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Old 02-08-2008, 06:48 PM   #1 (permalink)
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Question Yj Brakes Locked

What the hell would cause both front calipers to lock up?????????????? I Don't think they could both go bad at the same time !!could the proportion valve have something to do with it? Help please I have never even herd of this happening before
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Old 02-08-2008, 07:08 PM   #2 (permalink)
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i had both front calipers seize up within one weekend. i replaced both and haven't have a problem since. i figured since they were 17 years old that age may have been the issue, not sure though
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Old 02-08-2008, 07:26 PM   #3 (permalink)
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I've had one lock up and a week or so later the other one locked up. Made driving home interesting. Pounded them off the calipers as soon as I could so they wouldn't freeze in place and be a bigger PITA to remove.

Could be a lot of things. Warn caliper seals or crud in the lines. My calipers were originals from 1992 and it was early 2000's when they froze up. Luckily remans are dirt cheap. I think they were around $15 each. Haven't has a problem since.

Be careful taking the caliper bolts out they are a bit fragile and are a PITA to locate since they are metric graded bolts.
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Old 02-08-2008, 07:35 PM   #4 (permalink)
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really easy to tell..... when they are locked... crack a bleeder... if they both instantly free up then it's not the calipers. if they don't, it is
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Old 02-09-2008, 08:36 AM   #5 (permalink)
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THANKS Why Didn't I think of that I check it out right now .
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Old 02-09-2008, 10:19 AM   #6 (permalink)
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Wtf Now I Go To Check The Calipers And I Find That They Have Released On There Own Does Any One Know How The Proportion Valve Works ? Or Could The Master Cylinder Be Hanging Up ? Help!
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Old 02-09-2008, 07:15 PM   #7 (permalink)
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they released slowly over time as they cooled.... go drive it and get em warm and stuck... THEN release a bleeder
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Old 03-09-2009, 10:51 AM   #8 (permalink)
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Any recent findings on this issue?? I had the same problem this morning, again.

I am starting to think I have a bad master cylinder. I know it shouldnt hold pressure, but when the calipers are locked and I bleed the line at the MC the calipers release. The master was NEW (not rebuilt) a month ago.

Still I am having a problem blaming the MC as it only pushes fluid. IIRC there arent any checks in a MC that would cause this problem is there??

I shot both rotors with my IR gun and the passenger side was 280* and the drivers side was 204* so I may still have problems in the passenger side??

I overhauled the pass side caliper just a couple days after the MC was replaced when the locked brake issue first happened.

Will one sticking caliper cause pressure to build so as to lock the other one?

I'm at a loss now!!

What say ye??
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