synack21

I recently purchased a 2011 C63 with 69k mi. So far everything is great except for a couple of things. One is the missing front emblem on the grille and #2 squeaking from the front brakes when coming to a stop. The pads have plenty of meat on them. One thing that is very noticeable is that both rotors have a rust ring just right above where the pad no longer touches and right below again where the pad no longer touches. Could this be the cause of the squeaking? What causes these rust rings to occur? The squeaking only occurs under light braking like when coming to a stop at a red light. I hate the way this sounds....here I am with this nice car and having this horrible loud high pitch squeak. Not cool! Lately, I have just been using the lower gears to bring down my speed (love hearing the blips and the sound of the motor as it slows!!) but I still would like to use my brakes without the embarrassing squeaking. If anyone has any answers to stop the squeaking and to get rid of the rust rings I would greatly appreciate it. I will also post some pics tomorrow.

Things I have done to try and resolve this issue:

• Numerous times getting up to speed and bring the car to abrupt stop to heat up the brakes...didn't work!
• I have tried going in reverse and braking hard....didn't work!

Any help or advice would be greatly appreciated. My car does not have the P31 performance package so does this mean my car does not have the Brembos?

Vladds

The front pads squeaked with my car too. I don't usually put up with this but somehow I had too many other things I wanted to improve and a year later I had to do brakes. I decided to continue with OEM front pads and rotors and noticed the part number for the rotors and pads had been substituted.
Once I was done with the replacement and bedded the brakes, the squeak did not come back and this time the pad sweeps all the width of the rotor on the outer side, there is no more un-swept ring.
However I did use the normal squeak-stop glue for the back of the pads, so I knew that one way or another they will not squeak.

Yuille36

Listen, the owners manual clearly states it, and your Service advisor will say it as well.
"The high-performance brake system is designed to operate under the extremely high operating demands required to accommodate the performance capabilities of the vehicle.
The brakes may produce a squeaking-type noise depending on the vehicle speed brake force applied, ambient conditions, e.g. temperature and humidity."

I had this same brake squeal on both my E63 and C63, and the dealership wouldn't do anything about it. I had to take matters in my own hands and changed the pads to ceramic, and that eliminated my brake squeal issue.
I used Stop Tech Ceramic Pads.

INS1GNIA

I just had the same issue synack21, tried everything you mentioned and dealer couldn't fix it with glues, sprays, etc. It sounded like a bus when coming to a stop...couldn't take it anymore. I ended up just replacing my pads/rotors to get rid of squeak. My pads were close to being due for a change, so I just replaced everything at once.

Will just post this here in case you are interested:
Pads - Porterfield R4-S (but you can get any)
Rotors: I ordered from two sites (lowest prices at that time). I always use OEDiscountParts when I can, (Tracy is great there). FCPEuro has great selection and an amazing replacement/warranty (lifetime).

OEDiscountParts - Rear (2044230412) - $49 each, plus shipping
FCPEuro - Front (0004212012) - $121 each, plush shipping

synack21

Well, this is interesting to know. Thanks for the information guys. I appreciate it. I will look into changing the pads to something different. The dealer I bought it from gave me a 1000mile/1month warranty. I have an appointment tomorrow to drop it off with them. With them being an independent car dealer that sells all sorts of used cars I highly doubt they know about this issue. Hopefully, they can just replace with what you mentioned INS!GNIA or just at least some ceramic pads like Yuille36 mentioned. Again, thanks everyone for the help.

msgadget

to
thank you, Tracy 😁

chrisridebike8

I run the Porterfield R4-S pads they are great street pads quiet, lower dust. but if you get them hot, they seem to smear easily. a couple of pulls on the freeway and I feel like they start to near their operating temp limit. I wouldn't want to track these pads, but for street they are fine. you won't be able to tell a difference compared to OEM except the lack of squeak.

