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Well, one way is to use an obscure tool. They have a special big bucks Audi adapter for it that multiplies by 25.4:
Besides that, well, 385mm was used only on W12 and S8. They use same calipers as the 4.2, but brackets are different to deal with the larger rotors. I only know of one case where brackets were changed on a 4.2 to use the larger rotors--on Misha's car that still lives here on the board.
+1, call the dealer, give them your vin and they can give you the part number in return. From a quick glance it appears the 385's are correct, I would not order a thing without being certain though.
+1, call the dealer, give them your vin and they can give you the part number in return. From a quick glance it appears the 385's are correct, I would not order a thing without being certain though.
385mm on your W12 from the fleet listing. Looking at OP's post, it's not 100% clear to me which motor he has. I inferred 4.2, since rear rotors that he alludes to at 310 mm by some measurement would in fact be 335mm on a W12 or S8--that inch difference should be pretty obvious with Mr. Stanley. Motor answers the rotor size question in any case on a 1:1 correspondence. There were no "special performance" type optional brakes from factory, other than Euro only CCB's. If someone modded a 4.2 (like Misha did) by changing the caliper brackets on a now dozen year old car with 3-5 owners not uncommonly, then measuring it in field is needed. 99%+ probably still stock though for an A8.
Well, one way is to use an obscure tool. They have a special big bucks Audi adapter for it that multiplies by 25.4:
Besides that, well, 385mm was used only on W12 and S8. They use same calipers as the 4.2, but brackets are different to deal with the larger rotors. I only know of one case where brackets were changed on a 4.2 to use the larger rotors--on Misha's car that still lives here on the board.
Interestingly, I just ordered new rotors, and had to use that same exotic tool to be sure I ordered the right ones. They arrive tomorrow. They are an inch wider than the standard ones, so even with some small measuring error, it should be pretty clear.
05-29-2018, 05:57 PM
How do I know front rotor size
