Correct 1970 Disc Brake Master Cylinder

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

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  1. LARRY70GS

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

    Is there a source for the correct MC? Didn't some Corvettes use that same Master? I remember Then and Now under Mark Reeves selling the correct one back a ways.
     
    LARRY70GS, Oct 19, 2021
    #1
  2. LARRY70GS

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

    LARRY70GS, Oct 19, 2021
    #2
  3. Quick Buick

    Quick Buick Arlington Wa

    ACDELCO 18m72. 1 1/8 is the recommended bore for power assist brakes. disk/drum... I personally hate the corvette 2 bail units... I prefer since bail..
     
    Last edited: Oct 19, 2021
    Quick Buick, Oct 19, 2021
    #3
    1968_GS400 and Frankie70GS like this.
  4. Frankie70GS

    Frankie70GS Long Island NY

    I have this very issue. I only have this car about 1 month. I was concerned about the excessive brake pedal travel. The car has an aftermarket front disc brake kit and factory rear drums. All look very new including new wheel cylinders in the rear. The first thing I did was bleed out all four wheels. It didn't really make a difference in the travel, but it gave me a little peace of mind. I went to a local car show and a very knowledgeable Buick guy knew right away, that I had a 4wheel drum brakes master cylinder and that is probably my issue. I got an old school parts store to find me a Wagner #. It's MC10125Y. But no stock anywhere that he knew.
     
    Frankie70GS, Oct 19, 2021
    #4
  5. CJay

    CJay Supercar owner Staff Member

    How "correct" do you want? And what are you willing to pay?
     
    CJay, Oct 19, 2021
    #5
    1968_GS400 and Brett Slater like this.
  6. Frankie70GS

    Frankie70GS Long Island NY

    This is what I have. If it came out. What would I be willing to pay? Anything within reason. I have really no idea. But I definitely need to get one.
     

    Attached Files:

    Frankie70GS, Oct 19, 2021
    #6
  7. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    Frankie, that is a nearly correct drum drum master. Original had bleeders.
     
    Smartin, Oct 19, 2021
    #7
    Frankie70GS likes this.
  8. CJay

    CJay Supercar owner Staff Member

    Bring it to apple hydraulics in Calverton. $250 to sleeve and rebuild it
     
    CJay, Oct 19, 2021
    #8
  9. LARRY70GS

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

    LARRY70GS, Oct 19, 2021
    #9
    Frankie70GS likes this.
  10. gsfred

    gsfred Founders Club Member

    Got a brand new one that I bought from someone on the board. It is a repro.
     
    gsfred, Oct 19, 2021
    #10
  11. CJay

    CJay Supercar owner Staff Member

    So a repro is good enough then?
     
    CJay, Oct 19, 2021
    #11
  12. LARRY70GS

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

    Oh yeah. If you showed up at Bellmore Friday, you would have met Frankie and his car.:)
     
    LARRY70GS, Oct 19, 2021
    #12
  13. Frankie70GS

    Frankie70GS Long Island NY

    Ill be there this Friday weather permitting
     
    Frankie70GS, Oct 19, 2021
    #13
  14. CJay

    CJay Supercar owner Staff Member

    I'll be there as well. Look for the yellow GSX
     
    CJay, Oct 19, 2021
    #14
    Frankie70GS likes this.
  15. Frankie70GS

    Frankie70GS Long Island NY

    Nice! See you there
     
    Frankie70GS, Oct 19, 2021
    #15
  16. Dano

    Dano Platinum Level Contributor

    I've got a repro I'd sell.
    Whatcha got wrt a correct one for a '70 Jason?
     
    Dano, Oct 20, 2021
    #16
  17. Frankie70GS

    Frankie70GS Long Island NY

    Before... Screenshot_20211023-195937_Gallery.jpg
     

    Attached Files:

    Frankie70GS, Oct 23, 2021
    #17
  18. Frankie70GS

    Frankie70GS Long Island NY

    And correct. Screenshot_20211023-195751_Gallery.jpg
     
    Frankie70GS, Oct 23, 2021
    #18
    Dano likes this.
  19. Mart

    Mart Gold level member

    Isn't that a Corvette disc/disc?
    Got bleeders?
     
    Mart, Oct 23, 2021
    #19
    Frankie70GS likes this.
  20. Frankie70GS

    Frankie70GS Long Island NY

    If you look closely, you can see that the correct master cylinder is very much larger than what was on my car. The former probably came with whatever front disc brake kit that some former owner had installed. But you can see the difference. Thank you Bruno and Larry for steering (braking) me straight!
     
    Frankie70GS, Oct 23, 2021
    #20
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