Vladds

I am telling you, for a fact, that you can have OEM and no squeek. I currently have OEM and no squeek.

roadkillrob

2 C63's never ever had a squeek from my brakes - my old S4 that is another story!

I have had luck in the past grinding off those rusty rings, they seem to touch the pad when lightly braking and cause noise, especially the outside one - have ground that off on other cars and it has solved the noise for a while.

AA717driver

Yuille36

One of the biggest improvements you can make, to decrease your brake squeal is applying a generous amount of anti squeal paste, onto the back of your pads. I also applied a good amount to the backing plates of the pads, and inside of the corners of the calipers.
As well as apply antiseize compound the caliper pins. Basically anywhere that the pads make contact with the caliper, is covered with antisqueal compound. It has now been several months and no squeal whatsoever. I have done this to every AMG I've owned, and so far it has worked.

synack21

So finally made a video of what my brakes sounds like. Here is the link for the video I made.

Yuille36

Brake squeal is a common problem with all brakes, and is caused by a number of conditions: Worn pads, glazed pads and rotors, broken anti rattle clips, lack of pad insulation or insulation shims.
You can effectively eliminate the squeaking and squealing with anti-squeak compound. All (3) AMGs that I owned had brake squealing issues, until I addressed the issue. Haven't had any issues since.

synack21

So to fix the squeal issue you are saying I just need to add some anti-squeak compound and that will address the squeal? Or I need to find out what exactly is causing it by seeing if it is any of the above that you mentioned?

Vladds

Use antisqueel compound. It works every time. I've used it on all different cars over many years, it solves it every time.
Do a good job.
1. Buy a brass wire brush and carefully brush all seating/guide areas.
2. Un-do the old brake pads, do the work to remove them.
3. Clean everything, make sure the seating area of the pistons that touches the back of pads is clean, that metal shows. Don't remove the piston chrome coating, just clean it.
4. Use brake guide area lubricant and possibly with a q-tip only lubricate the area where the brake pad "ears" sit inside the caliper. Make sure you understand which area this is.
5. Put brake squeel stop glue on the back of the brake pads, make a good thickness coat, you can't see the black of the steel of the back of the pad, in the area where the piston touches it.
6. Button up the work
7. Bleed the brakes
8. Bed in the brakes. Now the bedding of the brakes described in the WIS and in the pad instructions is for new pads on new rotors. For new pads on old rotors, you need to put more time into the process. Be safe however and realize that there's a lot of stress going into the system when you do this. I physically broke a rear rotor in a 1994 Mercedes years ago.

There will be no squeel. There was none in cars with fixed calipers, floating calipers, all different makes, replaced pads only, pads and rotors as well, German cars, Italian cars, Japanese, Mercedes from 1982, 1987, 1994 and so on..
What mechanics tell you "these cars squeel anyway" should be translated as following:
"I don't have time to do a full brake job for you. That's for enthusiasts and racing people"

Yuille36

I couldn't have said this any better, Antiseize and antisqueal compound is your friend when applied properly.

synack21

So I took it back to the dealer I purchased the vehicle from. They deglazed the rear pads, turned the rotors and put the anti-squeal grease on front & back brakes. It seems to have taken that nasty city bus like squeal away. I do get a light squeal every now and then but nowhere near like it was. Thanks, everyone for their input.

Yuille36

Your welcome

synack21

Well well well....the squeaking has reared its ugly head again. The above mentioned seemed to have worked for a few weeks but now has started squeaking again. Anyone know what could be causing this nasty squeak?

Yuille36

Obviously the squeak is caused by two pieces of metal contacting each other thereby causing them to vibrate.
https://www.google.com/search?source....0.IxzHEOFTZfM

Duffer4126

synack21

Again this squeal only happens when coming to a slow stop like coming to a stop sign or red light and everyone looks over to see what POS is causing all this noise. lol Very annoying and embarassing...sorry everyone its just my nice *** Mercedes that sounds like **** when coming to a stop. I hope to find a remedy for this nasty squeal.

Yuille36

Get rid of the metallic pads, and replace them with Ceramic. The initial bite isn't as great as metallic, but the squeal and the dust would be history.