928Myles

Hi,
looking at a set of front rotors (322mm) and calipers from a 993 tt. What would I have to do for these to fit the front of my S4? The rotors are drilled and 27.5mm thick so slightly thinner than std S4 rotors.

Would this be a worthwhile upgrade over the stock brakes (street use)?

Cheers,
Myles

andy-gts

Ask roger, I think the ones I bought from roger for the gts were 993tt and were a fit but there was some machining needed that roger had done before the sale.

Cheburator

993TT discs will not fit as the hat has a different offset to the GTS/964 Turbo 2 discs. Use them unless you want to go down the route of custom hats and 2-piece 993TT rotors. I personally use the 964 Turbo 2 rotors. There is a discussion here - use the search engine. 17" wheels clear the 993TT/928GTS rotors and calipers with no problems. Standard Porsche 928 16" wheels don't...

993TT/928GTS calipers and discs are a great upgrade...

928Myles

Thanks for the replies.
So the rotors are no good as a bolt on but the calipers would work with GTS rotors as a bolt on.

Is this correct?

Cheers
Myles

SharkSkin

Correct. The rotors would bolt on to 78 spindles for someone doing that conversion, but they are not properly huub-centered; you would need to use the flathead screws to hold the rotors centered for assembly and double-check runout before putting it together.