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Old 01-20-2010, 07:40 AM
cn90 cn90 is offline
Officially Welcomed to the 'Fest
Location: Omaha NE
Join Date: Mar 2006
Posts: 14,347
Mein Auto: 1998 528i 5-sp 140K+

The issue of brake pad deposit on the rotor has been discussed multiple times here.

Brake Pedal pulsation is caused by many factors:

- Uneven rotor surface friction coefficient (which may be caused by pad deposit, especially when applying brake pedal when rotor is HOT).

- Warped rotor DOES exist. When I removed my old rotor, it was deeply scored with grooves.

- Another issue is resurfacing the rotor or not. Back in the old days, rotors were more expensive so resurfacing is recommended.
Now, a new rotor is about $40-50 (Resurfacing cost is about $10-20). So the incentive to resurface is less now.

But for the sake of argument, regardless of the causes of brake pedal pulsing, whether it is pad deposit or warped rotor) resurfacing rotor helps smooth things out, but as you know the rotor is now thinner after resurfacing, so it may be warped again sooner than a brand new rotor.

In my experience, resurfacing helps.

This is good reading for everyone.

Last edited by cn90; 01-20-2010 at 07:47 AM.
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