schmick325

I have an 07 w164 ML63 and it's started to make a metallic squeaking noise, very similar to brake noise but this happens when driving in a straight line. Applying the brakes makes no difference.

The noise goes away when cornering but comes back as soon as the car has straightened up again.

Any ideas??

It's going to the dealer tomorrow

Vernl

You dont say how many miles are on the pads.Assuming they are new enough not to be the cause, it happens once in awhile that a tiny rock can land up on top of the brake pads and sit there in the taper of the pad and be forced in to make a squeal as the wheel turns. When it happens to me, i head to the carwash and it fixes the problem.

schmick325

Pads and rotors are only about 10000 klms old. Pads have alot left on them.

I took it to Benz this morning and the foreman went for a spin and said he though it was a stone as well. They will check it all out.

It needs the park brake adjusted as well and there is a tensioner noise on the front of the motor as well that they can have a play with, otherwise I wish I'd seen your post before I'd left. I've got a Karcher high pressure cleaner in the garage!

schmick325

Unbelievable,

About 2 months ago I had a missing wheel bolt in the right rear. So i went to Benz and bought another one. Turns out the one I got was too long and it has started rubbing on the park brake mechanism inside the rear disc, causing this metallic chirping sound I have been hearing.

Very strange as I thought it was coming from the left front!

Could have been worse.

Vernl

If you gave the dealer your vin to access the wheel bolts part number and he gave you the wrong one, they will fix your brakes for free, but they wont unless you mention it to them