Yqr

Anyone know what this is? Brakes and everyrhingbhave been checked by MB dealership. They said it was tire bead flexing on rim so the dismounted, sealed and remounted tire. The noise remains.

https://youtu.be/yM9QUYDBIc0

Mikesmith2939

Could be a stone stuck between the back plate and disc on one of the wheels.

RemmyZero

I have the same exact issue with mine. 2016 with ~74,000 miles now. My plan is to replace my brake rotors this weekend or next so i'll take it apart and let you know what I find. My personal guess is that it's my rotor since i've never replaced them for the life of the car, but I won't be sure until I get everything apart. I've replaced the pads once at around 25-30,000 miles with ceramic pads but I don't believe they are the issue. It very well could be a stone or foreign object trapped in there but my thoughts are that it would have popped out by now because i've had this for a while and since it started i've also swapped my summer/winter rims once and didn't see anything obvious.

RemmyZero

So I took the wheel and caliper off and took a good look at everything. I have a slight lip on the front of the rotor, but nothing unexpected. What I did see was two things that tell me it's time to replace the rotor...
1. The back of the rotor has somewhat excessive circular etching, which is not visible on the front
2. The rear pad in the caliper has the normal circular wear marks but there are jagged etchings about 90 degrees to the pad and you can put your fingernail in there so it has some depth.

My pads are ceramic, replaced around 20k miles and the rotors are original (77k miles now). The pads are barely worn but i'm confident i've outlived the life of the rotors. I'll order some this week and replace them next weekend and report back.

Yqr

I dont kno but i took it back to the dealership, they said they put extra lube on the tire and the noise is gone. I honestly dont know with this car anymore. Wierd little crap that $179 you you to death

Trevor Hadley

Show us a picture .....

Yqr

Of what?

blizzard12

It sounds like a broken belt in the tire. Could also be runflat low on pressure:

Yqr

mone sounds really similar to that. And worse when I'm turning around in a u-turn or cul-de-sac.

Yqr

I drove away from the dealership and the noise wasnt noticable, by the time I got home it was grinding the same way.

RemmyZero

I replaced both my front rotors last weekend and the issue is gone. I can't say for certain your problem is the exact same issue but for me it was night and day difference. I have to get my front drivers side tire replaced next week. I'll see if they notice anything when they do it.