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      07-22-2018, 09:54 AM   #1
JHZR2
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Rear brake noise with light pedal pressure - re-chamfer?

My 2011 135i has original brakes. While under warranty, I noted to the dealer that the rear right brake sometimes made a squealing noise under light pressure. They (added?) chamfered the pad and put it back together. Now, maybe 10k later, itís happening again.

Has anyone else experienced this? Best explained as only happening when cold with light pressure under initial contact. Under hard braking, multiple braking instances, etc., it doesnít occur.

Is a re-chamfer if the pads really appropriate or is another approach recommended? If it was lubrication, Id think the others would also be noisy?

For pad removal and re-installation, are there any bolts that are use once and replace?

Thanks!
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      07-23-2018, 06:21 AM   #2
beattiecj
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Could be several things, if it really bothers you I would get a new set of pads for what it's worth. It also could be buildup on the rotor if it's been sitting for awhile and that goes away after a few stops, this is usually rust or dirt not a big deal.

Replacing the pads:
Jack the rear up and remove the tire, there are two pins in the caliper that need to be pressed out and then the spacer that the pins hold in place. After that pull the pads out and re-insert the new pad, spacer and pins. There are no one time use items. You may need to press in the caliper piston to make space for the new pads fit, this can be done by hand.

Just make sure you put the spacer right side up or you will have an insane squeal.

Hope that helps
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      07-24-2018, 08:06 PM   #3
JHZR2
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Thank you - thatís great! A pad slap without rotor resurfacing has come to mind, but the chamfer worked last time. Thing is, there has to be some other systemmatic issue that causes this to happen twice with the same pads, which arenít showing a ton of wear (though they dust like mad).

Thatís why I have to wonder if itís lubrication somewhere.
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      09-06-2018, 05:52 AM   #4
juld0zer
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BMW sells a brake pad paste. Apply it to the metal to metal contact areas.

I had the same problem as you. I solved it by sticking about 40g of lead wheel weights to each pad's existing weights. So 20g per weight. It works like Dynamat to a door. You change the frequency of the vibration to one that is pretty much inaudible.
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