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Brake Bleeding on my 1979 gmc

Discussion in 'Chevy Trucks' started by illday, May 30, 2004.

  1. illday

    illday Junior Member
    from RI
    Messages: 9

    The new starter did the trick (thanks to ya'll for helping me troubleshoot that problem. Here's the latest issue my truck.

    Throughout the day I could feel air in my brakelines. By
    the end of the day I had no brakes. Checked my fluid and it
    was low, so I filled it. Figured the next step would be to bleed my
    brakes. I'll spray the bleeder with wd40 tonight and bleed them
    in the morning. I got confused when the rear tires each had
    bleeders. Does this sound rite? I'll admit it, I'm a rookie when
    it comes to brakes. This is the first time I bled the brakes.
    This old truck has paid for itself a thousand times over and I
    want to keep it on the road for another 25 years.
    Any tips on this would be helpful.
    Last edited: May 30, 2004
  2. wfd44

    wfd44 Senior Member
    from Maine
    Messages: 369

    Each wheel cylinder will have a bleeder screw. Start at the wheel furthest from the master cylinder (right rear) and progressively closer to the master until you finish with the left front.
  3. illday

    illday Junior Member
    from RI
    Messages: 9

    Bled the brakes and still no brakes. Is it possible that old fluid
    could cause a complete Brakes loss.
    Here's what is happening...
    My brakes pump up when the
    truck isn't running and go straight to the floor as soon as I start
    the engine and won't pump at all with the engine running.
    Any suggestions would be helpful.
  4. towman

    towman Member
    Messages: 39

    sounds like you need a master cylinder
  5. ratplow408

    ratplow408 Member
    from PA
    Messages: 33

    Look for fluid in cab or fire wall.
  6. jrm123180

    jrm123180 Senior Member
    Messages: 156

    Master cylinders are cheap...I think I paid like $15-20 at autozone for one for my 79 chevy K10 and I believe that has a lifetime warranty. If yours is original, i would just replace it, regardless, for that price.

    POWERBAND Member
    Messages: 70

    Brakes broke

    Chevys of that era can be a bear to bleed, especially for a novice. The proportioning/safety valve will shut off the rear circuit if you crack the rear bleeders to respond to a "fault" lack of pressure. Also if the MC has been pumped dry it will take a "bench bleed" or close to it on the truck before you can start with the wheel cylinders.

    I don't want to discourage anyone trying to learn but please try to get someone who's been there done that to show you instead of a frustrating exercise. You could also try a FSM or decent aftermarket book to learn the procedure. YOu can do it and it is easier after the first dozen times or so.

    PB :cool:
    Last edited: Nov 16, 2004