Quote:
Originally Posted by dc_wright
I've had this on and off with my 3.0si. Two causes so far were pad knock back due to a set of DS2500 pads in the front calipers that wouldn't stay clipped into the pocket in the caliper piston, and a set of AutoZone anti-rattle springs that were too thick and contacted the back of the brake pad pushing against the rotor. Rotors where the plane of the braking surface isn't on the same plane as the surface that mates with the hub can also cause knock back of the pads. Debris trapped between the rotor and the hub can also cause it.
If you've changed pads on your Z4 you've probably seen that it takes 3-4 full strokes of the brake pedal to move the pads into contact with the rotor. It doesn't take much knock back to cause a need for about 1/2 stroke to get the pads back in contact. The knock back can come from either the front calipers, the rear calipers or both.
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I saw your post regarding that. I'm on those 335i front calipers which don't use those clips but a different style. Yes they were autozone clips as well (but PFC race pads). And, I've switched to 135i rear calipers which are different piston setup. Yes, slightly larger piston than stock.
I looked at the front clips and other than ordering new OEM clips for comparison, not sure they would cause this same issue.
Can anyone here who's gone to BBK confirm that brake pedal travel decreased for the same amount of pressure?