Problem bleeding brakes

Discussion in 'Axles + Brakes' started by freeman35, Oct 23, 2018.

  1. freeman35

    freeman35 I'm Awesome

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    Sorry if this has been asked and answered..

    I have a 95 k1500 with 10bolt and 10inch drums.

    I just swapped out the rearend. I got the replacement out of 95 tahoe with 10bolt 11inch drums.

    I replaced wheel cylinders, shoes and drums.

    I'm attempting to bleed the rear brakes but I'm not getting any fluid or air coming out of bleeder valve.


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  2. east302

    east302 I'm Awesome

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    Maybe this will help. Is the brake warning light on? It almost sounds like the pressure differential valve has tripped, closing off the rear circuit.




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  3. freeman35

    freeman35 I'm Awesome

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    It is the pressure differential valve. I took the switch out and manually moved the valve.

    Every time I went to bleed the rear it moved back.

    If I moved the valve to center released the pressure in the front and gravity bled all 4 wheels do you think that would work?


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  4. east302

    east302 I'm Awesome

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    Do you have fluid at the rear port on the master cylinder? Just crack the line a little.

    The valve is held centered based on front and rear pressure, so (yes) I’d try sliding it to center and letting it gravity bleed at all four corners.

    Did you try holding that pin flush (not shoving it in, just keeping it from extending) while pumping the brakes?

    Or I’ve heard of people quickly stabbing the brake pedal and getting it to reset.




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  5. freeman35

    freeman35 I'm Awesome

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    So I ended up not having any luck keeping the valve centered. I tried everything even sticking a small screw driver in and holding the valve center while some pressed the brake in attempt to get fluid in the rear to build pressure. I figured I would just start taking the line apart at different points and figure out where the fluid was stopping

    I finally figured out the problem is the master cylinder. I took the lines off at the ABS MODULE and pressed the brakes and had fluid shoot out at the line supplying the front but nothing would come out from the line supplying the rear. So I was never getting fluid to the pressure differential valve in order to keep it centered.


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  6. east302

    east302 I'm Awesome

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    Glad you got it sorted out, thanks for updating.


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  7. freeman35

    freeman35 I'm Awesome

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    Thanks for your recommendation on helping me


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