Rear brake pistons - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > Rear brake pistons

ROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO Savvy FREE SHIPPING!Year End Clearance Sale! Save 20%

Reply
Unread 03-08-2013, 09:08 AM   #1
Ideford Jeep
Registered User
2000 WJ 
 
Join Date: Dec 2007
Location: Devon, England
Posts: 37
Rear brake pistons

2000 4.0 WG Ltd

In the process of replacing my rear brake pads, I found that the pistons will not return into the caliper - the calipers are now off the car and no fluid in it or brake line attached so there is no prblem relating to brake line acting as a one way valve.

The pistons will go part way in before binding - there is no noticable lip on the piston or caliper. However the piston appears to be made out of some sort of fibre and not metal - has this 'crushed' slightly causing the piston to distort? Can this be machined safely? Has anyone else come across this - a search shows some problems with rear brake pistons binding but no-one has commented on the pistons.

Also, does any-one know if the WJ calipers/pisotns are compatible with the WG (European version)?

Ideford Jeep is offline   Reply With Quote Quick reply to this message
Unread 03-08-2013, 09:52 AM   #2
funkduck
Registered User
2002 WJ 
 
Join Date: Apr 2012
Posts: 1,179
I apologize that I don't have much to add to this, except to say that my pistons just easily slid all the way back so it's clear (to me) that they're meant to go all the way in.

I had brakes on an Isuzu that had to be "screwed" back, using a special tool (or the tips of needle-nose pliers).
__________________
Your loss.
funkduck is offline   Reply With Quote Quick reply to this message
Unread 03-08-2013, 03:50 PM   #3
shepd
Registered User
2000 WJ 
 
Join Date: Jan 2011
Location: Kitchener, ON
Posts: 476
http://www.wjjeeps.com/brakes.htm

I can't say if you can machine them (I would say it's a bad idea, myself, but I'm no expert). The pistons themselves are made of a phenolic plastic. Strong, but not shatterproof.

I don't think the pistons would deform, instead, is the bore rusty/dirty/poorly machined?
shepd is offline   Reply With Quote Quick reply to this message
Unread 03-08-2013, 05:23 PM   #4
multmigs
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: browntown
Posts: 1,017
if the pistons were forced back using a c clamp and had alot of corrosive stuff all around them they might have deformed. They usually are replaceable instead of replacing the entire caliper if you are into DIY. I found that Jeep itself was selling a kit for the front Akebono calipers which has 2 new pistons and all the associated seals for cheaper than i could buy online last year. Did both fronts for price of single reman caliper myself on a saturday.
multmigs is offline   Reply With Quote Quick reply to this message
Unread 03-09-2013, 01:13 AM   #5
alfaitalia
CRD Pilot!
 
alfaitalia's Avatar
2004 WJ 
 
Join Date: Feb 2011
Location: Bognor, West Sussex. England. Great Britain
Posts: 3,368
I did mine recently and had the same problem. I re attached the hose to push the piston nearly all the way out then disconnected the hose and pulled the piston out using soft grips. The piston are ceramic so be careful. Everything looked ok but on closer inspections there was like a thin varnish build up on the piston and dirt in the groove that the seal sits in. A quick clean of both (and the caliper bore) with solvent and 1000 grade yet and dry paper followed by reassembly using lots of fresh brake fluid as lube to make sure the real stayed seated and the piston was I nice sliding but tight fit and works perfectly.
__________________
There are 10 types of people in the world......those that understand binary...and those that don't.
alfaitalia is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.