Question about 1979 Pontiac Firebird
Rear drum brakes lock up have replaced the proportioning valve, master cylendar and have bleed out all 4
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Posted on Jan 02, 2017
check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain
Posted on Sep 21, 2008
If main cable is snapped, you may get them to move for you by spraying cables where they go into backing plate, and give them a sharp/quick rap with a screwdriver handle or similar. I've got a way with that a few times. rap, rap, rap, rap repeat, and sometimes it will save restling with adjusters. I am curious though, if they weren't partially seized prior, they should have released when cable snapped.Get back to us if that doesn't work.
Posted on Dec 26, 2008
Obviously you have a bunch of badly rusted lines. Better they failed while you were working on them rather than driving down the road! Carefully inspect the remainder of the lines and if in similar condition to the ones that failed, you need to replace them. When finished and system is tight, then bleed out system. (check it twice to ensure all air is gone.)
Posted on Mar 19, 2009
SOURCE: bleed brakes but no pedal
Good! You bled the master cyl. before installation! The proper order of bleeding the lines, is to start with the wheel the greatest distance from the master cylinder. Then work your way to the next greatest distance, and last, the closest wheel. Make sure all air is removed from the lines before you proceed to the next wheel, and frequently check the master cyl. level, because, as I'm sure you know, if you **** in air at the master, you have to start all over again. I'm assuming you don't have a power bleeder, so with a helper do this with car running (make sure it's on safety stands and not going to fall on you!) Pump pedal 3 times, no need to mash the pedal into the floor, just 3 pumps 1/2 way down, hold 3rd pump at half way down level while bleeder is opened, when flow is about to stop at bleeder, close bleeder and repeat til no evidence of any air. Let me know how it goes and if you need any help.
Posted on Apr 21, 2009
check at the proportioning valve--some have a pin that sticks out from the side, when bleeding the brakes try to push that pin back in. But first check to see why this happened--fluid leak to rear wheels, brake hoses cracked and air getting into the system??????
Posted on Jun 12, 2009
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