Do you need upgraded brakes for a Stage2 ?

[douglas96]

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Hi Pete,

At some point I'm going to be getting my brake calipers repainted (as they've got a couple of paint chips on them here and there) and was wondering where you got the "RS" decal from as I don't want to lose that?

Also does anyone know the name of the colour or paint code of the standard black colour on the calipers? Am I right to assume that they are "Brilliant Black" just the same as the grille and the air intakes on the bumper?

Thanks

[IanH755]

Hi Ian,
I remember reading ages ago somewhere on the forum that External Torx sockets were required to be able to change the discs and pads. I assume now that I was reading the process for fitting the AP discs to the car. Do you remember if any of the bolts on the brake calipers and retaining pins, etc. had External Torx heads? I'm just asking as my car will be needing the brakes changed in the spring and I don't have any E-Torx sockets as they're not something I've come across on any VAG cars so far. I tried searching the forum but couldn't find any info on that.

Thanks

I'll be honest, it's been over 18 months since I swapped the 390mm AP discs and OEM Calipers for the 410mm AP Disc/Caliper setup so I'm not 100% sure any more but I don't remember having to to a use Torx drive on the caliper, just a Torx socket for building the AP Discs (attaching the Bell to the Rotor), but I'm going off my very doddery old memory

[douglas96]

I'll be honest, it's been over 18 months since I swapped the 390mm AP discs and OEM Calipers for the 410mm AP Disc/Caliper setup so I'm not 100% sure any more but I don't remember having to to a use Torx drive on the caliper, just a Torx socket for building the AP Discs (attaching the Bell to the Rotor), but I'm going off my very doddery old memory

Haha, no problem Ian thanks for that! I've just looked at the descriptions of the part numbers and the bolts (at least for the fronts) are listed as having hexagon heads so no mention of anything having any External Torx heads as far as I can see.

Thanks again

[Jim Haseltine]

Yep, the front caliper bolts have hex sockets.

[douglas96]

Yep, the front caliper bolts have hex sockets.

Thanks Jim

[pete2144]

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Hi Pete,

At some point I'm going to be getting my brake calipers repainted (as they've got a couple of paint chips on them here and there) and was wondering where you got the "RS" decal from as I don't want to lose that?

Also does anyone know the name of the colour or paint code of the standard black colour on the calipers? Am I right to assume that they are "Brilliant Black" just the same as the grille and the air intakes on the bumper?

Thanks

I got the Calipers painters at KDS in Gillingham Kent, they supplied them so not sure sorry....


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[douglas96]

I got the Calipers painters at KDS in Gillingham Kent, they supplied them so not sure sorry....


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No problem Pete, thanks for getting back to me.

[Badassgermanlook]

Does anyone know if its worth modding the rear brakes to incorporate 4 pot callipers. The c6 rs6 is a heavy beast and cant believe they never had them from the beginning.

[IanH755]

I'd look at 2 things -

1. Whether the master cylinder can supply enough fluid/pressure to an extra 6 pistons over the 2x OEM 1 Pots (8x small vs 2x large)?

2. How much effect it would have on the brake bias?

Master Cylinder - I looked at the GTR setup up as they are 4 pot Brembo rears with an electronic handbrake (rather than having to have a extra caliper just for the handbrake) with a disc size similar to RS6's but I wasn't convinced our master cylinder would be upto the task.

Bias - The car is heavily front biased and I don't know if giving extra "power" to rear brakes would just result in an increased chance of locking them up under heavy braking as a lot of the weight is transferred forward?

While both of those points seem "negative" those are just gut calls with no proper research done by myself into how accurate they are, so there is a good chance that I'm wrong, but it'll definitely need some research doing.

[Golfather]

Does anyone know if its worth modding the rear brakes to incorporate 4 pot callipers. The c6 rs6 is a heavy beast and cant believe they never had them from the beginning.

Wouldnt touch the rears. Even on a ceramic 420mm setup from factory, OEM discs are the same size at the back as steels and use the same calipers.

[RMC83]

I went with the 390mm AP's, DS2500's and ATE Superblue Fluid (OEM rear setup) when I was at Stage 2 and had no issues, even on the track.

Thanks Ian, I presume the 390mm can use the stock calliper without the spacer mod that the 410 requires?

