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1999 GMC 3500 Pickup Question: brakes sticking back wheels

 

Question

kenmandoo, 7.4L V8, Magnolia, TX, October 21, 2009, 08:06
 Rookie

changed ..porportion valve & mastercylender checked rear hose(ruber)butafter pulling it off dosent look bad should i chang hose or am overlooking somthing? when i slam on the brakes back wheels stay tight untill i tap pedal again

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  • Answer #1

    backyard tech October 21, 2009, 08:56
     Master

    Not clear what you mean? Diconnect the emergency brake cables.

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  • Answer #2

    Gregarious October 27, 2009, 21:34
     Rookie

    This is not and answer but, I hope to clarify the issue. When coming to a stop, the rear drum brakes suddenly grab and lock up, will roll normally if released but, grab suddenly as in more than the brake pressure would account for.
    My pals truck is doing this, I am telling him that I want to put a new master cylinder in it. The problem reminds me of some car I read about that the brakes had to be bled a certain way or the proportioning valve would get stuck in the wrong place. I have found no special procedure reference about this truck.

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  • Medium-star Best Answer
    Visitor, July 06, 2010, 07:16

    After replacing the rear shoes on my 2000 K3500 the rear brakes lock up. Every 2000 miles I need to back off the adjusters

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