Caliper pistons sticking/not releasing - JeepForum.com
 9Likes
Reply
 
LinkBack Thread Tools
post #1 of 23 Old 04-04-2020, 08:42 AM Thread Starter
wjkeith
Registered User
 
wjkeith's Avatar
 
Join Date: Aug 2018
Posts: 213
Garage
Caliper pistons sticking/not releasing

I’m having an issue with my right front caliper. The pistons aren’t releasing. I’ve replaced it and after a short drive today I think it’s still an issue. I visually inspected the flexible brake hose and it appears to be ok. Can these fail from the inside out? It’s the only thing I can think of that would allow fluid to travel backwards.
Also, the pistons on the older caliper couldn’t be pressed back in even when I tried to do it with my bench vice. Never saw such a thing.


Last edited by wjkeith; 04-04-2020 at 08:44 AM. Reason: Additional info
wjkeith is offline  
Sponsored Links
Advertisement
 
post #2 of 23 Old 04-04-2020, 09:19 AM
riverzj
Registered User
 
Join Date: May 2018
Posts: 151
Did you grease the slide pins good?


Sent from my iPhone using Tapatalk
riverzj is offline  
post #3 of 23 Old 04-04-2020, 09:20 AM
Bigrigr
Registered User
 
Bigrigr's Avatar
2000 WJ 
 
Join Date: Jan 2020
Location: Near SLC
Posts: 863
Garage
It is possible to have the inner lining in the brake hose peel away and block the flow of fluid back to the master cylinder. This almost always creates excessive drag when spinning the wheel in the air. It's also very possible for the caliper pistons to seize in the caliper bore creating faster wear on the brake pads over the other side that is releasing. This can make it hard to compress the piston to reset it for new pads. If i had either of these issues i would be replacing the calipers first, and always change the calipers in pairs. Both sides have the same mileage, and if one has failed the other is probably not far behind. Calipers failing is very common these days, and the failed hose much less common, but if you want to be sure, change both calipers and both hoses at the same time. It wouldn't be unreasonable now that these Jeeps are 20 years old
riverzj and Wabatuckian like this.

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,4" short arm lift,JK'sW/32's
Bigrigr is offline  
 
post #4 of 23 Old 04-04-2020, 09:44 AM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 1,666
hoses on wj look like A REAL REAL JOB. if you can get at them...

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #5 of 23 Old 04-04-2020, 10:54 AM
xcaliber81
Registered User
 
xcaliber81's Avatar
2004 WJ 
 
Join Date: Jul 2012
Location: Prince George
Posts: 4,966
Quote:
Originally Posted by 2oldjeeps View Post
hoses on wj look like A REAL REAL JOB. if you can get at them...
Try taking the heater core hoses off your firewall on the 4.7 1 handed that's a real pita.
jtpeters and 2oldjeeps like this.
xcaliber81 is offline  
post #6 of 23 Old 04-04-2020, 12:21 PM Thread Starter
wjkeith
Registered User
 
wjkeith's Avatar
 
Join Date: Aug 2018
Posts: 213
Garage
Quote:
Originally Posted by Bigrigr View Post
It is possible to have the inner lining in the brake hose peel away and block the flow of fluid back to the master cylinder. This almost always creates excessive drag when spinning the wheel in the air. It's also very possible for the caliper pistons to seize in the caliper bore creating faster wear on the brake pads over the other side that is releasing. This can make it hard to compress the piston to reset it for new pads. If i had either of these issues i would be replacing the calipers first, and always change the calipers in pairs. Both sides have the same mileage, and if one has failed the other is probably not far behind. Calipers failing is very common these days, and the failed hose much less common, but if you want to be sure, change both calipers and both hoses at the same time. It wouldn't be unreasonable now that these Jeeps are 20 years old
18 months ago I replaced calipers, pads and rotors. Iím of the same school of thought when it comes to replacing 20 year old parts. Change all related components if possible. The calipers are recons from AutoZone. Maybe got a crap pair?
wjkeith is offline  
post #7 of 23 Old 04-04-2020, 11:49 PM
BigMateo
Junior Member
2004 WJ 
 
Join Date: Aug 2018
Posts: 53
The passenger side front brake seized up on my WJ, after taking it apart turned out it just needed new slide pins. I cleaned the dirt and grime off the caliper with a wire brush, made sure to grease the crap out of the pins and while I was at it put new pads on. Not an issue any more.
BigMateo is offline  
post #8 of 23 Old 04-05-2020, 12:40 AM
Bigrigr
Registered User
 
Bigrigr's Avatar
2000 WJ 
 
Join Date: Jan 2020
Location: Near SLC
Posts: 863
Garage
Thats interesting that those calipers are recent. They should definitely not have problems yet, unless they got REALLY hot. Could be just autozone junk....No amount of grease will help with a caliper piston that is seized in the bore....

Autozone isn't my favorite, but maybe because i just haven't ever used their stuff, but i suggest if you go back there, to get their best stuff ONLY. Top of the line semi-metallic pads are all i use. And their best grade calipers for sure.

