2003 S6 C5 rear brakes upgrade options.

[Iksan12]

Hello guys , i just got an S6 and im trying to figure out some viable options to upgrade the rear brakes. I did the front already with 18z conversion but the rears are so small it just looks so silly. Please guys pitch in with some ideas .
Thanks for the attention.

[NWS6]

Here's one possibility.

https://apikol.com/product/c5-v8-rea...0mm-s6-a6-4-2/

[Iksan12]

Not interested in this one . Rotors are too small . Maybe something else.

[V1nny]

apicol and similar jhm brackets is the only inexpensive option, and also most practical
anything else cost much more, and best purchased together as one solution for front and back, to keep your braking bias optimal

[Dinsdale]

apicol and similar jhm brackets is the only inexpensive option, and also most practical
anything else cost much more, and best purchased together as one solution for front and back, to keep your braking bias optimal

When the man with Four Rings speaks the One Ringed man is wise to listen.

[Dinsdale]

Not interested in this one . Rotors are too small . Maybe something else.

Voshmods.com has an adapter. 330mm rotors with 4 calipers!

[OOOOallroad]

Grab some B8 rear calipers with d3a8 310mm rotors. Setup is cheap and effective. Grab some pads and you’re ready to go. Bolts right on.


Sent from my iPhone using Audizine Forum

[ChicagosPhantom]

Grab some B8 rear calipers with d3a8 310mm rotors. Setup is cheap and effective. Grab some pads and you’re ready to go. Bolts right on.


Sent from my iPhone using Audizine Forum

Wrong that won't work on S6...and you meant B6/7 calipers.

[ChicagosPhantom]

Hello guys , i just got an S6 and im trying to figure out some viable options to upgrade the rear brakes. I did the front already with 18z conversion but the rears are so small it just looks so silly. Please guys pitch in with some ideas .
Thanks for the attention.

There's no upgrade for S6 without excessive work that's bolt on.

S6 and 4.2 V8 A6 use aluminum rear knuckle.

You have two options for proper BBK in the rear.

Either get A6 V6 or allroad rear knuckles and swap B6/7 calipers with D3 A8 rotors. 310mm option

Other option is RS6 rear calipers rotors and you'll need RS6 specific knuckles to do the swap. 335mm option

Also for both of these options you'll need rear tie rods either from allroad or RS6 to swap in.

Forget brackets and such from the mentioned companies. They're just a snake oil and aren't upgrade over stock.

[ChicagosPhantom]

Here's one possibility.

https://apikol.com/product/c5-v8-rea...0mm-s6-a6-4-2/

Looks absolutely horrible. Pad overhang and not utilizing whole rotor surface. Dumb. IDK why was it even released.

[jbain2]

Looks absolutely horrible. Pad overhang and not utilizing whole rotor surface. Dumb. IDK why was it even released.

Because people buy it. For daily driving there is no evidence that any of these upgrades make a difference in stopping distance. It’s all about the aesthetic appeal.

Track or racing purposes may be a different story.


Sent from my iPhone using Audizine

[Iksan12]

Im going to make a very radical approach. Just started making a rough sketch on the bracket tonight. I got a set calipers from a Touareg ( Cayenne GTS (957)) and my original calipers (S6)
Im thinking since i dont want to pay RS tax on rotors that are 500$ bux each . I got a rear rotors from bentley continental , 335x22 for just 68$ from WorldPak.... . Bracket shouldnt be difficult to make. Lets make some history for the S6 owners that are screwed with the aluminium knuckle and all the companies that want to suck our pockets out . I will keep you updated guys. Im sick of it...

[ChicagosPhantom]

Im going to make a very radical approach. Just started making a rough sketch on the bracket tonight. I got a set calipers from a Touareg ( Cayenne GTS (957)) and my original calipers (S6)
Im thinking since i dont want to pay RS tax on rotors that are 500$ bux each . I got a rear rotors from bentley continental , 335x22 for just 68$ from WorldPak.... . Bracket shouldnt be difficult to make. Lets make some history for the S6 owners that are screwed with the aluminium knuckle and all the companies that want to suck our pockets out . I will keep you updated guys. Im sick of it...

This rotor will be an option now for allroad and V6 A6 guys to run with RS6 rear caliper and carrier combo and this won't require RS6 rear knuckle, that retrofit got more affordable and a direct bolt on option. Sweet!

Nice find man.

[Iksan12]

This rotor will be an option now for allroad and V6 A6 guys to run with RS6 rear caliper and carrier combo and this won't require RS6 rear knuckle, that retrofit got more affordable and a direct bolt on option. Sweet!

