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'74 GMC 1 ton truck front calipers not releasin


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Posted by Andrew on February 22, 2007 at 13:20:21 from (199.5.204.100):

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.
It all started when the pedal went to the floor because of a bad master cylinder (internal leak). After replacing the master cylinder the break pedal wouldn't move and when I pressed it the truck would stop very quickly and nearly throw me against the steering wheel. As I piddeled with the calipers they started locking up, so I thought I'd replace them. That didn't do any good, so I had the booster pack rebuilt and still have the same problem. All of the air is out of the steering system lines that power the booster pack, and the break lines have been purged very well.

I've piddeled with alot of stuff mechanicaly, but I'm at my experienced end here.

What is wrong?


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