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Originally Posted by chris_flies

Sounds relatively normal. I have F30 335i brakes on my 128i (4 piston Brembos, similar to the 135i brakes) and there is a little uneven pad wear (maybe a mm difference inside to outside) after a track day (probably the grease I applied breaking-down and becoming ineffective in the heat).

Not nearly as bad as my dad's Mk7 GTI and the OE pads. The pads were so tapered after just one day (not even a weekend), that there was almost a cm difference from one end of the pad to the other, and they were so incredibly chunked-up (his look was a little priceless after he saw them lol). Now he's converted to the Porterfield R4 and R4-S rotation regime that I use and love. They are really good pads...

The similarity between the F30 and 135i is that they are fixed calipers, not sliding as on the 128i. The 135i has a 6-piston Brembo though, as opposed to 4.

I'm sure you meant the pads wore 1mm, not cm as they don't have that much worth of material from new to completely worn.