Nice find man.

You are welcome man. This is what i came up with for my rear setup. Stock S6 caliper is used only for parking brake. Rear brembos are from Cayenne. Rotor is from Bentley Continental 335x22. No more tax for the RS6 guys and us that are getting ripped on the price for new rotors.

[Iksan12]

You are welcome man. This is what i came up with for my rear setup. Stock S6 caliper is used only for parking brake. Rear brembos are from Cayenne. Rotor is from Bentley Continental 335x22. No more tax for the RS6 guys and us that are getting ripped on the price for new rotors.

Brembo Rear.jpg

[V1nny]

This rotor will be an option now for allroad and V6 A6 guys to run with RS6 rear caliper and carrier combo and this won't require RS6 rear knuckle, that retrofit got more affordable and a direct bolt on option. Sweet!

Nice find man.

https://www.ebay.com/itm/155294633461
https://www.ebay.com/itm/175516021635

would these work for this setup with 03 rs6 calipers on 01 Allroad?

[blairdude]

If anyone's interested, I came up with another fairly bolt-on upgrade for the aluminum rear knuckles (I plan on installing them in my Allroad). I got my aluminum knuckles from a W8 Passat, but I believe they are identical to the S6 knuckles. It consists of:

B6/B7 S4 Rear Calipers
3rd-Gen Nissan Altima Front Rotors (02-06, 296mm)
B6/B7 A4 Upper Rear Caliper Bolts x 4

Rotor lug holes need to be enlarged slightly to fit the Audi bolt pattern. Hub opening is already perfect. Rotors are about 2mm wider (when new) than S4 rotors, but there is still room in the S4 calipers with brand new pads. Brake pads fit perfectly with no overhang, and the e-brake cables hook up just like doing the S4 upgrade on any C5 Allroad. The only things I had to do were use one washer on each caliper bracket bolt to center the caliper carrier over the rotor, there was a tiny bit of trimming needed on the dust cover to clear the caliper carrier, and the dust shield needed some bending to clear the rotor all the way around.

S6Brakes1.jpgS6Brakes2.jpgS6Brakes3.jpgS6Brakes4.jpg

[ChicagosPhantom]

If anyone's interested, I came up with another fairly bolt-on upgrade for the aluminum rear knuckles (I plan on installing them in my Allroad). I got my aluminum knuckles from a W8 Passat, but I believe they are identical to the S6 knuckles. It consists of:

B6/B7 S4 Rear Calipers
3rd-Gen Nissan Altima Front Rotors (02-06, 296mm)
B6/B7 A4 Upper Rear Caliper Bolts x 4

Rotor lug holes need to be enlarged slightly to fit the Audi bolt pattern. Hub opening is already perfect. Rotors are about 2mm wider (when new) than S4 rotors, but there is still room in the S4 calipers with brand new pads. Brake pads fit perfectly with no overhang, and the e-brake cables hook up just like doing the S4 upgrade on any C5 Allroad. The only things I had to do were use one washer on each caliper bracket bolt to center the caliper carrier over the rotor, there was a tiny bit of trimming needed on the dust cover to clear the caliper carrier, and the dust shield needed some bending to clear the rotor all the way around.

S6Brakes1.jpgS6Brakes2.jpgS6Brakes3.jpgS6Brakes4.jpg

Why would you do all of this when you can do D3 A8 V8 310mm rotor on stock knuckle with B6/7 S4 caliper carrier?

[ChicagosPhantom]

https://www.ebay.com/itm/155294633461
https://www.ebay.com/itm/175516021635

would these work for this setup with 03 rs6 calipers on 01 Allroad?

Looks like they will.

[blairdude]

Why would you do all of this when you can do D3 A8 V8 310mm rotor on stock knuckle with B6/7 S4 caliper carrier?

I bought the aluminum knuckles with the goal of shedding some unsprung weight. At the time, I didn't realize that the caliper carrier bolt holes were located further inboard on the aluminum knuckles (I already had the B6/7 S4 calipers and D3 Rotors, and the D3 rotors were too large to fit with the S4 carriers). Turned out perfect with the Nissan rotors, however, and braking difference will likely be negligible. Bit of an exaggeration to call it "all this" when the only real difference is using different rotors and drilling out the lug holes slightly.

[ChicagosPhantom]

I bought the aluminum knuckles with the goal of shedding some unsprung weight. At the time, I didn't realize that the caliper carrier bolt holes were located further inboard on the aluminum knuckles (I already had the B6/7 S4 calipers and D3 Rotors, and the D3 rotors were too large to fit with the S4 carriers). Turned out perfect with the Nissan rotors, however, and braking difference will likely be negligible. Bit of an exaggeration to call it "all this" when the only real difference is using different rotors and drilling out the lug holes slightly.

