Yj Brakes Locked - Pirate4x4.Com : 4x4 and Off-Road Forum

102joe · 02-08-2008, 06:48 PM

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

hoki06 · 02-08-2008, 07:08 PM

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

jeffy · 02-08-2008, 07:26 PM

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.

gottagofast · 02-08-2008, 07:35 PM

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

102joe · 02-09-2008, 08:36 AM

THANKS Why Didn't I think of that I check it out right now .

102joe · 02-09-2008, 10:19 AM

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!

gottagofast · 02-09-2008, 07:15 PM

they released slowly over time as they cooled.... go drive it and get em warm and stuck... THEN release a bleeder

Binderman · 03-09-2009, 10:51 AM

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??

02-08-2008, 06:48 PM	#1 (permalink)
102joe Registered User Join Date: Jul 2007 Member # 94962 Location: castrovalley ca Posts: 24	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

02-08-2008, 07:08 PM	#2 (permalink)
hoki06 Registered User Join Date: Dec 2007 Member # 104183 Location: Winchester / Blacksburg, VA Posts: 50	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 __________________ 1990 YJ - SOA & 35s [url]www.novajeepers.com[/url] Last edited by hoki06; 02-08-2008 at 07:08 PM.

02-08-2008, 07:35 PM	#4 (permalink)
gottagofast Registered User Join Date: Apr 2003 Member # 19031 Location: louisville KY Posts: 1,078	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 __________________ Kevin [URL="http://www.pirate4x4.com/forum/showthread.php?t=567624"]My build thread[/URL] Killed the S-10 n2 jeeps now

02-09-2008, 07:15 PM	#7 (permalink)
gottagofast Registered User Join Date: Apr 2003 Member # 19031 Location: louisville KY Posts: 1,078	they released slowly over time as they cooled.... go drive it and get em warm and stuck... THEN release a bleeder __________________ Kevin [URL="http://www.pirate4x4.com/forum/showthread.php?t=567624"]My build thread[/URL] Killed the S-10 n2 jeeps now

03-09-2009, 10:51 AM	#8 (permalink)
Binderman Registered User Join Date: Nov 2003 Member # 24591 Location: Texas Posts: 305	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?? __________________ Rent this space!!

02-08-2008, 07:26 PM	#3 (permalink)
jeffy Registered User Join Date: Sep 2001 Member # 7102 Location: SF East Bay Posts: 132	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.

02-09-2008, 08:36 AM	#5 (permalink)
102joe Registered User Join Date: Jul 2007 Member # 94962 Location: castrovalley ca Posts: 24	THANKS Why Didn't I think of that I check it out right now .

02-09-2008, 10:19 AM	#6 (permalink)
102joe Registered User Join Date: Jul 2007 Member # 94962 Location: castrovalley ca Posts: 24	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!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode