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#1
08-27-2002, 05:51 PM
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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 
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#2
08-27-2002, 05:58 PM
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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
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#3
08-28-2002, 12:13 AM
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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...
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#5
08-28-2002, 11:19 AM
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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
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#6
08-28-2002, 12:16 PM
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<<< piston appears to be moving smoothly (checked it)>>>
Do you mean pistons ??
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#7
08-28-2002, 01:07 PM
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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.
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Ali Al-Chalabi 2001 CLK55 1999 Dodge Ram 2500 Cummins Diesel 2002 Harley-Davidson Fatboy Merlin Extralight w/ Campy Record
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#8
08-28-2002, 02:15 PM
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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 02:22 PM.
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#9
09-04-2002, 03:11 AM
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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
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#10
09-04-2002, 06:33 AM
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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.
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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss Michael 2014 E63S Estate 2006 SLK55 1995 E500 1986 Porsche 944 turbo
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