Correct 1970 Disc Brake Master Cylinder

Discussion in 'The whoa and the sway.' started by LARRY70GS, Oct 19, 2021.

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  1. Frankie70GS

    Frankie70GS Long Island NY

    Yes. Has bleeders. I am told that it is also the same as a 70 vette
     
    Frankie70GS, Oct 23, 2021
    #21
  2. Mart

    Mart Gold level member

    The 1st pic looks like my original drum/drum,
    except I had bleeders. The 2nd looks like my Corvette disc/disc that's 1-1/8" or 1-1/16"bore.
    I bought a disc /disc 1" bore to try.
     

    Attached Files:

    Mart, Oct 23, 2021
    #22
    Frankie70GS likes this.
  3. Frankie70GS

    Frankie70GS Long Island NY

    Yes 1 1/8" bore.
     
    Frankie70GS, Oct 23, 2021
    #23
  4. Frankie70GS

    Frankie70GS Long Island NY

    What I am curious about. Is there a difference in the brake pedal rod. Between drum and disc? Somehow I feel that 1/2" or so might make a difference.
     
    Frankie70GS, Oct 23, 2021
    #24
  5. Frankie70GS

    Frankie70GS Long Island NY

    I got this correct master cylinder from Steve Caruso in Michigan. Came to my door in 3 days. At a very good price. Highly recommended.
     

    Attached Files:

    Frankie70GS, Oct 23, 2021
    #25
  6. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    If you still have the 70 distribution block on the frame, you will need to change it to a 71 and newer, or add a hold off valve at the master cylinder….which is what the 70 Buicks had when it was a disc/drum setup
     
    Smartin, Oct 23, 2021
    #26
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    No, that is what the 1970 Disc/Drum master looks like, and the Corvette MC looks the same, but some are Disc/Disc. Frankie's MC came from Steve Caruso, so it's the right one.

    http://www.carusoperformance.com/brake_parts.html
     
    LARRY70GS, Oct 24, 2021
    #27
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Some of the power booster rods (under the dash) are threaded with a nut that is adjustable. You can raise the brake pedal a bit and that improves feel. I have a replacement brake booster that has that rod/nut. I have always felt the stock pedal height is too low.

    BrakeBoosterRod.JPG
     
    Last edited: Oct 24, 2021
    LARRY70GS, Oct 24, 2021
    #28
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    LARRY70GS, Oct 24, 2021
    #29
    Frankie70GS and Smartin like this.
  10. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    Thanks Larry. I was sitting on the couch eating cheesy poofs when I typed the response:D
     
    Smartin, Oct 24, 2021
    #30
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    :D:D Are your fingers orange?
     
    Last edited: Oct 24, 2021
    LARRY70GS, Oct 24, 2021
    #31
  12. pbr400

    pbr400 68GS400

    I remember a certain chemistry teacher who said sonething about that not being ‘plans’…

    Patrick
     
    pbr400, Oct 24, 2021
    #32
  13. Frankie70GS

    Frankie70GS Long Island NY

    Thanks Larry. My brother said the same kind of thing. He's a Chevy guy (who lives in Pennsylvania now and he's never actually seen the car).
    so he didn't know what to call it. Hold off valve. Cool. He also told me a trick to make sure that your brake booster is working which I didn't know. Start the engine with your foot on the brake pedal. It should go down somewhat. This means that your brake booster is drawing vacum. (working).
     
    Frankie70GS, Oct 25, 2021
    #33
  14. steve murray

    steve murray Well-Known Member

    How much are the “correct” 70 disc/ drum masters from Caruso ?
     
    steve murray, Dec 3, 2021
    #34
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