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Excessive Front Rotor Wear when compared with pad wear. Why?
Thread Starter
MBWorld Fanatic!
Joined: Mar 2008
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From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
Excessive Front Rotor Wear when compared with pad wear. Why?
The car has done 50,000 km & the front rotors have worn from 28mm to 27 mm . The thickness limit before change out is 26 mm.
What has baffled me is that the average pad wear on both fronts is just above 1 mm also. ie just below 12 mm from original 13 mm.
So my pads are wearing almost at the same mm rate as my rotors.
From this forum I read that we can expect 2 pad changes for one rotor change. This obviously will not happen . I will be changing my rotors with about 10.5 mm still left on my pads
I am a conservative country driver.
I would be pleased to hear any feed back & recomendations.
JC
What has baffled me is that the average pad wear on both fronts is just above 1 mm also. ie just below 12 mm from original 13 mm.
So my pads are wearing almost at the same mm rate as my rotors.
From this forum I read that we can expect 2 pad changes for one rotor change. This obviously will not happen . I will be changing my rotors with about 10.5 mm still left on my pads
I am a conservative country driver.
I would be pleased to hear any feed back & recomendations.
JC
Senior Member
Joined: Feb 2008
Posts: 300
Likes: 2
From: Toronto
2008 c300
Hi Carsy
The way I read your post the pads are wearing twice as fast as the rotor.
ie 1 mm from the pads on each side of the caliper, but only 0.5mm from each side of the rotor?
But could be reading it wrong
hth
The way I read your post the pads are wearing twice as fast as the rotor.
ie 1 mm from the pads on each side of the caliper, but only 0.5mm from each side of the rotor?
But could be reading it wrong
hth
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Joined: Nov 2007
Posts: 2,078
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From: NYC
2012 C300 4Matic
I'm not sure what rate of wear is 'correct' for MB rotors, but I've always been told that they are made of a very soft material for better performance at the expense of longevity.
On my W203 I attempted to replace my half-worn OEM pads (had about 24k on them) with new pads - keeping the old rotors. It was no good - the rotors were very worn, and at an angle no less which matched the wear of the factory pads. New pads without that same angle didn't "match" to the rotors and were useless. Had to either replace everything or re-install the original pads. Ever since I have always been of the belief that new pads = new rotors on an MB for best performance.
On my W203 I attempted to replace my half-worn OEM pads (had about 24k on them) with new pads - keeping the old rotors. It was no good - the rotors were very worn, and at an angle no less which matched the wear of the factory pads. New pads without that same angle didn't "match" to the rotors and were useless. Had to either replace everything or re-install the original pads. Ever since I have always been of the belief that new pads = new rotors on an MB for best performance.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
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From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
ACR2001 , Thanks for the good advice.
These rotors are in perfect condition. Braking is super smooth with lots of feel. Absolutely no sign of judder.
They will do for a another few years so will change out the hole shibang then.
These rotors are in perfect condition. Braking is super smooth with lots of feel. Absolutely no sign of judder.
They will do for a another few years so will change out the hole shibang then.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2008
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From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
Rear Pad wear 2mm ,Rotor wear 1mm.
Rear Rotor wear is similar to fronts for 50,000 km.
Original 10 mm.Rotor
Now 9 mm.
Low limit 8.3mm
Pads .
Original 12 mm .
Now 10 mm.
If the present wear rate continues I will have worn out the rear rotors when the pads still have 8.5 mm left!
I have never experienced this before.
I was wondering ,seeing that I have no reason to use the brakes heavily & constantly ( county driving) , whether the pads accumulate a hard surface when being used lightly & this hard surface adds excess wear to the rotors ?.
Original 10 mm.Rotor
Now 9 mm.
Low limit 8.3mm
Pads .
Original 12 mm .
Now 10 mm.
If the present wear rate continues I will have worn out the rear rotors when the pads still have 8.5 mm left!
I have never experienced this before.
I was wondering ,seeing that I have no reason to use the brakes heavily & constantly ( county driving) , whether the pads accumulate a hard surface when being used lightly & this hard surface adds excess wear to the rotors ?.
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MBWorld Fanatic!
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From: Sydney, Australia
190D 2.5 (x2), 190E 2.6, W202 C240,W202 C43 (C55), W210 E55, W212 E250CDI
Pad and rotor wear isn't a constant thing. Hard braking tends to wear the pads whilst minor pedal pressure tends to result in higher rotor wear.Not sure of the exact science behind it, it's just how it is. It's different for everyone.
