Metal on Metal scraping sound when braking - MINI Cooper Forum

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post #1 of 9 (permalink) Old Jan 4th, 2013, 07:00 AM Thread Starter
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Metal on Metal scraping sound when braking

Hi,

Before you all jump at me saying I have completely worn down brakes and I had to replace them immediately etc. let me first say that I have checked the servicing history and the brakes have been replaced less than 5.000 miles ago, by the previous owner. It was the rear brakes, and that's exactly where I can hear the sound from at low speed braking. The sound is probably there at higher speeds as well but cant hear it.

I just went to Budapest and back with the sound, and the car behaves perfectly normal, and brakes great.
The rotors had a superficial layer of rust when I got the car, but it dissapeared after a day or two.

I checked the brakes, and this is what I see.
The brake pads seem pretty thick and seem to have quite some "meat on them". The rotors are somewhat darker to the outside of the ring, like a dark blue color of some sort.

The scraping sound is not very noticeable, but it can be heard.
(my car is a 2009 r56 non-s)
Thanks to everyone in advance for any helpful tips or ideas.
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post #2 of 9 (permalink) Old Jan 4th, 2013, 08:26 AM
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Have you lifted the car and checked if the wheels run freely and are not tight when rotated. The 'blueing' of the discs would indicate over heating. Could be hand brake not fully releasing.
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post #3 of 9 (permalink) Old Jan 4th, 2013, 09:29 AM
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Rust on the brake disks. Happens to me all the time. It wears off, but comes right back if the car sits overnight even if the humidity is only slight.

I gave up worrying about it. You can always change for better brakes.
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post #4 of 9 (permalink) Old Jan 4th, 2013, 09:30 AM Thread Starter
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Quote:
Originally Posted by Dermottdog View Post
Have you lifted the car and checked if the wheels run freely and are not tight when rotated. The 'blueing' of the discs would indicate over heating. Could be hand brake not fully releasing.
Havent lifted it up. Will do so as soon as I can and see the results.
Thanks for the tip!
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post #5 of 9 (permalink) Old Jan 4th, 2013, 09:33 AM Thread Starter
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Quote:
Originally Posted by MiniDeLux View Post
Rust on the brake disks. Happens to me all the time. It wears off, but comes right back if the car sits overnight even if the humidity is only slight.

I gave up worrying about it. You can always change for better brakes.
I suspected that as well. But if its superficial rust, than the noise should go away after a few hard brakes and some city driving. To me it looks like that sound stays. I will try driving long and do some harder braking and then go somewhere quiet to check and compare with the sound at the beggining of the run.
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post #6 of 9 (permalink) Old Jan 4th, 2013, 11:03 AM
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Hi ya

dont know if this will help i have had this on a couple of cars if you look at this link
RealOEM.com BMW R56 Cooper Rear wheel brake-brake pad sensor

item 8 is your brake pads if you look above the pads and below there are two metal plates, i have seen it where these have moved due to the locating tangs being bent or broken and causing the plate to rub on the disc where the plates have moved.


hope this helps
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post #7 of 9 (permalink) Old Jan 4th, 2013, 04:36 PM
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Its easy to check if its connected with the handbrake linkages not freeing off completely.
When you hear the noise just pull the handbrake up very slightly and see if it stops the squeak??
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post #8 of 9 (permalink) Old Jan 4th, 2013, 08:37 PM
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Sometimes the pads get glazed over and it will sound like metal on metal...
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post #9 of 9 (permalink) Old Jan 5th, 2013, 08:04 AM Thread Starter
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Took it to the mechanic yesterday.
They lifted it up, did some minor check ups, spinned the wheel, looked at the handbrake etc.
They asked me if the car was sitting somewhere for a while, not being driven that much? As a matter of fact it did, before I bought it, it was at the dealers for a 2 months or so. (Used car).
They told me that the rotors have a bit thicker layer of rust because of that, that will take some time to be removed by daily driving. They told me this is no hinderance or problem for the car at all, and that I can replace the rotors if the sound is annoying, which it really isnt at all.
As soon as I got there they touched the disks which were almost cold. So they concluded theyr not overheating.
And thats pretty much it. Glad I dont have to do anything major.
Thanks to everyone for your inputs and help!
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