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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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Discussion Starter #1
Well, this started as a brake pad change post.

My 140.043 has no rear brake pad wear sensors, and since I have almost 120,000 miles/10 years on the ORIGINAL PADS, I thought, "Ah, what the heck, let me just change them".

As you can see from the post, the rear pads and rotors are NEARLY NEW!!

Anyhow, the procedure is the same. Just substitute "New Pads" for "Replace Pads".

For reference, my Front Pads lasted almost 100,000 miles before hitting the wear sensor.

Since most cars are a 80/20 split between front/rear braking, this might explain the lack of rear wear.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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Discussion Starter #3
whoops! Forgot to put the wheel back on!!

whoops
 

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1997 S500V
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272 Posts
Excellent pix! I am impressed with the mileage you are getting out of your brakes. The last time I changed all 4 brake corners, I was suprised they were all evenly worn. I bought ATE rotors and pads and the experienced MBZ mechanic mentioned that MBZ designed all 4 brake corners to wear out evenly at the same time despite the weight transfer during braking.

My initial thought was your brake proportioning was biased towards your front brakes...thus allowing your back brakes to barely wear.
 

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Thats odd... I have the wheels off mine, had the rims re-painted, so i figured i might as well change the pads, i noticed the rear pads are worn just about to the sensors, front pads still have plenty meat on them.
 

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1987 560SL - 1994 S420 - 2005 S55 AMG
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341 Posts
I have heard the hardware should be replaced each time the brake pads are replaced; however I also re-use the pins and springs. I always clean the pins throughly to ensure they allow for ease of movement. Does anyone buy all new hardware when they replace their brake pads and is there a safety issue in re-use of the old brake hardware (ie pins, springs). Also if the sensors are not worn down can they be re-used safely? (I do it)
Great Pictures G-AMG!
 

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1996 S320 (Kuro) 1998 S600 (Weiss)
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Thanks a million - I've .pdf'd this and added it to the knowledge thread.
 

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1993 300SEL (Sold) 2007 X5
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Thats odd... I have the wheels off mine, had the rims re-painted, so i figured i might as well change the pads, i noticed the rear pads are worn just about to the sensors, front pads still have plenty meat on them.
I'd say the previous owner replaced the fronts and then not the rears as they still had life left in them.
 

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'04 G55 '80 280GE '99 S420 '98 E320 2011 E350 2016 GLA250
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Discussion Starter #10
I have heard the hardware should be replaced each time the brake pads are replaced; however I also re-use the pins and springs. I always clean the pins throughly to ensure they allow for ease of movement. Does anyone buy all new hardware when they replace their brake pads and is there a safety issue in re-use of the old brake hardware (ie pins, springs). Also if the sensors are not worn down can they be re-used safely? (I do it)
Great Pictures G-AMG!
Chief,

The WIS is usually quite clear as when to install NEW parts (ie. when replacing the calipers, use NEW Encapsulated Bolts).

I have never seen any sort of mandate for disc brake work.

Now, on the G-Wagen W460 with the rear DRUM brakes, it DOES specify replacing the internal springs and hardware after every SECOND brake service, but NOTHING about the front disc brake hardware.
 

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2008 C200K (W204) & 1998 SL500 (R129) Imperial Red
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I Know this is an old thread, but thanks G-AMG, great write up! I am going to do the brakes on my S320 tomorrow, and those disc thickness specs were very useful since I want to get my discs skimmed..

Much respect comrade!
 

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1999 S420; 2007 S600
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416 Posts
Great walkthrough, thank you very much! Easy job once you know what you're looking at. These are a bit different than other brakes I've worked on. As a note, I think these are original pads. They were nice and quiet and had perfect stopping power when going forward but made a HORRIBLE loud squeal in reverse, that sounded like metal on metal, even though I could see that there's plenty of pad left. After a week at the beach, hearing this horrendous squeal inside a parking garage every day when we'd come & go, I decided to replace them. New pads are whisper quiet, so that's good.

One thing to note is that at 65000 miles, the old pads still had 90+% of the pad left. I guess it was just from the 12-year-old material; and they had no shims, but I'm not sure if that would make any difference.
 

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93 190E 2.3, 94 E320 (sold), 01 E320, 99 S320, 18 Durango
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While installing the new wheels I noticed groves in the rotor as seen in the pictures below on the rear passenger side only and there is no lip at the edge.
The brake pads on both sides seem very low and I am planning to replace the pads, but do I need to do the rotors as well because of those groves?
The driver side rear rotor looks fine with smooth surface.

Car: 1999 S320 SWB with 113k miles.
 

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1995 Mercede-Benz S500
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When installing the new pads you should get the rotors resurfaced. Its bad to put new pads on rotors that have grooves in them because your new pads will have uneven wear.

If you can find a shop that does brake resurfacing instead of having to buy a set of new rotors. At our shop we charge $12 per rotor to resurface them even and smooth.
 

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93 190E 2.3, 94 E320 (sold), 01 E320, 99 S320, 18 Durango
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I just finished installing the rear pads and the old pads where stuck in place and very hard to pull out due to a lot of dust build up. I think the old pads are the original pads or maybe was replaced only once before (113k miles now).
 

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93 190E 2.3, 94 E320 (sold), 01 E320, 99 S320, 18 Durango
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Forgot to mention that I ntoiced when I was replacing the rear pads that the pads worn unevenly on each side.
On the passenger side, the inner pad worn more than the outer pad.
On the driver side, the outer pad worn more than the inner pad.
Also the brake pad wear sensor was only on the passenger side.
What could be the reason for that? or is it normal?
 

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86 190E 2.3L 16V, 2 95 320TE's, 02 S500
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Single rear wear sensor is normal. Approximately how much difference in material thickness between outer/inner pads? Does the difference in thickness seem consistent between the two sides?
 

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93 190E 2.3, 94 E320 (sold), 01 E320, 99 S320, 18 Durango
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The difference between the two sides is almost the same consistent but the passenger/right side is slightly thicker/thinner than the driver side. It is just not the same inner/outer on each side.
In the pictures below (same photo but with/out flash) the top pads are the passenger side and the lower are the driver's side.
 

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