Swapping out a knuckle adds to that "all this"...plus one more thing, you'll have to swap rear tie rod as well. Unsprung weight...how much you'll save, a pound or two. I'm just trying to save you from a headache and unnecessary work. D3 310mm rotor fits perfect under B6/7 caliper/carrier. It's the most simple, cost-effective and proven upgrade.

[blairdude]

Swapping out a knuckle adds to that "all this"...plus one more thing, you'll have to swap rear tie rod as well. Unsprung weight...how much you'll save, a pound or two. I'm just trying to save you from a headache and unnecessary work. D3 310mm rotor fits perfect under B6/7 caliper/carrier. It's the most simple, cost-effective and proven upgrade.

I think you misunderstand the topic of this thread..
It's about brake upgrades for the S6 rear aluminum knuckles, and what I posted was perfectly relevant, while the D3 rotor upgrade is not.

I wasn't suggesting that other Allroad owners should choose to use aluminum knuckles instead of the D3 upgrade. I was just pointing out a setup that works nicely with aluminum knuckles. The aluminum knuckles only cost $40 each (CAD), so it was also pretty cost-effective and it's not difficult to swap them out.

[ChicagosPhantom]

I think you misunderstand the topic of this thread..
It's about brake upgrades for the S6 rear aluminum knuckles, and what I posted was perfectly relevant, while the D3 rotor upgrade is not.

I wasn't suggesting that other Allroad owners should choose to use aluminum knuckles instead of the D3 upgrade. I was just pointing out a setup that works nicely with aluminum knuckles. The aluminum knuckles only cost $40 each (CAD), so it was also pretty cost-effective and it's not difficult to swap them out.

Yeah, could be interpreted as that....however I was just suggesting that it's not worth it in your case when you already have an upgrade that's a bolt on. In other hand, nice work on figuring out that setup, for sure took some time to and it's a nice fitment. Yet again it's a waste on allroad, you're not benefiting on unsprung weight and rotor is smaller than D3 one.

Everybody is upgrading calipers, but what about that tiny master cylinder and brake booster ?

[Iksan12]

I forgot to tell you guys i have 27mm master with booster from RS6.

[blairdude]

Yeah, could be interpreted as that....however I was just suggesting that it's not worth it in your case when you already have an upgrade that's a bolt on. In other hand, nice work on figuring out that setup, for sure took some time to and it's a nice fitment. Yet again it's a waste on allroad, you're not benefiting on unsprung weight and rotor is smaller than D3 one.

Everybody is upgrading calipers, but what about that tiny master cylinder and brake booster ?

Didn't take much time at all! Looking at the 17z upgrade info for the front, I could tell that Nissan uses the same rotor center bore, and from there, I went on rockauto and looked at various Nissan rotors to find one that would fit (based on dimensions of other factory rotors, like the D3 A8, B6/7 S4, stock W8, stock Allroad, etc). From there, I went to the junkyard and picked up $7 rotors to test fit; might even use them since they look almost new.

As for master cylinder, I actually think the whole setup will be balanced with the stock master cylinder. Reason being, I'm using Q5 2.0T Brembos up front with the stock rotor size, and looking at the factory Q5 specs, they have a 320mm front rotor (like the Allroad), 300mm rear rotor (a mere 4mm larger than what I will have), and their rear calipers have a 43mm bore size just like the B6/7 S4 rear caliper, with a 25mm master cylinder which is the same bore as the Allroad has. One reason I'm going with the Q5 Brembos is that I want to still be able to run a 16" wheel.

[Caddylack]

One reason I'm going with the Q5 Brembos is that I want to still be able to run a 16" wheel.

Did you buy your calipers yet? I have a full set of the 4-piston Brembos from a Touareg (front and rear).

$175 per pair, including shipping and PayPal fees
$300 for all 4 calipers, including shipping and PayPal fees

They come with lightly used pads.

[blairdude]

Did you buy your calipers yet? I have a full set of the 4-piston Brembos from a Touareg (front and rear).

$175 per pair, including shipping and PayPal fees
$300 for all 4 calipers, including shipping and PayPal fees

They come with lightly used pads.

Yes I have my calipers. Also, the Touareg calipers are different, and I don't think they fit behind 16s.

[Booested4door]

Brembo Rear.jpg

Are you selling the brackets for this setup? i would like to do this to my car....

[bwjpc92]

Agreed, I'd like to do this to my car. Would you sell the brackets or send the drawings you made yours from so I could make my own?