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Thread: brake master cylinder

  1. #1

    Default brake master cylinder

    We have a retired brush truck for our town that is a M715. Our union owns it, Hasn't ran in a while and they nominated me to get it running again. I got it to turn over and run with starting fluid but it seems the brake master is just toast? I would like to replace with the original but I see some posts with upgrades.

    Thoughts?

  2. #2
    Join Date
    Apr 2016
    Location
    Katy, TX
    Posts
    279

    Default

    Is the vacuum boost shot or the master cylinder?

    I just did a upgrade from vacuum to hydroboost on my 69 Wagoneer and am super happy

    Used this guy.


    http://www.custompowerbrake.com/

  3. #3
    Join Date
    Dec 2003
    Location
    Giddings, Texas
    Posts
    7,729

    Default

    Welcome to the Zone.

    The fuel system from the sock inside the tank, fuel pump and carb probably all need to be looked at and cleaned up.

    The stock brake system works very well. Since this isn't your truck. Putting a stock replacement master cylinder on there might be the best route to take. Be warned that you will probably end up doing all 4 wheel cylinders as well.
    Remember if you didn't build it you can't call it yours.

    6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.

    https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw

  4. #4

    Default

    If the master cylinder is bad, then the wheel cylinders are probably also corroded. Get new master and wheel cylinders. I would go with the dual reservoir conversion using the corvette master cylinder as it works great without power assist. The original is a single reservoir. If the shoes are good and drums not tore up you can probably get away without having them turned.

  5. #5

    Default

    The decision to have these drums turned is one that shouldn't be taken lightly given their rarity, IMHO. Most every attempt I've seen made at turning a brake drum has ruined them through incompetence.

  6. #6
    Join Date
    Jul 2009
    Location
    Louisville, KY
    Posts
    1,041

    Default

    I did the corvette master and E350 wheel cylinder, have not had a problem since installed 10 yrs ago.
    Thanks for all the help!

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