Are you saying these PBK calipers and the 135i calipers are of different quality? I was under the impression they are identical it is just that the PBK calipers are painted yellow instead of grey. Only other difference is if you order the PBK kit you get the drilled slotted rotors rather than plain disks? If there are differences in the calipers please elaborate for the benefit of the rest of us (which one is better/different and why) or point me in the direction of a post I missed.Since this thread is dealing with the BMW Performance Brake Kit:
Beyond these, there is a direct replacement super-high performance rotors that are direct fit from RB if you need a full floating rotor for extreme track use. There are plenty of aftermarket pads available since these kits are becoming more widely used and I believe they are identical to the stock calipers on a 135i in size (but not equal in quality)
Any other questions?
What m3, e36, e46 or e90/92? I ask because e90/92 M3(and the 1M coupe) use a single piston floating caliper design with 360x30 rotors, while the e39 M5 is 345x32 and PBK/135i is 338x26 for comparison. Not sure this kit would be an upgrade for the e90/92 even if PBK is a fixed multipiston caliper. Perhaps there were reasons other than for performance, but BMW did put M3 brakes on the 1M coupe not PBK/135i brakes.A friend did this on his M3 and he strongly suggested to not do it. He claimed performance was very poor and upgraded to a proper setup.
Regardless, if anyone wants to try it I'm sure I can get some brackets built.
Got any more specifics about the poor performance? It would be helpful as several members have tried this set up on e39s and all have been very happy with the results.