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Thread: disc brakes

  1. #1

    disc brakes

    when you change from front drum brakes to disc brakes on a 68 camaro, is it necessary to change the master cylinder

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143
    YES. and lose the factory proportioning valve/distribution block.

    Drum brakes have residual valves either in the master or prop block that keep the fluid from being forced back toward master cylinder by the springs.

  3. #3

    disc brakes

    I did remove the prop block and that is what makes me wonder if a change in master cylinder is required . Is there a difference in masters from the factory between disc and drum that will help my stooping.

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Posts
    4,143

    Re: disc brakes

    Quote Originally Posted by camarotale
    I did remove the prop block and that is what makes me wonder if a change in master cylinder is required . Is there a difference in masters from the factory between disc and drum that will help my stooping.
    Disc brakes take more volume so you need to swap masters.
    I just changed my NOVA this fall. It is a 1970. I went to a Wilwood set up and used the adjustable prop valve. I first used a master for my year of Nova with disc /Drum. The pedal was hard as a rock. That master has a 1 1/8" bore. Wilwood said that was my problem. I have drums on back but I used a master from a 68-72 corvette with 4 wheel disc brakes. it has a 1" bore. I did not instal residual valves to the rear I just figured I would try it and see how it did...it stops great. NO PROBLEMS AT ALL. this is just an eighth mile bracket car with a big block.

    JMO

  5. #5
    Member JOURNEYMAN
    Join Date
    Jan 2008
    Location
    Newcomerstown, OH
    Posts
    33
    I just put manual discs on the front of my 72 chevelle. I used a master cyl. from a 69 vette disc/drum with a summit prop. valve to the rear. These brakes are awesome, the pedal is just right...not too soft, not too hard. Also have hurst roll control up front.

    I did most of my research on www.chevelles.com
    72 chevelle, tubbed. 350/TH350. Best [email protected] w/100hpNOS [email protected]
    67 Chevelle SS clone 396/TH400
    00 Silverado 1500 ext. cab long bed. daily driver/tow rig
    88 Camaro 305TBI
    81 Malibu Wagon 327/TH350


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