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Hot Rods Power brake building pressure...

Discussion in 'The Hokey Ass Message Board' started by mack57, May 24, 2015.

  1. mack57
    Joined: Apr 17, 2013
    Posts: 176

    mack57
    Member

    Hi All,
    On to the next issue. '48 chevy coupe with orig drums converted to power brakes. The booster seems to build pressure as you use brakes and finally you have full brake.
    I made sure the pedal is coming "full off" the rod, vacc from manifold is steady.... What do you think is the issue?

    Thanks,
    Mack
     
  2. Ralphies54
    Joined: Dec 18, 2009
    Posts: 748

    Ralphies54
    Member

    Is the booster push rod coming off the master cylinder so the master returns to full return? Also use search function wealth of info there.
     
  3. fms427
    Joined: Nov 17, 2006
    Posts: 864

    fms427
    Member

    My first thought would be the master cyl pushrod is too long- not allowing mc pressure to be released. When booster( pedal) is released, compensating port in mc must be uncovered to release pressure. Shorten pushrod if it is adjustable or shim the mc off the booster .
     
  4. rocketsled59
    Joined: Mar 14, 2010
    Posts: 732

    rocketsled59
    Member

    Brake pedal should have a little free play in the released position. Adjust pushrod. Good luck!! RS59
     

  5. mack57
    Joined: Apr 17, 2013
    Posts: 176

    mack57
    Member

    Thanks All!!
     
  6. mack57
    Joined: Apr 17, 2013
    Posts: 176

    mack57
    Member

    Got it! Shimmed the MC. Great pedal & no pressure build up.
    THANKS!
     

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