would get hard again. I sold the car, so I never really looked into it more than that...
     
  5. ntenc1

    ntenc1 New Member

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    check valve on the brake booster is probrably letting air into the booster killing the vacuum which it operates off of when the car is sitting.
     
  6. 94H_Ex

    94H_Ex Under employed

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    yeah that little valve in your brake boosters vacuum line can cause that problem.
     
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