[kolosy]

Originally Posted by bigjae1976

Why? Not sure. E46 data...those who run a front only BBK have seen increased rear pad wear. Might get two front pad changes to every one rear. I get 5-6 front pad changes to one rear with a 4 wheel BBK. My buddy has since installed a rear BBK (stoptech) a couple of years ago and I don't think he has had to change his rear pads.

One common pad setup earlier in the E9X M3 life was a pagid yellow front and pagid black in the rear. The rears would wear as fast as the fronts.

There's some data. I don't know why. Maybe ABS related? I have cracked 2 rear rotors on my E46 although those discs were at or maybe even a tad below the min thickness. I found the cracks by a visual inspection, didn't feel anything. Looks like a heat crack that just spread to the outer edge.

Another data point - if you are wearing out a pagid yellow pretty quickly, it indicates that the pad is overheating. I don't think the rear brakes get much airflow/cooling.

Conclusion? I don't know. Might be ABS related. Could have had a corded or heat cycled rear tire which caused the ABS to activate? Or maybe a track that overheats the right rear tire which caused more ABS activation?

Probably need to ask a nerd that can do brake bias calculations and stuff.

Yeah I’m wondering if the particular bbks you’re seeing change the brake bias and shift braking rearward.