ddcha

I just happened to notice this because I was putting some drilled/slotted rotors on my other car…

Ingenieur

Commonality of parts
Cheaper

m a x i m u s

mine aren't backwards either side. just kidding. what he^^^ said.

jcfay

Shouldn't half be on backwards anyways for when you drive in reverse??? JK, sorry, couldn't resist. Are they really, truly backwards though? I haven't looked at them yet but I imagine that it's done as suggested due to commonality of parts, but also they'll engineer this into the parts knowing this is to be expected. What rotors are you putting on?

Ingenieur

My e46 M3 had side specific rotors iirc
The RS4 had common on the front and specific on the back iirc

jcfay

Yeah, I'd imagine that directional rotors which can better maintain airflow and reduce temps would be better. So with our uniform "cheapos" we'll just see increased brake fade quicker than those with directional setups, but then we should also consider caliper size, vehicle size, etc. I'd care more if I was on the track, probably, but it's certainly interesting.

Tinbucket

Curious. I went out after reading this and looked at my 111 C63 there are right side and left side rotors it appears as to direction of slots and holes.

ddcha

haha. I installed powerstop drilled and slotted directional rotors on my Sienna.