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'74 GMC 1 ton truck front calipers not releasin
Posted by Andrew on February 22, 2007 at 13:20:21 from (18.104.22.168):
Replaced the master cylinder, calipers, shoes and had the booster pack rebuilt! Front calipers wont release after all that work. To release the calipers I have to loosen the bleed valves then the truck rolls fine. I have blead the lines with the truck running (front and back) till no air comes out.
I've piddeled with alot of stuff mechanicaly, but I'm at my experienced end here.
What is wrong?
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