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D4 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc.

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Old 21st November 2017, 09:41 PM
A8 Ian A8 Ian is offline
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Question D4 S8 Disc brake size

Need new discs and pads.

But every supplier is saying they are 356mm.... if they are 380mm on the 4.2 tdi and the S8 visually look larger than the 4.2 tdi then what size are they ....390+mm?

I also need a full technical spec and can't find one..

I'm looking for the offset, thickness, diameter, etc. Etc.

I've found a company in America that will make oem replacement rotors in a two piece full floating. The calipers are great but the rotor let's it down when your braking from 200mph!!!

Anyone able to help me with a spec?

Many thanks
Ian
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Old 21st November 2017, 11:10 PM
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Have you tried TPS?

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Audi S8 2002, Black (even the chrome bits)
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Old 22nd November 2017, 07:24 AM
paulrstaylor paulrstaylor is offline
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380mm or 400mm were the two Iíve seen, not available aftermarket as Audi have a patent on the design, but I did see some recently that were reasonably priced, donít have a link to hand though as travelling at present.
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Old 22nd November 2017, 11:35 AM
A8 Ian A8 Ian is offline
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My discs are OK at the moment I just needed dimensions for the manufacture who will make me some custom two piece floating ones to replace oem
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Old 22nd November 2017, 12:09 PM
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homer simpson homer simpson is offline
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Looking at ETKA based n a 2015 car, the biggest fronts seem to be 400 x 38mm (Brembo). This is the same size as the ceramics
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Old 22nd November 2017, 01:26 PM
paulrstaylor paulrstaylor is offline
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400mm is rare on the 4.2TDI, only seen one fitted with them. Also used on the W12.

380mm more likely, PR code 1LJ.

See here for specs.

https://www.zimmermann-bremsentechni...quattro-35823/
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Old 22nd November 2017, 02:39 PM
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homer simpson homer simpson is offline
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Quote:
Originally Posted by paulrstaylor View Post
400mm is rare on the 4.2TDI, only seen one fitted with them. Also used on the W12.

380mm more likely, PR code 1LJ.

See here for specs.

https://www.zimmermann-bremsentechni...quattro-35823/
Going by the title isn't it for a S8?
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Old 22nd November 2017, 03:09 PM
paulrstaylor paulrstaylor is offline
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Note to self, read the title!

S8 will probably be be 400mm! But the 380mm linked above is listed for S8 also, so need to check the PR code to be sure?
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Old 22nd November 2017, 11:04 PM
A8 Ian A8 Ian is offline
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Right I've measured them following a pad change and what an interesting design! 400mm X 38mm and they are fully floating... they have aluminium rivets that hold the rotor on the hat...
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Old 23rd November 2017, 07:35 AM
paulrstaylor paulrstaylor is offline
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Quote:
Originally Posted by A8 Ian View Post
Right I've measured them following a pad change and what an interesting design! 400mm X 38mm and they are fully floating... they have aluminium rivets that hold the rotor on the hat...
Which is Audiís patent I understand, hence nothing aftermarket off the shelf. Iím interested in why you want to get some made, to try to improve them?
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