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Not sure if this works for you UK/Euro types who have UrS4/S6's with HP2 brakes from the factory but for us North America types (Canada and the US) with Girling G60's, the brake up grade was Porsche 993tt (or 928GTS) big reds/big blacks using RS2 brake caliper brackets and A8 323x30 rotors. These fit under the OE 16" UrS4 and UrS6 wheels.
A list of the PNs for this are given here (note, this works for the North American cars, your HP2s hub carriers are different):
Not sure if this works for you UK/Euro types who have UrS4/S6's with HP2 brakes from the factory but for us North America types (Canada and the US) with Girling G60's, the brake up grade was Porsche 993tt (or 928GTS) big reds/big blacks using RS2 brake caliper brackets and A8 323x30 rotors. These fit under the OE 16" UrS4 and UrS6 wheels.
A list of the PNs for this are given here (note, this works for the North American cars, your HP2s hub carriers are different):
HP2 brakes can be upgraded to Cayenne 6-pots without new brackets (?) but I don't know if they fit under 17" wheels.
Euro UrS cars have different struts to US cars, bigger bolt spacing so RS2 brackets dont fit, i have made some brackets to suit boxster s calipers/S8 disks but not finished them yet.
cayenne callipers with 330mm discs fit right under the S6+ wheels. Small clearance needed on the ball joint. Modified bolts to the calipers. Other than that bolt straight up and the original lines fit too. Got a set in the loft at the moment and one day I'll get round to fitting them. Just be careful when investing in Cayenne calipers as there is two types out there. You want the radially mounted ones that line up with the original bolt holes on the hub. the other type require adapters.
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
The detailed post showing the triming of the bearing housing and the caliper:
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
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