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Discussion Starter #1
Hi Everyone,

I just had my 02 M5 in for an Inspection I service and while it was there I complained that the front brakes squeak when hot. Usually this happens at lower speeds - say from 20-0 mph. The techs checked the brakes and found no problems. They were unable to reproduce the squeak, much to my shagrin.

I searched and couldn't really find much on this problem. The pads have about 60% of their life left - the rotors are clean and don't feel grooved to the touch, and I'm obsessive about brake dust build-up so my wheels are almost always clean.

This only seems to happen when driving in city traffic - probably because that's the only time my windows are down for me to hear it, but slowing from 60-30 will produce no noise - however anything under that and the vehicle screeeeeches until stopped. No pedal fade - no warped rotor feedback.

Any thoughts?

Thanks,

Matt
 

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DZeckhausen said:
Try bedding the brakes. That usually cures the squeaky problem you are describing. Instructions for doing this may be found here: http://www.zeckhausen.com/bedding_in_brakes.htm
Thanks for this. So by performing this to my car's braking system, am I effectively taking a layer of glaze -or whatever- off the pads and "starting from scratch?" They seem to bite just fine, they're just noisy as hell when they're hot - so I guess I don't see how getting them hotter will solve the problem.

Thanks -

Matt
 

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matt310 said:
Thanks for this. So by performing this to my car's braking system, am I effectively taking a layer of glaze -or whatever- off the pads and "starting from scratch?" They seem to bite just fine, they're just noisy as hell when they're hot - so I guess I don't see how getting them hotter will solve the problem.
You aren't removing glaze from the pads. You're adding a transfer layer of pad material to the surface of the rotors. This allows your brakes to take advantage of an additional type of friction known as "adherent" mode. And it usually quiets down squeaky brakes.

See: http://www.stoptech.com/whitepapers/warped_rotors_myth.htm for more background information. This one will help too: http://www.stoptech.com/whitepapers/bedintheory.htm
 
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