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Thread: brakes

  1. #1
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    brakes

    I'm thing about taking off the power brake booster on my 55 chevy because the pedal is hard and it will not lock up the brakes due to not enough vacuum. I have wildwood disc brakes front and rear and would like to hear from a few tri five owners with front and rear disc brakes and what size bore wildwood master cylinder yall are using and the rod location on the pedal for manual brakes or how the same 4 wheel disc brakes are working with the power brake setup. any help would be greatly appreciated.

  2. #2
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    That is why many guys with power steering use a hydra boost instead of a vacuum boost to assist brakes. I remember almost hitting my parents mailbox 40 years ago after installing a big cam in my 67 Camaro. Low vacuum really adversely affected what had been very good power brakes.

  3. #3
    Registered Member chevynut's Avatar
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    Why don't you try removing the booster and using your existing master cylinder first, to see if it works? What size bore does it have now? If you go with a smaller master cylinder bore, you're going to get more pedal travel. If you move the pivot down to get less pedal travel, it's going to take more force to stop. Brakes are kind of a balancing act.

    I would go with a Hydroboost and forget it. I sell adapters for them.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension


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  4. #4
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    I think you need to start with a 7/8" or 15/16" bore master cylinder. You need to go back to the stock pedal ratio if you have changed it. (That's the only natural way it goes together anyway.)

    Trying it without the booster but with the same master cylinder will be a waste of time. That's essentially what you have now.

  5. #5
    Registered Member chevynut's Avatar
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    I always thought that power brakes with a non-working booster made the brakes worse than without the booster. Not sure why that would be the case, but on some cars it's hard to push the pedal down at all. Or so it seems.
    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

  6. #6
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    It's pretty simple, pedal ratio and master cylinder size.

  7. #7
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    wouldn't want to go that route

  8. #8
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    wouldn't want to go that routwe

  9. #9
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    what is the ratio on a stock brake system

  10. #10
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    what is the ratio on a stock brake pedal

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