? Cracked caliper piston ??? - F150online Forums



? Cracked caliper piston ???

Reply
 
 
  #1  
Old 07-21-2008, 12:03 AM
Senior Member
Thread Starter
 
Join Date: Apr 2005
Location: Kansas City, Metro
Posts: 228
? Cracked caliper piston ???

Anybody ever come across a cracked / broken piston when doing a brake job?

Finally had to put new pads on. The guys at NTB told me the RR was down below 2mm and wanted to do the job at their rates... yea right.

When I popped the RR caliper off the pads were a little thinner than the rest, but I didn't notice anything. As I went to push the piston back in I noticed two cracks. Basically a V notch about 3/4" on a side. As I pushed I started getting fluid. Kept it up high till I got back with the new caliper, $43.00 @ O'Reilly, Swapped it out and bleed it.

In the past 25 years in doing brake work I've seen little nicks, but never such a big notch cracked out of the piston.

Truck was hit on the opposite corner last fall, but as far as I can remember it's never been hit on the RR.
Reply With Quote
  #2  
Old 07-21-2008, 05:58 AM
Senior Member
 
Join Date: Nov 2006
Location: mass.
Posts: 1,981
never heard of a piston cracking before.as far i i knew they only leak when the seal around it goes bad.
Reply With Quote
  #3  
Old 07-21-2008, 08:07 PM
Member
 
Join Date: Aug 2007
Location: Central Wisconsin
Posts: 43
At approximately 37500 was in the dealer for a oil change. Service advisor came out and told me, I needed new brakes on the rear. I thought boy not many miles on the truck so I asked if I could see them-just to make sure I wasn't about to take one in the rear. Looked at them, and gave the okay. About 15 minutes later he was back, saying the piston caliper was cracked. Went back took a look --two deep cracks about an inch apart. Talked to mechanic-he stated not the first one he's seen on new F150'S. Mine was the driver side rear. Turned out to be an expensive oil change!
Reply With Quote
  #4  
Old 07-25-2008, 10:53 AM
Senior Member
 
Join Date: Apr 2008
Location: The Chi
Posts: 253
yeah, sounds like your gunna need a new caliper
Reply With Quote
  #5  
Old 08-15-2008, 11:22 PM
Senior Member
Thread Starter
 
Join Date: Apr 2005
Location: Kansas City, Metro
Posts: 228
Forgot to mention, THE PISTONS ARE PLASTIC !!!!!

The guy at Oreilly's pointed it out when I picked the new one up. It looks like steel, but scratch it with my fingernail and sure enough
Reply With Quote
  #6  
Old 08-16-2008, 02:39 AM
Senior Member
 
Join Date: Jan 2008
Location: New York
Posts: 265
Yeah a lot of pistons today are plastic AKA Phenolic pistons. Whenever you see phenolic pistons make sure not to used a c-clamp or channel locks directly on the piston or it will crack.
Reply With Quote
  #7  
Old 08-17-2008, 02:21 AM
Senior Member
 
Join Date: Jul 2007
Location: Boston
Posts: 869
I had a cracked piston on my 05. Ended up getting a new caliper at Napa and all is good.
Reply With Quote
  #8  
Old 08-17-2008, 10:57 AM
Senior Member
 
Join Date: Nov 2006
Location: mass.
Posts: 1,981
yea my 96 crown vic p71 has phenolic pistons. i went to replace the front pads and the autozone guy asked" plastic or metal" i assumed since it was a ex cruiser they were metal so.. they looked like they were lol... got the pads took them out of the box.. no fit lol. i always doublecheck now.
Reply With Quote
  #9  
Old 09-23-2010, 10:29 AM
Member
 
Join Date: Jun 2009
Location: Oak Grove LA
Posts: 15
I have actually broken 3 calipers each one had shattered pistons,this is basically the only thread I can find on this so any new info on what could cause this would be awesome. Oh and I push them in with my hand not pliars or anything.
Reply With Quote
 
 
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Zilla98
1997 - 2003 F-150
10
11-02-2015 12:50 AM
aqua-holic
2004 - 2008 F-150
4
10-01-2015 01:21 PM
ayayron
1997 - 2003 F-150
3
09-16-2015 10:01 AM
Robert Buss
Expedition / Navigator
3
09-13-2015 06:19 PM
lestro
Wheels, Tires & Brakes
6
09-03-2015 09:01 PM


Thread Tools
Search this Thread

Posting Rules
You may not post new threads
You may not 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 Off



All times are GMT -4. The time now is 04:14 PM.