Quote:
Originally Posted by karussell
here is what your list of things to do before and after track day with ccb's
1. jack up car, remove wheel. I recommend a wheel hangar so you don't accidently drop the wheel on the rotor. lift the car only barely enough for you to slide the wheel off without it dropping.
2.use digital caliper and measure rotor thickness. record in log book.
3. inspect front and back of rotor surface for cracks or chips.
4. check brake pads. if they are less than the thickness of the backing plate they need to be replaced. thinner than that and they heat up more further accelerating wear on the friction layer of the rotor.
5. clear out all vent holes in rotors.
6. carefully remount wheel lower then torque
7. check torque again after rolling
bring your jack and everything else you need to remove the wheels to the track. you may need to inspect if you go off, a rock flies in the wheel, you hear any noise in the wheel area.
continue to monitor brake pad thickness throughout the day. visually check front side of rotor for any odd discoloration or damage.
after you get home repeat all the steps above to record new thickness and make sure front and back side of rotors are intact.
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Orrrrrrr ... you can simply have a gander at the handy dandy wear indicators described in the service bulletins mentioned in the
very first post in this thread. Pitting and cracks are a concern, but you can inspect for this without having to remove the wheels by looking and then rolling the car forward and looking some more.
By your standard, you should disassemble the engine after heavy use to check for damage too. Because the engine is important. Just to be safe.
Yes, there is a concern about pitting and chips with these brakes. The same service bulletin seems to suggest that damage from spalling or pitting can be replaced as a defective part during the warranty period. I'm not sure about chips but I happen to think that most vehicle comprehensive policies should cover it, if warranty does not.
We do not have a good data set on problems with chips yet because, in spite of all the fear, loathing and alarms, there do no seem to be any reported problems of this nature with the F8x CCB's. At least not yet. The only reported problem, as far as I know, has to be with the narrow gap between the callipers and the wheel drum with standard 19" rims, where stones can get lodged and scratch the wheels.
Meanwhile, there have been some bad experiences reported at the track and spirited driving with the conventional brakes. Not that they are unexpected.
Melted my stock brake pads in 90 miles
http://f80.bimmerpost.com/forums/sho....php?t=1117355
Stock brakes severe letdown
http://f80.bimmerpost.com/forums/sho....php?t=1028958
F80 M3 brake judder
http://f80.bimmerpost.com/forums/sho....php?t=1038273
Brake callipers changing from blue to green due to overheating
http://f80.bimmerpost.com/forums/sho....php?t=1115447
Granted, the CCB's may be overkill with their larger diameter rotors, additional pistons etc given the available tire friction. But it is not a bad area in which to be over-engineered, no?
Besides they look great, have no brake dust, and provide great pick-up lines when trying to impress the ladies.
