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Originally Posted by burkleymh
BMW designs the rotors to be replaced with the pads and are not designed to be refaced - they are too thin to safely machine down - check out the threads about brakes here - rotor replacement also requires the replacement of the brake sensor - pads (4 sets), rotors(4), and sensors(2) are required for a complete brake job
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BMW may
recommend that rotors and pads be changed simultaneously, but there is no valid design or performance reason to do so, IF the rotors or pads are not at the minimum spec thickness. The reasons they tell us to do them at the same time is to: (1) minimize 'come-back's (rework), and (2) maximize profit.
If you are a DIY brake person, then change rotors and pads when they fall below spec thickness. If your pads wear out at 2X the rate of your rotors (as a % of usable thickness), then you would be wasting hard-earned money to do them all at once. Now, if your pads and rotors are approaching the end of their useful life at the same rate, then replacing pads and rotors at the same time makes good sense.
Following this logic, then the brake wear sensor(s) only need replacing when pads are replaced, and not when rotors alone are replaced.
You are correct that turning the rotors on a lathe is NOT a good move. When they get below spec, replace 'em!
-Dave
07-09-2006, 01:22 AM
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