Question about 1996 GMC Jimmy

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I have a 1996 GMC c2500. It had both rear wheel cyl. leaking and I replaced them. When I tried to bleed them I have no fluid to the rear. I checked at the master cyl and I do have flow there,but there is no flow from the unit in front of the master cyl where all the lines enter and exit. Front brakes are fine! I replaced both wheel cyl,new shoes and new axle seals.

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  • homer nichols Oct 05, 2010

    I took the line off before the flex hose on the rear and at the unit infront no fluid from unit . The wheel cyls seem to have been leaking for a long time. Is the mixer the unit Im refering to at the front of the m/c?

  • homer nichols Oct 05, 2010

    I have checked for flow all the way to the front. No fluid is coming from the unit where the lines go from the m/c

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  • Master
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I take it you are trying to bleed the rear brakes and are not getting any fluid. When you are not getting any fluid to the rear only. It can only be two things. The per portioning valve. This is what supplies the brakes on the rear with only 10% breaking.

Posted on Oct 05, 2010

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  • GMC Master
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I would try to crack the line open at the flex line on the slave cylinder on the caliper or drum,, whichever you have, check for fluids there, if not, go up to the next joint, try it there, where the flex line meets the hard line, any luck? If not, I don't know why it was leaking out but won't pump out, chevy's are famous for the flex lines going bad, but not 2 at the same time, It must be in the mixer up front, But you said you cracked them open. Then how about the rear anti lock brake system? Did the light come on? How about checking the bleeder screw, take it all the way out and see if it has a hole in it, check the cylinder, does it have a hole in it? Check the anti lock brake fuse, I don't know what good it will do, but I would check everything. Hope this helps.

Posted on Oct 05, 2010

  • Ned  White
    Ned White Oct 05, 2010

    Yes it is, You said it was working there or no? If it is not pumping from the front, how did it leak? I would get that mixer thing checked out, it has to do with anti lock brakes if you have them, You should have about 10 lines coming out of that thing. A bunch of them go to the anti lock pump , I have read about them going bad and being replaced and I always thought , that must be a job. You have a breaker in the fuse box up front for the anti lock brakes, If you have them, i don't even know if you do. most cars and trucks had them in 1990 at least. Check it out.

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