Scrapping sound? - PeachParts Mercedes-Benz Forum

stcbenz83 · #1 08-26-2007, 01:19 AM

Hey all, its been a while.. been super busy this summer with my new career and such.. So heres the scoop, since i travel alot i've had to replace the Mercedes as my DD and go with something that can keep up with highway speeds.And also something less on repairs... So naturally i went with a ricer.. Well actully and Infiniti.. Anywho... so missing the benz the otherday i decided to go for a drive, i start to here this scrapping noise comming from the front tire. It comes and it goes but is usually pretty much always there. sometimes louder than others... Now remembering back a few weeks ago, i did driver her threw a rain storm and she handled really well. So... im not sure if water got into the barrings? the wheel barrings need to be repacked?? it sounds kind of like when you have bad brake pads and are pressing down on the brakes and they make that scrapping noise, only there is no difference in sound whether i hit the brakes or not. Any suggestions on what it could be?

toomany MBZ · #2 08-27-2007, 05:47 AM

Since applying the brakes makes no difference, my bet is on the bearings.

Palangi · #3 08-27-2007, 02:33 PM

Brake shield bent / rubbing on the wheel, or has a rock stuck in it??

toomany MBZ · #4 08-27-2007, 03:34 PM

Quote:

Originally Posted by Palangi

Brake shield bent / rubbing on the wheel, or has a rock stuck in it??

Good point.

patbob · #5 08-27-2007, 07:48 PM

Quote:

Originally Posted by stcbenz83

Hey all, its been a while.. been super busy this summer with my new career and such.. So heres the scoop, since i travel alot i've had to replace the Mercedes as my DD and go with something that can keep up with highway speeds.And also something less on repairs... So naturally i went with a ricer.. Well actully and Infiniti.. Anywho... so missing the benz the otherday i decided to go for a drive, i start to here this scrapping noise comming from the front tire. It comes and it goes but is usually pretty much always there. sometimes louder than others... Now remembering back a few weeks ago, i did driver her threw a rain storm and she handled really well. So... im not sure if water got into the barrings? the wheel barrings need to be repacked?? it sounds kind of like when you have bad brake pads and are pressing down on the brakes and they make that scrapping noise, only there is no difference in sound whether i hit the brakes or not. Any suggestions on what it could be?

Unless by "driging through rain" you mean "fording small streams", then the seals on the bearings should have kept the rain out, as I'm sure they did when it was still your DD.

Since it sounds like a rubbing brake pad, how about.. a rubbing brake pad? Maybe a caliper cylinder rusted and seized since you last drove her?

You're probably going to have to pull that wheel and give the hub a spin to figure out what's causing the noise.

dbn1066 · #6 08-28-2007, 12:08 AM

Are you certain its the front wheel/tire? Just last week, I had the exact same noise you described. Thought it was coming from the front too. After lifting the car and turning the all the wheels, it turned out the sound was coming from the rear- the pins holding the e-brake shoes on one side had disintegrated and vanished. The shoes were rubbing inside the drum. Easy fix. A bad bearing doesn't make that sound.

stcbenz83 · #7 08-28-2007, 01:53 AM

It could be an ebrake... My bet as of now is the wheel bearing from the Front passenger side tire.. My fathers mechanic put some new wheel bearings in and who the heck knows what he put in, probably some cheepo's. Cause last summer durring the summer if i had been driving for a long distance (10-15 miles) it would make the same sound, only alot fainter and after i let it rest for a while, it would be fine agian. This never happened before it was taken to him... But after driving her today to work (feeling bad since she has sat alot this summer) the noise would come and go i'd say with maybe a 30-40 second interval before the noise came back... when i next find time (probably next week some time), i'll put her on the lift and check her out... That and wash,wax, and detail the interior.... The search continues..... i'll let you guys know what i find, keep suggesting though

(just so i have a list of things to go over while im under it)

toomany MBZ · #8 08-28-2007, 05:44 AM

Quote:

Originally Posted by stcbenz83

i'll let you guys know what i find, keep suggesting though

(just so i have a list of things to go over while im under it)

Whole new thread, almost. Check obvious stuff, leaks in rear end and around transmission, exhaust pipe, hangers, muffler, RUST, drive shaft, bearing, flex discs, front end components, trans linkage bushings. To name a few.

patbob · #9 08-28-2007, 01:23 PM

I've had two such intermittant rubbing sounds.. one was the E-brake shoes rubbing, but a little care helped them. Stopping and setting-releasing them would change the sound, but sometimes I had to do that facing up hill and let them take the weight of the car to shift them around.

The other was really weird.. the sense wire on the front passenger side was rubbing on the inside of the wheel. On right turns, I'd get more sounds then on left turns, and it did it more after driving home than driving to work. I was sure it was a wheel bearing because it sounded like a grinding sound when it rubbed. There was also another clue -- in the rain, the brake pad wear light would go on faintly and intemittantly.. but never when dry. Yup, the rubbing had worn through the insulation and it made better contact with the wheel in the rain. I didn't find this until I had the front wheel off to check the condition of the brake pads and noticed the errant wire.

Of course, as far as I knew nobody had touched the bearings recently, but the car was still new to me at the time.

vstech · #10 08-28-2007, 02:18 PM

every wheel bearing I have ever had to change, unless it was TOTALLY MELTED AND DESTROYED... made a thumping sound, not a scraping sound. like tink tink tink tink tink. not any continous sound at all, always a rhythm to the sound.

dbn1066 · #11 08-28-2007, 07:22 PM

It (wheel bearing) must make that kind of sound, consider the physics. Totally different sound when dealing with brakes...the kind of sound described in this thread. I'm eager to wait and see what turns up when stcbenz83 gets the chance to dig into it.