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

Ok, now I see the confusion. The 3D0615426D + 3D0615425D is for the W12 and 4E0615425A + 4E0615426A is for the S8. The last ones maybe painted black? Anyway both will fit with the 335mm disc.

PS, and you need new dust shields to clear the bigger discs.

cheers !

i need caliper carriers but there £300 ish for a pair new :mad:

I bought them used, found a receipt say 30£ for one carrier in email history.

Autodoc have them in stock according to their website. The W12 ones as mentioned by NightOwl above are £44.12 each and are TRW branded. The S8 ones are £89.39 each and are also TRW branded.

You could go 356mm but then we are talking ceramics :D

i dont get the price difference as im pretty sure they are the same item
why would the S8 ones be any different as its the same 335mm disc
???

Silver vs black paint

ordered 335mm rear discs and pads in Brembo
and caliper carriers, cant wait,
my old 280mm rear discs and pads are in very good condition
genuine Audi discs and Pagid pads for sale if your feeling a bit skint

Be sure to double check your order if using Autodoc ........they have a habit of substituting brands....... In particular their own brands without informing you. They did this on me on a couple of orders, I checked my order straight away after placing and they had immediately changed the brands, they are pushing their own brands. I flipped my lid with them. They know after people have waited a week for items to arrive that they won't return the substituted parts....... Be warned.

hi ivanhoe

yes ive ordered from them so see what happens i paid paypal so i might be covered if any issues..
thanks
for the headsup..

Did you set up an account?
They literally changed my order immediately after I placed it, I went back to their site immediately after making payment and they had already substituted the brands, I checked my recent orders.
They did this on two separate occasions. I had to go on web chat to sort it..... They give you spiel about their brand having 3year warranty blah blah blah.
I hope they have now realised that it's bad business practise .

Yes i set up an account
 

my order is showing as picked and on its way to GLS destination parcel centre and still shows all correct items i ordered so far
fingers xxxxxxxx,d

Should be all good then.
Maybe they have seen the error of their ways now.

I know my experience wasn't an isolated incident because I googled it and it had been happening a lot.

its like waiting for xmas
 

The parcel is en route to the destination parcel center.

recieved

Pads are wrong= they are for a Toyota Auris

:mad::mad::mad:

Pads are the same for all rear disc sizes, so if you're old ones are not too bad, you can use them.

bought the proper ones from eurocarparts
 

Brembo ones

Just a note - you can consider EBC Red Stuff or Yellow Stuff brake pads these work great on my S8 without Squeal or noticeable fade and last very long with my steel disks. Cheers,