CoupeQuattro rear brakes bolt-on upgrade version

[Tom_]

Folks, maybe some smaller upgrade with the stock 4x108 pattern? Front I have 324mm brakes but for the rear, I will gladly upgrade to something like 280mm.

[Tractor Dave]

Have you got a Coupe or Avant?

[Beppo]

B6 S4 numbers:
Right rear caliper - 8E0 615 424 C
Left rear caliper - 8E0 615 423 C
Carrier (not handed) - 8E0 615 425 B

I have the parts above. But what kind of brake pads is it ? is there OEM nr. If i want to order standard pads from what carmodel/ year are they from ?

Have you made an effort to mount these things on the car? I´m in the process of arranging better solution for my rear breaks and I´m keen to know if the S4B6 way is a way to go about it.

[Bowie69]

Brake pad numbers are in the first post.

[S2_avant 19930325]

B6 S4 numbers:
Right rear caliper - 8E0 615 424 C
Left rear caliper - 8E0 615 423 C
Carrier (not handed) - 8E0 615 425 B

I have the parts above. But what kind of brake pads is it ? is there OEM nr. If i want to order standard pads from what carmodel/ year are they from ?

[Oddi78]

Ok, so I must have the 280mm carrier from det S8 D2, and URs4/S6 caliper to this fit the 280mm discs set up?

[_ShurikeN]

D2 alu caliper should fit the carrier, but not sure about E-brake cable: it has different attachment point.

A8 D2 rear brakes should be 269mm IIRC. Should fit similar way as the 280mm setup with Allroad 4B rear 269 disc, but that is not checked properly.

[Oddi78]

A version for Coupe Quattro typ89 bolt-on rear brakes upgrade with 5x112 lug pattern:

Rear hubs from A4 B5 Quattro OE VAG p/n 8D0 501 653 B (+8mm track outwards each side)
Cast iron calipers from UrQuattro/200(44)/V8(D11)/UrS4(4A)/UrS6(4A) for 269mm brakes VAG p/n 447 615 423(4)
Rear caliper carriers from S8(D2) 280mm VAG p/n 4D0 615 425 C
Brake discs A4(B5) front == S8(D2) rear 280mm VAG p/n 8E0 615 301 B(P)
Brake pads, let's say, VAG p/n 1J0 698 451 L

~~2-mm-thick M10 washer is to be placed between hub carrier and caliper carrier.

Caliper carrier bolts must be replaced to smth at last 4mm longer than native ones. The easiest and cheapest way is to use OEM VAG bolts N 101 815 02 (M10x1.25x40) and cut away redundant thread.

Do you know if the A8 4.2 228kw alu caliper fit this set ut?
And do the carrier fits the your set up?

[Oddi78]

or just like i did:

a4 b5 quattro rear hubs
rs4 b5 caliper-brackets (unmodified)
girling 41/43 from urs4/urs6
standard brake line
standard hand brake cable
rs4 b5 brake discs

this is really pnp for 312mm on the S2 coupé and fits perfectly..

What do you use in front, and what master cylinder do you use?

[_ShurikeN]

Hello,
I have this setup: https://www.s2forum.com/forum/techni...e-on-the-front

I would recommend something similar. Calipers with 4 big pistons (40/44mm), 2 halves (non-monoblocks). Radial-mounted calipers would be smarter of course (Audi RS2, Porsche, Alfa-Romeo etc.) I'm planning to change my calipers to ones from RS2 just because I have found original ones with original brackets (for the sake of authenticity) though RS2 calipers have smaller pistons.

Would not recommend Cayenne 17Z/18Z: in my opinion they are too big and heavy for small chassis audis, leave them for big-chassis 44/4A etc.

Tandem vacuum booster with 25-27mm main cylinder (I have one from Allroad 4F).
Extra vacuum reservoir would be nice to have. Planning to install one from Volvo.

[Oddi78]

A version for Coupe Quattro typ89 bolt-on rear brakes upgrade with 5x112 lug pattern:

Rear hubs from A4 B5 Quattro OE VAG p/n 8D0 501 653 B (+8mm track outwards each side)
Cast iron calipers from UrQuattro/200(44)/V8(D11)/UrS4(4A)/UrS6(4A) for 269mm brakes VAG p/n 447 615 423(4)
Rear caliper carriers from S8(D2) 280mm VAG p/n 4D0 615 425 C
Brake discs A4(B5) front == S8(D2) rear 280mm VAG p/n 8E0 615 301 B(P)
Brake pads, let's say, VAG p/n 1J0 698 451 L

~~2-mm-thick M10 washer is to be placed between hub carrier and caliper carrier.

Caliper carrier bolts must be replaced to smth at last 4mm longer than native ones. The easiest and cheapest way is to use OEM VAG bolts N 101 815 02 (M10x1.25x40) and cut away redundant thread.

Hallo!
What set up do you recoment in front with this 280mm brake kit in the rear?

[Jaswan]

I believe that all B5 quattro rear hubs are the same?

Jase.

[Oddi78]

or just like i did:

a4 b5 quattro rear hubs
rs4 b5 caliper-brackets (unmodified)
girling 41/43 from urs4/urs6
standard brake line
standard hand brake cable
rs4 b5 brake discs

this is really pnp for 312mm on the S2 coupé and fits perfectly..

Must the hub be from RS4 og can I use a hub from a 1.8t a4 b5?

[_ShurikeN]

Slightly updated some tech info and uploaded better pictures of an assembly.

[caterpillar]

to hav TOO big brakes on its too silly.. spec in the rear end.. i hav 330mm rotor on my s6 car... and this car are a heavy vagon... 18" rims are the smalles one.. and the tyres cost alot...
big brakes are a good idee, but not too big...!! its heavy also..