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What could be wrong with my brakes?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 80K5, Nov 19, 2001.

  1. 80K5

    80K5 1/2 ton status

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    Whenever I put my brakes on and hold them on for a little bit they lose pressure and I am able to press the brake petal all the way to the floor. The lines aren't leaking and the master cylinder doesn't leak and is full of brake fluid. Does anyone know what the problem could be?

    Stuck? Isn't that a bird!
    Steve
     
  2. 1979Jimmy

    1979Jimmy 1/2 ton status

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    Just a wild ass guess here but maybe there is gas building up underneath the bad when you apply the brake lifting the pad a little.

    79 Jimmy, 5" lift 35 M/T with a 383 puttin out 400hp and 450lb/ft. Locked front and back.
     
  3. BobK

    BobK 1/2 ton status

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    I think that's a sign of a leaky booster.If you have one of those Mighty-Vac vacume pumps attach it to the booster and see if it will hold the vacume you apply with the hand pump.

    <font color=green>BobK<font color=green>
     
  4. jimmyjack

    jimmyjack 1/2 ton status

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    I'd be willing to put a few dollars on a bad cylinder somewhere. A bad booster just makes the pedal super hard and the brakes don't work. You could have a torn seal on the master cylinder or one of your rear cylinders is toast.

    That jeep thing? Yah I understand it....... Like my Blazer? <a target="_blank" href=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</a>
    Jim
     
  5. slider79blazer

    slider79blazer 1/2 ton status

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    check the vacuum line going to the booster look for cracks or rotting. also the plastic valve in the booster that the vacuum line hooks to might be cracked.

    <font color=blue>whats a 4 letter word for farm wagon?-- ford</font color=blue> [​IMG]

    <a target="_blank" href=http://community.webshots.com/user/slider79blazer>http://community.webshots.com/user/slider79blazer</a>
     
  6. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    I had a bad booster a few months back, but it made the brakes really hard. Pull the vacuum line off the booster, then try stopping the truck.

    Mud...
     
  7. moneypit

    moneypit 1/2 ton status

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    Bad Master Cylinder.
     
  8. Triaged

    Triaged 1/2 ton status

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    Bad master cylinder...
    That is the only thing that can be a "internal" leak (it can leak back into the res. or get sucked into the booster vac. line...either way you won't see it.).

    '71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
    <a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>
     

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