Sorry everyone - was away with work. I've replied to PMs.
Originally Posted by bmroxm5
135 brakes are cosmetically great and the only BMW brake that's a monoblock design.
The rotors are of a slightly smaller diameter than the 335s but you do get 6 pistons.
Probably not a worthwhile upgrade for a 335, definitely a worthwhile upgrade for everything else.
The front rotors are plug and play with most 18" wheels and above.
To fit the rear caliper and everything, you're looking at ~$500 labour and a new handbrake shoe (~$100 iirc)
OK - I need to correct my initial post, front axle stuff is Aussie 135 as are the rear 135i calipers. The rear is 'merican 128i - therefore slightly different part numbers (though should be interchangeable with 125/123 - I got them from Turner Motorsport that assured me they would fit, but I never got the chance to try)
The calipers aren't coming up in Real OEM, but they came in this kit:
Remember, the rear calipers come with un-used brake pads.
Hope that helps.