No, not brake sensor, thats a completely different animal. It must be what you are referring to as the speed sensor-I assumed it was the ABS. BMW call it a pulse generator.
If you're correct in that they don't need coding, and as it is a hall effect sensor then yes I have damaged them, and for the sake of 30-40 bucks each I may as well replace them. Not much point in testing them-getting under the car twice.
Thanks for the input TX5
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Present:
01 X5 4.4i
07 Yam R1
Past:
89 R32 Skyline various mods, running 442 BHP
00 Merc CLK55 AMG
01 E39 M5 Haywood and Scott silencers
02 E46 M3 Supersprint Cats, Eibach Lowered, Thorney Motorsport Remap, running 368 BHP