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Old 04-12-2024, 09:47 AM   #4
Old 403
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Join Date: Dec 2009
Location: Sask. Canada
Posts: 5
Re: Hydroboost on 81

Quote:
Originally Posted by mongocanfly View Post
The hydroboost has no effect on which wheels stop when mashing the pedal... sounds like maybe your master is bad...have you tried bleeding rear brakes? Also on the proportioning valve, it has the trip feature, meaning the internal spool can trip and send all the fluid to front or back....check and make sure it isn't tripped..mine was one time and all I had was rear brakes.. they make a tool to screw into it to hold the spool centered so you can bleed the system..
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How do you check that proportioning valve? Another thing I've been advised is maybe the rear shoes need setting up. This truck, for some reason does not have the slot openings in the backing plate to allow shoe adjustment. Do I have to cut openings there to get in with an adjuster? When the rear drums are off the cylinders and shoes all look good. No signs of leaks or worn out shoes.
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