Originally Posted By: JHZR2
My 135i has an official curb weight of 3638lb, IIRC.
It has six piston Brembo calipers in the front, two piston in the rear.
I'm ashamed to show this, but after about 400 miles of mixed driving, and endless rain preventing a wash, this is the outcome...
The car has around 21k miles on it. All mixed driving.
Here are the measurements on the OE pads:
Rear:
Front:
I can't complain.
These six-pot brembos have ceramic pistons apparently can warp with excessive heat. Various companies sell metal pistons for refurbishment. Apparently the rotors are thinner than E90 M3 rotors so get hotter and transfer more heat to the caliper. The M3 brakes have fewer pistons, but I'd prefer more rotor than more caliper. When they get replaced it will probably be two piece rotors.
For pads, here are the replacement costs with lifetime warranty:
Textar FE rated pads and Zimmerman rotors:
Stupid question - how do you best assess the backside pad thickness with the car on the ground? I can't imagine these "courtesy checks" remove all wheels.
This is why Akebono pads are awesome, because they won't dust like that
The best way to assess the inner pad thickness is to assume it's the same as the outer pad