Originally Posted by M3SQRD
Look at the last pic in the post below:
This is typical of all BBKs that retain the stock e9x M3 rear parking brake - the parking brake shoe is preloaded against an anodized/chemical-coated Alum drum. I'm running the Performance Friction BBK and I find the parking brake holding power to be very similar to the stock setup.
Thanks for the info and pics. I'm just surprised it's an aluminum hat.