Dan J.

Hi,

What is the minmum rotor thickness for the stock C2 brakes? Front & Rear

Many thanks!
Dan J.

Wachuko

If I remember correctly... wear of 2mm and they need to be replaced

Wachuko

From a post from Bill Gregory...

"New, front rotors are 28mm. Minimum thickness after machining is 26.6mm. The wear limit is 26.0mm. The reason that turning the rotors isn't typically recommended is that you reduce the amount of metal to act as a heat sink, which is important at the track, to deal with heat. "

ilko

Your rotors have the minimum thickness info stamped on the hubs. You may be able to see that without taking the wheels off (unless you're running D90's).

MisterRisky

The fronts are easy to remember: about 1 inch. Actually 26mm is 1.02 inches and 28mm is 1.10", but 1 inch is dang easy to remember.

Adrian's book says 28/24 f/r is minimum for 89-93 C4 and 90-94 C2

if you have RS, Turbo, or Turbo look, things will vary. See page 246-247.

Dan J.

Hi,

Thanks for the replys. So what I'm reading is that the New Thickness = 28/24 and 2mm wear is maximum.

Also, minimum thickness is stamped on the hubs. I'll look for this.

I'm now shopping for new pads and want to order up rotors at the same time if necessary.

Thanks all!
Dan.

MisterRisky

You are totally correct even though that's not what I typed above. Sorry about that. 28mm front and 24mm rear is, indeed, the new thickness not the minimum as I stated above.

26mm front and 22mm rear are the minimum measures.

chancecasey

Your shop that turns the rotors will have the correct data for your car - and will tell you if they think they can be turned or not. Don't waste your time second-guessing the shop with your calipers and such, just take them in and ask them to tell you whether or not they can be turned. My shop said they weren't sure, I said do it anyway and got a little discount because they came out slightly thin, but I just kept them in case I need a convenient temporary spare.

blake

Thanks for posting this question Dan J... I was wondering the same thing as I need to replace my C2's front rotors soon...

As usual, the Rennlister Community is great at providing factual information FAST!

Thanks!
-B