Front Wheel Metel on Metal Squeal
07-22-2018, 03:10 PM
#1
Member
Thread Starter
Front Wheel Metel on Metal Squeal
2012 C350. 48,000 miles. Out of the blue an extremely loud metal on metal like squeal came from the front left wheel. First noticed it at very low speed (5 mph) with car moving forward at idle speed. Not depressing brake. Sound goes away after 10 seconds. Happened next day again with car/brakes cold, and then again after car was driven. Always at low speed.
Took car to very trusted mechanic who pulled brake pads, which were OEM installed 15,000 ago by dealer during Certified PreOwned Prep. Brake pads had very little wear but the pads were cracked and flaking at the edges. We did not pull the rotors, visually they looked OK. Braking performance was normal and did not pull to the side or squeak (except as described above.)
Mechanic replaced pads on both front wheels. After that, all seemed well, no squeaks/squeals or abnormal sounds.
Fast forward two weeks. Damn sound came back after a 5 hour drive. Just as bad as before.
Fast forward one month. Did not do anything after the one time return of the squeak. It’s now been one month, no squeak.
Below is a link from the W219 forum of a member who appears to have a similar problem.
https://mbworld.org/forums/cls-coupe...ide-wheel.html
Any thoughts as as to this problem?
Took car to very trusted mechanic who pulled brake pads, which were OEM installed 15,000 ago by dealer during Certified PreOwned Prep. Brake pads had very little wear but the pads were cracked and flaking at the edges. We did not pull the rotors, visually they looked OK. Braking performance was normal and did not pull to the side or squeak (except as described above.)
Mechanic replaced pads on both front wheels. After that, all seemed well, no squeaks/squeals or abnormal sounds.
Fast forward two weeks. Damn sound came back after a 5 hour drive. Just as bad as before.
Fast forward one month. Did not do anything after the one time return of the squeak. It’s now been one month, no squeak.
Below is a link from the W219 forum of a member who appears to have a similar problem.
https://mbworld.org/forums/cls-coupe...ide-wheel.html
Any thoughts as as to this problem?
Last edited by RNajarian; 08-21-2018 at 08:02 PM. Reason: Update
09-23-2018, 08:27 PM
#2
Member
Thread Starter
Update:
Two months later, about 2,000 more miles on odometer and I am frustrated to report the squeak returns occasionally, from same front driver wheel. When they removed the brake pads after the initial visit to the mechanic I was shown the top of the brake pads which were peeling away in sections ranging from 1/2 cm wide and about 1/4 cm deep shaped like a triangle. There were three maybe four of these breaches.
I suspect the part that is causing the squeaking is likely a defective or possibly slightly warped rotor. The rotors are drilled and I wonder if one of the holes is maybe somehow causing these triangular shaped defects.
When the squeak returns what I have been doing is driving about 20 feet with a foot on the brake and the other on the accelerator. Of course I’m doing this in a parking lot and not on the freeway. The reason is that I’m thinking with the brake depressed and the car moving it may break these little defects of the pad off. After doing so the squeak stops. . Whether it is related to my actions or not I do not know. I am due for an oil change so at that point I may have them pull the rotor and turn it and see if that helps if not I am quite frustrated as to this annoying development
Two months later, about 2,000 more miles on odometer and I am frustrated to report the squeak returns occasionally, from same front driver wheel. When they removed the brake pads after the initial visit to the mechanic I was shown the top of the brake pads which were peeling away in sections ranging from 1/2 cm wide and about 1/4 cm deep shaped like a triangle. There were three maybe four of these breaches.
I suspect the part that is causing the squeaking is likely a defective or possibly slightly warped rotor. The rotors are drilled and I wonder if one of the holes is maybe somehow causing these triangular shaped defects.
When the squeak returns what I have been doing is driving about 20 feet with a foot on the brake and the other on the accelerator. Of course I’m doing this in a parking lot and not on the freeway. The reason is that I’m thinking with the brake depressed and the car moving it may break these little defects of the pad off. After doing so the squeak stops. . Whether it is related to my actions or not I do not know. I am due for an oil change so at that point I may have them pull the rotor and turn it and see if that helps if not I am quite frustrated as to this annoying development
09-24-2018, 10:17 PM
#3
MBWorld Fanatic!
Sounds like your mechanic is not doing a thorough investigation into your problem. I would take off both wheels and rotate the rotors while straight and when turned. It sounds like it only happens when the wheels are in motion, so I would start there.
09-25-2018, 09:20 PM
#5
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Join Date: Nov 2016
Location: Richland, WA
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2015 C250 Coupe
Could be dust. I had the same thing happen with my rear driver's side wheel. Took the wheel off and removed the pads, wiped pads and rotor down with a clean rag and re-installed. Haven't had much issue since, although it does come back from time to time.
01-03-2019, 09:39 AM
#6
I have the same squeaking noise on my 2013 C250 sport when driving very slow and when barely moving after being stopped. Also when driving up a hill or incline at slow speeds. It happens when I let off of the brakes, so I am not sure what the noise could be coming from but it doesn't sound good and is very annoying.
01-06-2019, 12:08 AM
#7
Member
Thread Starter
I haven’t had my squealing problem for some time. I suggest this, next time it happens, park the car and let the rotors and brake pads cool down. The take a hose and squirt the $#!+ out of them, rinse off any brake dust, slowly drive off and see if that makes a difference. I’m thinking my problem is brake dust, but if anyone else has any ideas I’m all ears.
