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k30 breaks going out........

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84CUCV, May 16, 2004.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Pit in fliud. Good pedel for a short time and then the they right back down to the floor. Cant finf any wet or leacking spots anyware. What else could it be?

    thanks mike
     
  2. Ben

    Ben Registered Member

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    Get on the ground and look behind each wheel... look for signs of a leaking brake wheel cylinder or brake caliper. If none, it's the master cylinder that needs replacing.
    If you are having to add brake fluid, you have a leak somewhere.
     
  3. unclematty

    unclematty 1/2 ton status

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    if theres no leaks it has to be a bad master cylnder /forums/images/graemlins/waytogo.gif
     
  4. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    looked all aver the truck and didnt find a leaks. Will check one more time. So looks like my master cylnder is shot. how do they go? thanks mike
     
  5. trikstark5

    trikstark5 1/2 ton status

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    Check to see if there are bubbles appearing in the master cylinder while you are applying the brakes. It could be a bad power booster. I just had the same problem and it ended up being a power booster. Good Luck!!!!
     
  6. Muddytazz

    Muddytazz 1 ton status

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    if it were the brake booster, the brake pedal would be harder than hell to even push at all. Usually worse than manual brakes.
     
  7. spearchucker

    spearchucker 1/2 ton status

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    There has to be a leak somewhere. Where else would the fluid go? /forums/images/graemlins/dunno.gif ... It doesn't evaporate too well. /forums/images/graemlins/doah.gif
     
  8. Ben

    Ben Registered Member

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    [ QUOTE ]
    There has to be a leak somewhere. Where else would the fluid go? /forums/images/graemlins/dunno.gif ... It doesn't evaporate too well. /forums/images/graemlins/doah.gif

    [/ QUOTE ]
    If the master is leaking, the fluid would be seeping out between the MC and the brake booster and or into the brake booster. Unless the proportioning valve is leaking....
    but I'm willing to bet your life that the master cylinder is leaking!
    Just replace it and be done with it and on the road again!
     
  9. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Will see how it goes. thanks
     

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