I recently had new brakes put onto my 240D (maybe 1000 miles ago) . Recently when i am driving down the road at around 40+ MPH i hear a high pitch squeal coming from the drivers side front tire.

If I tap the brakes, it goes away for a few second, but comes back. If i hit a bump it will also go away for a few second. It only does it when i am going at a consistent speed above 40ish MPH.

Is something loose on the brakes that is causing this? Any other ideas?

-J

either you have a pad dragging or maybe something up with the bearing. but seeing as you had the breaks done, I'd lean more towards the brake dragging

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Sound like the brakes to me, wheel bearings don't usually make a "high pitch sequel." I would bring it back to whomever did they breaks and have it checked.

we had a bearing on our old tahoe that went kershotz and it squealed and ground, only reason I suggested it

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed

Check that the brake backing plate has not gotten bent and is now touching the rotor or that there is a piece of gravel of something between the backing plate and the rotor.

*if* it was a bearing, would just touching the brakes very softly (not even enough to slow down the car) stop the squeal? Because it does stop it, so I am assuming it has something to do with the brakes.

no.
silence from a touch, has to be pad/rotor issues.
when you changed the pads, did you clean the caliper area where the pads slide? did you grease the area?
did you apply pad glue to the back, to keep the pads still? are the pad backing plates in place? did the caliper seals look damaged?
how did the rotors look? any grooves or cracks?

My *trusted* Mercedes mechanic did it.

I will just take it to the local brake shop and have them take a look. Thanks!

I'll bet a nickel that they did the pads but not the rotors...the rotors have grooves from the old pads and the new ones ride on those grooves and squeal. Touching the brake makes better contact so it stops squealing but it returns as soon as the pedal is released. Could also be ceramic pads were used which are harder than the organic ones normally used.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz

Is that a sarcastic *trust*? If not, I suggest taking it back to the shop that did the work. I'd think they'd correct the problem without charge. Sounds like a pad issue.

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1982 240 D, 308,000 - 321,127 miles (sold)
1982 300 TD,166,500 - 226,000 miles
1998 E 320, 120,000 - 144,000 miles
2005 C 230 K, 26,000 - 77,000 miles (sold)

Check the little spring clip that holds the pads in, sometimes the spring is too big and will scratch the outer edge of the rotor. I had this happen on my SD. Had to grind down the edges of the spring clip slightly to stop it from scraping.

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I wouldn't rule out the bearing. If the rotors were replaced, couldn't the bearing have been over tightened, when the rotor was reinstalled? I have had wheel bearings go several times over the years, and they always let me know by making a high pitched noise. It can be dangerous, as a frozen bearing can damage the spindle. Sometimes it can cut the spindle right off. Get it checked right away to rule out a frozen bearing. Good Luck