caliper/piston question -
LinkBack Thread Tools
post #1 of 2 Old 07-30-2013, 09:20 AM Thread Starter
Registered User
1999 XJ Cherokee 
Join Date: Apr 2008
Location: CA
Posts: 21
caliper/piston question

Replacing the front calipers on my 99 XJ. Went in to Napa and the guy asked me if I needed a metal or phenolic piston. I have no idea. Calipers on there now are stock, but I don't know the difference between the two pistons. Here are the links at napa:

Any ideas which one I need?

TippyJeep is offline  
Sponsored Links
post #2 of 2 Old 07-30-2013, 11:22 AM
Senior Member
Newtons3's Avatar
2006 TJ Wrangler 
Join Date: Feb 2013
Location: Baton Rouge
Posts: 925
Phenolic pistons are plastic. They dont expand as much as metal when they get hot. Arguably they are weaker. the metal pistons are steel. They will expand and contract with the heat. They may sust if you get moisture in your system. They are structurally stronger. The reality is, either will work. I prefer to run the same on both sides although it probably doesnt matter.
Newtons3 is offline  

Quick Reply

Register Now

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

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


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

Email Address:


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.

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