Brake squeeling when turning... - PeachParts Mercedes-Benz Forum

zu! · #1 07-17-2012, 11:34 AM

I searched and searched and quite frankly, couldn't come up with anything quite like this before...

Now everyone's probably heard of brakes squeeling. But on mine, they also started squeeling when I make a left turn!

This is with no foot on the pedal, and many times not even slowing down by off-throttling. Fast or slow, it happens...and usually after about 15-30 mins of driving. It doesn't happen when I first start off.

I'll be checking pads on the left to have a look, but thought I should check in here too. Theories anyone?

ytmtnman · #2 07-17-2012, 01:43 PM

Perhaps caliper seal. I have heard it said that the caliper piston seals act as a return spring for the brake pads. Worn seals can allow the pads to come in contact with the rotor and could squeal. And drag causing premature brake system wear. I would look for a dirty wheel. One with lots of brake dust. Check that seal first.

vstech · #3 07-17-2012, 02:06 PM

... if it's squeal on a turn, I'd look at the wheel bearings. get a dial indicator set, and measure the play...

Diesel911 · #4 07-17-2012, 03:45 PM

X2 on the Wheel Bearings.

zu! · #5 07-17-2012, 05:22 PM

Wheel bearings eh! Never thought of that. I should add though that the sound is exactly the same as the brakes when it sometimes comes on when braking at the lights or behind slowing traffic. This is why I thought it was the brakes that was somehow dragging on the turns.

The thing I couldn't figure out was what would make the brake drag on turns?

And if its wheel bearings, would they be affected by braking? Perhaps that would explain the squealing at straight-line braking as well?

vstech · #6 07-17-2012, 06:39 PM

oh, it could still be a stuck caliper, or bad brake pad/rotor, but if turning causes the noise to appear, the bearings have to be allowing the rotor to move. hence checking the bearings!

vstech · #7 07-17-2012, 06:39 PM

it could also be the caliper mount bolts are loose... they have to be cleaned and fresh blue loctite installed each time they are removed.

loneranger · #8 07-18-2012, 03:10 PM

If the wheel bearings are loose the wheel will run slighty out of plane with the caliper when going around a corner causing a squeak.

nelbur · #9 07-18-2012, 04:15 PM

I agree that the run out, or movement of the hub relative to the caliper, will cause the pad to contact the disk on a turn. Assuming the bearings are adjusted properly, this is normal and helps back the pads off the disk. The squeaking of the brakes is probably a function of the composition of the pads. If your brakes squeak, you might want to try different pads the next time.