Some of my cars need rotors every pad change, others get 2-3 pad changes.
Some of my cars need rotors every pad change, others get 2-3 pad changes.
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MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
Likes: 9
From: Delaware
2004 Mazda6, 1993 RX7
My general experiences: when Racing my 7 at HPDE's, my Porterfield race pads woud grind into the wearing rotor ... as it looked like an old LP record. A fellow racer had Peformance race pads that just buffed the rotors shiny, with tiny micro cracks on the rotor surface.
Dealing with "PBR" low dust pads on other cars, the MetalMasters would eat the rotors, while the Deluxe pads showed easy wear on the rotors.
Point is rotor wear can vary in the Industry, and observed wear in this is very helpful.
.
Dealing with "PBR" low dust pads on other cars, the MetalMasters would eat the rotors, while the Deluxe pads showed easy wear on the rotors.
Point is rotor wear can vary in the Industry, and observed wear in this is very helpful.
.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
Likes: 56
From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
Pad and rotor wear isn't a constant thing. Hard braking tends to wear the pads whilst minor pedal pressure tends to result in higher rotor wear.Not sure of the exact science behind it, it's just how it is. It's different for everyone.
Some of my cars need rotors every pad change, others get 2-3 pad changes.
Some of my cars need rotors every pad change, others get 2-3 pad changes.
Thanks for your thoughts. It would be interesting to know about the science .
I suppose once you know about your driving style/ pad rotor wear you might be able to compensate by buying differing pad hardnesses.
Do you know of a softer pad that would suit me next time.?
JC
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Joined: Jan 2007
Posts: 1,152
Likes: 29
From: Sydney, Australia
190D 2.5 (x2), 190E 2.6, W202 C240,W202 C43 (C55), W210 E55, W212 E250CDI
I'm not as knowledgable on this but I'll explain what I learnt when I was having trouble with trackday pads.
I was having trouble with overheating pads even thought they were very hi temp pads. It was explained to me that the issue was that the compound was based on generating high friction hence the high temps. It was suggested I used a different brand/compound that was designed more around adheasion rather than friction
Yes, I was confused too.
Basicly the pad puts down a layer on the rotor as it beds in. This layer, when hot, adheres the the pad hence giving braking torque. pads wear, rotors have little wear. down side is that when cold they revert to mostly friction to give the braking torque so they actually wear the rotors faster as a daily drive then they do when on the track! When hot and using the adheasion they dont generate as much heat so in my case brake rotor temps dropped 150C by just changing the pads!!!!
I'm sure there is a better way to explain it but you get the idea how rotor wear isn't a constant. Ever seen a race car with big lips on the rotors?
I was having trouble with overheating pads even thought they were very hi temp pads. It was explained to me that the issue was that the compound was based on generating high friction hence the high temps. It was suggested I used a different brand/compound that was designed more around adheasion rather than friction
Yes, I was confused too.Basicly the pad puts down a layer on the rotor as it beds in. This layer, when hot, adheres the the pad hence giving braking torque. pads wear, rotors have little wear. down side is that when cold they revert to mostly friction to give the braking torque so they actually wear the rotors faster as a daily drive then they do when on the track! When hot and using the adheasion they dont generate as much heat so in my case brake rotor temps dropped 150C by just changing the pads!!!!
I'm sure there is a better way to explain it but you get the idea how rotor wear isn't a constant. Ever seen a race car with big lips on the rotors?
Last edited by Ausmbtech; Nov 28, 2011 at 07:23 PM.
Super Member
Joined: May 2010
Posts: 816
Likes: 21
2008 W204
I'm not sure what rate of wear is 'correct' for MB rotors, but I've always been told that they are made of a very soft material for better performance at the expense of longevity.
On my W203 I attempted to replace my half-worn OEM pads (had about 24k on them) with new pads - keeping the old rotors. It was no good - the rotors were very worn, and at an angle no less which matched the wear of the factory pads. New pads without that same angle didn't "match" to the rotors and were useless. Had to either replace everything or re-install the original pads. Ever since I have always been of the belief that new pads = new rotors on an MB for best performance.
On my W203 I attempted to replace my half-worn OEM pads (had about 24k on them) with new pads - keeping the old rotors. It was no good - the rotors were very worn, and at an angle no less which matched the wear of the factory pads. New pads without that same angle didn't "match" to the rotors and were useless. Had to either replace everything or re-install the original pads. Ever since I have always been of the belief that new pads = new rotors on an MB for best performance.