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,4" short arm lift,JK'sW/32's
Bigrigr is offline  
post #9 of 23 Old 04-05-2020, 05:20 AM Thread Starter
wjkeith
Registered User
 
wjkeith's Avatar
 
Join Date: Aug 2018
Posts: 213
Garage
Could something in the abs system cause the pistons to not relax? A few times in the recent past Iíve felt the abs pump come on while braking. Dry roads, no panic stop etc.
wjkeith is offline  
post #10 of 23 Old 04-05-2020, 07:39 AM
Blackwater5dad
Registered User
2004 WJ 
 
Join Date: Dec 2017
Posts: 28
Garage
Does the caliper release when you open the bleeder screw?
That's usually the easiest way to tell if the problem is due to trapped pressure from a bad hose or something further up.

I had a caliper suddenly start dragging on my old dodge Dakota a few years ago driving home from work. I opened the bleeder on the side of road, fluid shot out and caliper released. I pinched off the brake hose with a pair of vice grips and continued on my way. Replaced the brake hose and all was well.


Sent from my SM-T380 using Tapatalk

BlackwaterVB5dad
Blackwater5dad is offline  
post #11 of 23 Old 04-05-2020, 08:55 AM Thread Starter
wjkeith
Registered User
 
wjkeith's Avatar
 
Join Date: Aug 2018
Posts: 213
Garage
Quote:
Originally Posted by Blackwater5dad View Post
Does the caliper release when you open the bleeder screw?
That's usually the easiest way to tell if the problem is due to trapped pressure from a bad hose or something further up.

I had a caliper suddenly start dragging on my old dodge Dakota a few years ago driving home from work. I opened the bleeder on the side of road, fluid shot out and caliper released. I pinched off the brake hose with a pair of vice grips and continued on my way. Replaced the brake hose and all was well.


Sent from my SM-T380 using Tapatalk
On the caliper that was seized I tried to compress the pistons in my vice. No go. I think the issue is upstream. Master cylinder failing?
wjkeith is offline  
post #12 of 23 Old 04-05-2020, 09:32 AM
Bigrigr
Registered User
 
Bigrigr's Avatar
2000 WJ 
 
Join Date: Jan 2020
Location: Near SLC
Posts: 863
Garage
Quote:
Originally Posted by wjkeith View Post
On the caliper that was seized I tried to compress the pistons in my vice. No go. I think the issue is upstream. Master cylinder failing?

I guess it COULD possibly something with the ABS, but im not sure what exactly. If you have a seized caliper piston, i cant figure anything with the ABS causing it to lockup. I can see an issue with the pressure not releasing back to the master cylinder possibly resulting from ABS faults, but not the piston seized. Opening the bleeder screw while you are off the brakes like mentioned before, is a good way to tell if you have residual pressure getting stuck at the caliper. Master cylinder could be clogged with gunk and not allowing the fluid to return as well....what does the fluid look like? If it has moisture in the fluid it may cause things to corrode on the inside? This would also swell up all the rubber seals in the system and cause weird things to happen.

'00LMTD-4.7l,242hd,D30,D44A,3.73's,True-trac front,Spartan rear,4" short arm lift,JK'sW/32's
Bigrigr is offline  
post #13 of 23 Old 04-05-2020, 12:43 PM
laybackman
Bikini Bridge Inspector
 
laybackman's Avatar
2010 JK Wrangler 
 
Join Date: Dec 2002
Location: Massachusetts
Posts: 7,312
It could be the phenolic resin lining in the caliper.

You replace worn brake pads. To do that you push the caliper pistons back into the caliper body. You replace the pads slap, it all back together and think you are good to go. Unbeknownst to you every time you hit your brakes the caliper tightens up the brake pads on you rotor....BUT does NOT back off since the phenolic resin liner I mentioned has curled up behind the the caliper piston. Each time you hit the brakes it gets tighter! Look at your brake rotor. Is it a bluish-reddish color!? Replace the rotor, pads and caliper........;-( Those front calipers suck.
2oldjeeps likes this.

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
laybackman is offline  
post #14 of 23 Old 04-05-2020, 03:03 PM
2oldjeeps
Registered User
2000 XJ Cherokee 
 
Join Date: Aug 2017
Posts: 1,666
you said,
"On the caliper that was seized I tried to compress the pistons in my vice. No go. I think the issue is upstream. Master cylinder failing?"
caliper is frozen !!! right there is problem...
laybackman and coldspit47 like this.

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
2oldjeeps is offline  
post #15 of 23 Old 04-05-2020, 05:06 PM
Blackwater5dad
Registered User
2004 WJ 
 
Join Date: Dec 2017
Posts: 28
Garage
By vise, I assume you have it off the car?

If so, as 2oldjeeps said, the piston is seized or stuck on the caliper.

Sent from my SM-T380 using Tapatalk

BlackwaterVB5dad
Blackwater5dad is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome