My brake upgrade completed as follows:-
Calipers
- Front - swapped std blue m sport to larger F30 Oe blue m-sport calipers
- Rear - no change
Discs - all round OE MP BBK discs c/w OE larger protection plates
- front [370mm]
- rear [345mm]
Pads c/w new wear sensors
- Front - OE M3/M4 sport pads;
- Rear - OE MP pads at the rear
Lines - HEL ss braided hoses - black
BF - DOT 5.1
Pad break-in ritual as follows to get the disc and pad temperatures high enough to ship pad material evenly to the disc faces:-
- Light braking to warm the pads and discs.
- 8-10 hard stops*, 60-5mph in quick succession.
*Hard stop = getting to the point of ABS intervention, but not actually triggering.
- Brake pressure must be released as you approach stop - do not stop the car after each deceleration.
- Repeated above with some higher speed deceleration, say 80-10 on a private closed road......
- Drive for several miles afterwards to let the brakes cool.
The std car's brakes are very good - I think EU spec M135i pads are superb for DD and occasional track work - so the m2/m3/m4 sport pads were a leap of faith. However, although its early days, so far no noise but wow can this thing pull up...pedal feel is definitely improved [I have yet to get the DSC/ABS recoded which I think will soften the pedal a tad] with great initial bite but still progressive and easy to modulate [important to me and I was concerned that I might make the brakes too binary].
BP
461m trial fit
Front
usual 397's
Front
Rear
