A8 D3 rear Disc (several sizes) is the same Caliper used
 

looking into larger rear discs im finding several sizes are available.
looks like 335mm are the biggest !
so i need to know the following please

can i use the same caliper ?
i know i have to buy the apropriate caliper carriers too
cheers all

Yes, the caliper is the same from 280-335mm. Just the carrier changes.

Will not recommend to increase the size in the rear if you are not doing the same in the front, or else you will upset the brake bias.

Already got S8 fronts on +++:)

Oh ok, then I highly recommend to mount the same in the rear, because now you've already upset the brake bias. I did the S8/W12 brakes on mine a few years ago and did the fronts first and the rear the day after. In between I had a test drive and the balance of the brakes was horrible! The car nose dived heavily under braking and if I used brakes in corners, it under-steered a lot. After finishing both the front and the rear, the brake balance is perfect.

Tip, also change to S8 anti sway bars. :)

Sounds good, cheers, +++

part numbers
 

can anyone confirm these part numbers for a pair of 335mm rear caliper carriers for the D3

3D0 615 426 D
3DO 615 425 D

left & right

thanks

The numbers you have is for the dust shield, that you need to replace too. The old ones won't fit with the bigger disc.

For the carriers:
Left: 4E0615375D (Wrong number)
Right: 4E0615376D (Wrong number)
New ones below.

brain freeze here !

3D0615426D + 3D0615425D i think is correct also confirmed by TPS and A8 parts

also anybody had experience with the following?

https://www.ebay.co.uk/itm/222662699872

Ops, my number over is wrong!

New numbers for the carriers:
Left: 4E0615425A
Right: 4E0615426A

Look at attached pic.

https://neshaug.files.wordpress.com/...7/000234-1.jpg