urluzn2

Im wondering if the A8 312x25 rotor is the largest i can use on the bira1 system? Ddo you have to change calipers to go bigger? Can i use the boxster brackets that i have now with say a 993 or 996 caliper? Basically i want to upgrade to the largest size without going to the custom rotor/hat setup. Say the S8 323x30 rotors. Is there much of a difference between the boxster(nonS), 993 and 996 calipers? Just still need to fit under 17s for the winter. Lots of question, just dont know my options,. Thanks.

lloyd21

Opt#1-If you want to use the BIRA system then you need to use the 312 rotors with the Boxster calipers & brackets.

Opt#2-If you want the biggest brakes *known* possible then you need a special caliper bracket to let you run Cayenne 6-pot's with 330mm Mercedes disks, but you *may* possible kill your bias.

Opt#3-If you want to use your 17's you could use the RS2 brackets with A8/S8 323mm X 30mm rotors with 993TT/928GTS calipers as long as your offset allows it.

In the past most have done Opt#3 and were happy with the results

UrS4boy

BIRA System 1 brackets ONLY work for Boxster calipers and A8 312 x 25 rotors. All other options you suggested need different brackets and rotors as Mr. Lloyd points out below.

AndrewWK

If you are talking about the silver avant, it has Bira System 3 already, which uses a 314x30mm euro A8 rotor and 996 Carrera caliper

urluzn2

I saw a DIY, showing that you can use up to the 323x30 rotors with these calipers, the pad just doesnt cover the edge closest to the rotor hat. Your opinion? I want to do this soon, lots of shaking when braking.

bluevr6

if it doesn't increase the friction area (pad size does not change), and increases sprung wieght, why do it?

urluzn2

Ok, bringing this back up. So i know i have the Bira stg3, 314x30 with Porsche monoblocks. Im trying to get rotors, specifically Adam's rotors from Audizine(the dimpled, slotted, coated ones). He is having a hard time finding blanks in this size and for a good price to even come close to his normal advertised prices. I have read that 99 A8 are 314x30, but everytime i search parts places, they show a 312x25. Is there another rotor that is easier to acquire. Looking the 314x30 p/n (441 615 301 AA)on ecstuning site shows it $160/set which is only 80$ more than a set of B5s4 rotors. Is it that hard to find these??? Help me out!?

4x5x5

I don't understand your question, you say you have found them, but then say they are hard to find?
441 615 301 AA is a Euro market application but avail here. I paid $110 a set a while back when the $ had some value. 4D0 615 301 A would be identical dimensionally except that it is 323mm diameter vs 314mm.