Squeaking brakes

Dilaro · #1 06-16-2010, 03:07 AM

I still have squeaking brakes when I changed in to new pads. They did not make any success.

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JCL · #2 06-16-2010, 12:24 PM

Did you do the job yourself, or have a shop do it?
Are the old pads stock, or aftermarket? How about the new pads?
Were the rotors changed, or left alone?
Are the anti-rattle clips in the pads tight?
Has high temperature grease been applied to the ears of the pads where they touch the calipers (isolates the pads, so when the pad vibrates the resulting noise can't be transmitted to the caliper).

Dilaro · #3 06-24-2010, 08:35 AM

Quote:

Originally Posted by JCL

Did you do the job yourself, or have a shop do it?
Are the old pads stock, or aftermarket? How about the new pads?
Were the rotors changed, or left alone?
Are the anti-rattle clips in the pads tight?
Has high temperature grease been applied to the ears of the pads where they touch the calipers (isolates the pads, so when the pad vibrates the resulting noise can't be transmitted to the caliper).

The Dealer did it (BMW). Stock pads. I have no idea about your other questions. But I can check it out.

JCL · #4 06-24-2010, 12:00 PM

If you paid to have it done, just take it back and tell them it is squealing. If they didn't replace the rotors when they did the pads, then they should have and you may be charged additional for more parts. If they did replace the rotors then they should consider it labour warranty/redo, since new pads and rotors should not squeal.

Dilaro · #5 10-03-2010, 03:07 PM

The dealer have no clue what is squeaking, they've changed everything with the brakes.
This squeaking sound comes sometime. It can be irritating

BGM · #6 10-03-2010, 03:48 PM

The squealing is an inherited trait it seems even in my old e53. Mine would when applying the brake at parking lot speed but goes away as you press the brake pedal all the way to the floor---it's like a mid-range pressure. I've heard different stories as to why even heard when you use some spray wheel cleaners they will reduce some layer of coating on the brake that is there. Bottom line is it will always be there and brake performance is not affected by it.

alexmish · #7 10-03-2010, 06:04 PM

You have to bead the new pads in.... Accelerate to 60 mph and rapidly slow down to 5 mph (but dont stop!), repeat for 6-10 times immediately after (find a long empty stretch of highway, like an early morning). The idea is to transfer pad's material onto the rotors, and then noise will be gone.

JCL · #8 10-03-2010, 07:06 PM

I wouldn't recommend doing that. It has stock pads, not aftermarket pads, and it was repaired by the dealer.

If you get it good and hot, the dealer will see the signs of heating up the rotors and pin it on the owner. Better to just take it back to the dealer, who was paid to do the job, and insist that they fix it right.

Xtony · #9 10-03-2010, 08:03 PM

Quote:

Originally Posted by JCL

I wouldn't recommend doing that. It has stock pads, not aftermarket pads, and it was repaired by the dealer.

If you get it good and hot, the dealer will see the signs of heating up the rotors and pin it on the owner. Better to just take it back to the dealer, who was paid to do the job, and insist that they fix it right.

I can hear the dealer now: " ...the brake squeal is a normal feature of the precision engineered JOY brake pads and is to be cherished".

I agree with bedding the pads. Don't have to be too aggressive as with track pads, but you do need to transfer some pad material to the rotors.

BMW does not put any anti-squeal on at the factory, so I don't think they put any on at the dealer either so if they still squeal after bedding them in, you might want to put some anti-squeal on the contact surfaces of the pads.

JCL · #10 10-03-2010, 10:12 PM

Sounds like some bad dealer experiences in Georgia.

BMW doesn't use goop on the back of the pads at the factory, and it shouldn't be necessary now. IMO, it is often used as a bandaid fix, reduces pedal feel, can be a temporary fix, and is often resorted to when owners or mechanics don't pay attention to the rotor surface finish.

BMW does use high temperature grease on the ears of the pads where they touch the calipers, and mechanics should do so as well.

The original poster didn't do the brake job, and so is unlikely to be doing the redo. I would go back to the repairing dealer, tell them that the noise is unacceptable, and give them a chance to fix it. If they can't, I recommend the OP goes to another shop.

We don't even know that it is the brakes. The noise was reported to be there before and after the brake job.

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