Sierra left side brakes locking up - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-28-2013, 08:57 AM   #11
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only other thing i can think of and its a guess, is some cars have anti drainback devices in the lines they might have an issue
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Old 01-29-2013, 03:57 PM   #12
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i was thinking maybe a bad booster, maybe a master cylinder or a poportioning valve
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Old 01-29-2013, 08:47 PM   #13
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The master cylinder separtes them: Im pretty sure the brakes are front and rear separted so it would not affect one side. The porpotioning valve is internal to the abs motor.
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Old 01-30-2013, 07:37 PM   #14
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i just cant figure anything else out. It sucks cause the truck will sit for a little bit and once the pressure goes down theyre fine until it builds enough pressure again
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Old 02-05-2013, 10:30 PM   #15
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anyone?
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Old 02-06-2013, 08:23 AM   #16
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Did you try pulling the abs fuse and see if it makes a difference?
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Old 02-06-2013, 08:45 AM   #17
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no i did not, thats a good idea
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Old 02-06-2013, 12:09 PM   #18
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i unbolted my master today after the pressure built up and that didnt make a difference, so then I tried the abs fuse, still noting. I'm stuck at this point
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Old 02-06-2013, 10:37 PM   #19
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Leave the fuse out and after the pressure goes back. Drive it and see if anything changes.
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Old 02-06-2013, 11:04 PM   #20
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gotcha, ill try
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