Scraping noise when braking
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Joined: Nov 2023
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W221 S320 CDI
Scraping noise when braking
I have recently had my brakes cleaned and the front nearside wheel bearing replaced. Jusr prior to that whenever I was approaching a junction and lifted my foot off the acclerator there is a slight scraping noise which seems to come from the front nearside. As I apply the brake it increases. Picked the car up from my mechanic this morning and the mechanic has had the car up to have a look and despite spinning the wheel he can hear no noise. He did take the car for a short run and heard the noise also but he is at a loss as to what it could be.
Has anyone ever had this issue and found the problem?
Has anyone ever had this issue and found the problem?
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
I have recently had my brakes cleaned and the front nearside wheel bearing replaced. Jusr prior to that whenever I was approaching a junction and lifted my foot off the acclerator there is a slight scraping noise which seems to come from the front nearside. As I apply the brake it increases. Picked the car up from my mechanic this morning and the mechanic has had the car up to have a look and despite spinning the wheel he can hear no noise. He did take the car for a short run and heard the noise also but he is at a loss as to what it could be.
Has anyone ever had this issue and found the problem?
Has anyone ever had this issue and found the problem?
I had a problem that your case might be too, bit of course may not bee.
My drive shaft from transmission to the rear differential was rubbing on the aluminum shield that covers the shaft. Rubbing started after dealer service replaced the flex disks on the shaft when they needed to take the shield off. Shield obviously did not go in place the same way as it was.
The problem was the shaft center support bearing that has rubber mounting for the bearing. This rubber gives over time and allows the shaft move down. This made the shaft U-joint knuckles to rub on the shield when I lift foot of the gas pedal. When car was pulling no noise.
Shaft moves in slightly different position under load changes in the shaft and this is why noise appeared only when coasting.
My fix was to go under the car and pull the shield down some. In my car the shield was made of two pieces and there was a screw in the middle of the joint that I could pull from. The U-joint is close to this point behind cover.
Later I replaced the center bearing and support bracket and then the car was totaled, but that is another story…
I found matching replacement so I’m still driving the gorgeous W221.
