Rear Brakes Squealing
Out Of Control!!
Joined: Nov 2018
Posts: 11,467
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From: San Francisco Bay Area
2019 C63CS
First question, are you sure it's the rear? You have the carbon ceramic brakes, and they can and will squeal. That's just the nature of the beast. But even with the CCBs, the rears are still standard iron brakes, pretty much the same brakes as w/o the CCBs. They tend to start squealing once they are worn. Your mileage is pretty low for the rear brakes to be worn already, but FWIW, mine started to squeal and shortly after that the brake wear sensor tripped. The squeal stopped after replacing the pads and bedding them in. Have you measured your pads?
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 46
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2019 C63S
First question, are you sure it's the rear? You have the carbon ceramic brakes, and they can and will squeal. That's just the nature of the beast. But even with the CCBs, the rears are still standard iron brakes, pretty much the same brakes as w/o the CCBs. They tend to start squealing once they are worn. Your mileage is pretty low for the rear brakes to be worn already, but FWIW, mine started to squeal and shortly after that the brake wear sensor tripped. The squeal stopped after replacing the pads and bedding them in. Have you measured your pads?
yeah its the rear, mainly the rear left
they squeal when you gently press the brakes when coming to set of lights, if firmly pressed they wont squeal
i have not measured the rear pads
MBWorld Fanatic!
Joined: Jul 2011
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2019 AMG GT R
you dont even need to measure them.. a visual inspection should be enough to determine if they are worn out or not
Super Member
Joined: Mar 2019
Posts: 600
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From: NYC area
2019 C63S Coupe
Last month the Check Brake Pad light came on and needed rear rotors and brake pad replaced. The Dealership bedded in the brakes for me.
I believe it had just under 18,000 miles.
No more squealing. What a pleasure.
Out Of Control!!
Joined: Nov 2018
Posts: 11,467
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From: San Francisco Bay Area
2019 C63CS
In that case I would inspect them. Sounds like they are worn. A bit of squeal is not unusual with performance brakes. I get a slight squeal under light braking just as I come to a stop. Basically the last 1 mph to 0, but it's so faint I only hear it with the windows open, and it depends on whether the brakes are hot or cold and how much hard driving I've done lately. The rear brakes are kinda hard to bed as they don't do much braking, but make sure you can visually see a layer of pad material on the rotors.
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Newbie
Joined: Feb 2022
Posts: 14
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From: Seminole, Fl
2021 C63s
In that case I would inspect them. Sounds like they are worn. A bit of squeal is not unusual with performance brakes. I get a slight squeal under light braking just as I come to a stop. Basically the last 1 mph to 0, but it's so faint I only hear it with the windows open, and it depends on whether the brakes are hot or cold and how much hard driving I've done lately. The rear brakes are kinda hard to bed as they don't do much braking, but make sure you can visually see a layer of pad material on the rotors.
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Out Of Control!!
Joined: Nov 2018
Posts: 11,467
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From: San Francisco Bay Area
2019 C63CS
I also get the "slight squeal under light braking". I had the windows down on my drive this morning and it's definitely something I'd rather not hear if there's an easy fix. I'm only at 3500 miles and am confident that my pads and rotors have plenty of meat left.... so I'm ASSUMING its just the nature of the OEM pad material. Would maybe an aftermarket ceramic pad alleviate the noise?
Super Member
Joined: Mar 2009
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From: Las Colinas (Irving, Texas)
2024 GLE 63 S AMG SUV
Just install Porterfield R4-S rear brake pads on your car and the squealing will be gone!
https://porterfield-brakes.com/produ...-s/ap1669-r4-s
https://porterfield-brakes.com/produ...-s/ap1669-r4-s
Senior Member
Joined: Dec 2017
Posts: 308
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From: Charlotte, NC
17 C63S Coupe PTG1000
While I don’t have carbon ceramics, I believe (as someone stated) the rear rotors are steel. I recently changed my front and rear pads on my 63S coupe at 13k. They didn’t need changing but they squealed and a wanted to try a lower dust solution (Porterfield R4-S).
What I noticed during the change is the OE pads have a separate/second metal backing plate between the pad itself and the caliper pistons/boots. This, mixed with the lack of anti squeal paste will result in noise.
After swapping in the porterfields, no more noise. You could add those to your rears.
What I noticed during the change is the OE pads have a separate/second metal backing plate between the pad itself and the caliper pistons/boots. This, mixed with the lack of anti squeal paste will result in noise.
After swapping in the porterfields, no more noise. You could add those to your rears.
Last edited by noremaC; Apr 20, 2022 at 08:39 PM.
MBWorld Fanatic!
Joined: Jul 2011
Posts: 1,146
Likes: 207
2019 AMG GT R
While I don’t have carbon ceramics, I believe (as someone stated) the rear rotors are steel. I recently changed my front and rear pads on my 63S coupe at 13k. They didn’t need changing but they squealed and a wanted to try a lower dust solution (Porterfield R4-S).
What I noticed during the change is the OE pads have a separate/second metal backing plate between the pad itself and the caliper pistons/boots. This, mixed with the lack of anti squeal paste will result in noise.
After swapping in the porterfields, no more noise. You could add those to your rears.
What I noticed during the change is the OE pads have a separate/second metal backing plate between the pad itself and the caliper pistons/boots. This, mixed with the lack of anti squeal paste will result in noise.
After swapping in the porterfields, no more noise. You could add those to your rears.
the OE pads were always squealing and I couldnt stand them even though their initial bite was stronger
Thread Starter
Junior Member
Joined: Jan 2022
Posts: 46
Likes: 7
2019 C63S
Just install Porterfield R4-S rear brake pads on your car and the squealing will be gone!
https://porterfield-brakes.com/produ...-s/ap1669-r4-s
https://porterfield-brakes.com/produ...-s/ap1669-r4-s
I might give these a go, hows the brake dust on these?
