Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-27-2002, 06:51 PM
Registered User
 
Join Date: Dec 2000
Location: Fairfax County, Virginia
Posts: 856
Why do Inside and Outside Rear Brake Pads Wear Differently

On changing my W126 rear brake pads I noticed a significant wear difference ... the outside pads were worn out and the insides looked like they could go another 100K. It was the same on both sides ...

There is likely a good reason for the difference in wear - I suspect it may not even be related to a problem?
__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
Reply With Quote
  #2  
Old 08-27-2002, 06:58 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The brake calipers must not be operating properly!!
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 08-28-2002, 01:13 AM
TANK
Guest
 
Posts: n/a
Is it ok for the front wheels (not tires) to be warm after light braking on a 4 mile run? Just curious because the rear wheels were totally cool...
Reply With Quote
  #4  
Old 08-28-2002, 11:02 AM
J.HIDALGO's Avatar
Registered User
 
Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Tank,

I think is like 90% of your braking job is done by the front brakes. Therefore, the difference in temperature.
__________________
J.H.
'86 300E
Reply With Quote
  #5  
Old 08-28-2002, 12:19 PM
Registered User
 
Join Date: Dec 2000
Location: Fairfax County, Virginia
Posts: 856
MBDoc,

That's what I thought, too ... piston appears to be moving smoothly (checked it) ... isn't it odd that BOTH rears would wear the same ... maybe any apportioning issue at the master cylinder?
__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
Reply With Quote
  #6  
Old 08-28-2002, 01:16 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
<<< piston appears to be moving smoothly (checked it)>>>

Do you mean pistons ??
Reply With Quote
  #7  
Old 08-28-2002, 02:07 PM
Ali Al-Chalabi's Avatar
Senior Member
 
Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
I experienced the same thing to a lesser degree when I changed the rear brake pads on my C280. Outer pads were 2 mm thick and inner pads were 3 mm thick. Pistons move freely are not sticking. It was the same exact wear pattern on both wheels, but for some reason the inner pads were worn just a touch less.
__________________
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
Reply With Quote
  #8  
Old 08-28-2002, 03:15 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
If both pistons are moving freely, it just may be that there is a slight amount of air/crud at the bleeder port and the inside piston is the
last in line , therefore being the last to move...????
Just conjector... but I would bleed anyway....

Last edited by Arthur Dalton; 08-28-2002 at 03:22 PM.
Reply With Quote
  #9  
Old 09-04-2002, 04:11 AM
Registered User
 
Join Date: Dec 2000
Location: Fairfax County, Virginia
Posts: 856
Yeah ... meant pistons ... one for each side of the rotor on the rears ...

Can buy the problem alternatives ... just seems odd that it would be on BOTH rear brakes with no difference ...

Thanks.
__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
Reply With Quote
  #10  
Old 09-04-2002, 07:33 AM
Michael's Avatar
Veteran
 
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
George,

I agree it's pretty coincidental that you've encountered this phenomenon on both rear brakes; however, there's no question that the pistons that contacted the greater-worn pads are hanging up in their bores, and need to be rebuilt.
__________________
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

Michael
1995 E500 street car
1986 Porsche 944 Turbo S track car
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:13 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page