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Thread: Power brake booster

  1. #11
    Registered Member chevynut's Avatar
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    Nov 2011

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    Quote Originally Posted by dans55 View Post
    I thought the residual valve was built into the prop. valve.
    I thought it was in the master cylinder. If your prop valve has the residual valve, I'd say you're good to go there.

    What size bore does the MC have? What disc calipers are you using? Have you adjusted the rear brakes correctly?

    Seems to me you don't have enough fluid in the MC to actuate the brakes as they are. That's either because you have too small of a MC bore, too big brake calipers, or mis-adjusted rear brake shoes.

    Do the brakes pump up?
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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  2. #12
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    If you have the "Chevelle" type combination valve for disc/drum (the one most sell), it should have a residual valve in the rear brake line outlet.

    The residual valve shouldn't make a whole lot of difference on a new installation with proper adjustment.

    Did you check the pushrod as Cnut suggested? If it's preloaded (too long), you can't properly bleed the air out, and air seems to be your problem.

    Check the pushrod and the troubleshooting charts, then post back.

  3. #13
    Registered Member chevynut's Avatar
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    Here's what I would do, in this order:

    First, check to make sure your pedal pushrod is adjusted correctly with just a little free play.
    Next, remove the master cylinder and make sure the pushrod is the correct length.
    Adjust the rear brake shoes.
    Bleed the brakes again to be sure all the air is out.

    If that doesn't make it better, you probably have too small of a master cylinder bore. You still haven't told us how big the master cylinder is and which calipers you're using. Are you using the stock rearend with stock brakes?
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1962 327/340HP Corvette
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax
    2019 GMC Sierra Denali Duramax

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