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-   -   D4 S8 Disc brake size (https://forum.a8parts.co.uk/showthread.php?t=13628)

A8 Ian 21st November 2017 10:41 PM

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

briang9 22nd November 2017 12:10 AM

Have you tried TPS?

+++

paulrstaylor 22nd November 2017 08:24 AM

380mm or 400mm were the two I’ve seen, not available aftermarket as Audi have a patent on the design, but I did see some recently that were reasonably priced, don’t have a link to hand though as travelling at present.

A8 Ian 22nd November 2017 12:35 PM

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 +++

homer simpson 22nd November 2017 01:09 PM

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

paulrstaylor 22nd November 2017 02:26 PM

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/

homer simpson 22nd November 2017 03:39 PM

Quote:

Originally Posted by paulrstaylor (Post 135133)
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?

paulrstaylor 22nd November 2017 04:09 PM

Note to self, read the title! :ROFL:

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?

A8 Ian 23rd November 2017 12:04 AM

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...

paulrstaylor 23rd November 2017 08:35 AM

Quote:

Originally Posted by A8 Ian (Post 135156)
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 Audi’s patent I understand, hence nothing aftermarket off the shelf. I’m interested in why you want to get some made, to try to improve them?


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