Hello,

Would anyone have a photo of what the spacers actually look like that are required to fit the AP Racing 410mm discs? I have the discs & the longer bolts now, but I dont seem to have the spacers. Are they supposed to look like a bracket, or just like big / thicker washers?

Attached is what was sent, to me but i was expecting 'bracket' type looking spacers, not big washers. Can anyone confirn that these big washer looking items are indeed correct & they are what everyone's calling the spacers?

Cheers
Roy

[welwynnick]

Most brake calipers have mounting bolts that are oriented sideways with respect to the car centreline, and they're the ones that need brackets.

Some high performance calipers like these however, have the mounting bolts oriented longitudinally. The modification consists of moving the caliper backwards by a few mm, and in this case all you need are spacers and longer mounting bolts.

I did this on one of my cars a few years ago (brilliant mod). The trick is getting the height of the spacer right - it's not simply half the difference in the disk diameters. The bolts have to be good as well - typically 12.8 grade steel. IF you're buying a kit, the seller will have figured this out.

Nick

[RMC83]

Most brake calipers have mounting bolts that are oriented sideways with respect to the car centreline, and they're the ones that need brackets.

Some high performance calipers like these however, have the mounting bolts oriented longitudinally. The modification consists of moving the caliper backwards by a few mm, and in this case all you need are spacers and longer mounting bolts.

I did this on one of my cars a few years ago (brilliant mod). The trick is getting the height of the spacer right - it's not simply half the difference in the disk diameters. The bolts have to be good as well - typically 12.8 grade steel. IF you're buying a kit, the seller will have figured this out.

Nick

Hi Nick,

Thanks for that, sounds like i do have the correct items then. I got the discs from RB Racing, but the longer bolts & spacers were shipped seperately by them which have just arrived, so just wanted to check they are indeed the right items. The guys at RB Racing for sure will know their onions, so im confident all is in order.

I've sent my car in to get the TTE 1000+ turbos & Wagner IC installed & i'll also get the brakes done at the same time. It will be a few weeks before i get the car back, but i can't wait to see the outcome!!

Cheers
Roy

[Ceveman73]

I am interested in the brake disc upgrade, however I have 2 questions:

1. As the Ceramic Brembo option on the C6 RS6 uses 420mm discs under stock wheels, why not go for the biggest disc you can achieve on the front and get a 420mm steel disc? Does anyone know if the stock Brembo GT calliper on our cars will accommodate a disc of that size?

2. I understand larger rear disc upgrades are next to impossible due to the servo activated electric parking brake, however I wondered if you could at least fit a compatible 4-pot caliper on there (with similar total piston area) that is compatible with electronic parking brakes? Has anyone tried or have any info?

I think the rear caliper uses a single floating 43mm piston per caliper, with a piston area of 1451mm squared (per caliper). Front caliper uses 34/36/36mm pistons, with piston area of 2942mm squared (per caliper) - giving the brakes a 68% front bias.

Obviously, increasing the disc size at the front will actually increase the front bias even more as a larger disc increases brake torque, which isn't ideal for balance. I would actually make sense to increase the disc size on the rear and/or fit a more aggressive pad on the rear (with higher COF) to improve the brake balance. It is VERY noticeable when braking hard that the rear goes light and all the weight is being shifted even more forward, so be useful to offset that a little.

Anyone have experience in this area?

Cheers,

Mart.

[welwynnick]

Roy, that sounds like it's going to be a brilliant car. Can't wait to hear how you get on.

Mart, after market manufacturers sell 405 and 410mm front discs for the RS6, but I've never seen anyone offer 420m steel discs. It could be that the caliper won't "stretch" that far. Calipers are compatible with a modest range of disc diameters, but there are limits, and if you go too far the pads won't sit on the discs properly. 410mm is probably as far as you can go with the stock calipers. Once you have to upgrade the calipers, the upgrade is less cost effective.

The 420mm ceramic brakes have different calipers, and I think using them with steel discs would be difficult and expensive if not impossible (pad availability etc).

If you have larger wheels, there's a few companies that offer 430mm steel brake upgrades:

https://ceika-store.com/products/cbk77? ... udi~md_rs6
https://www.pbbrakes.com/audi-rs6-c6-08 ... e-kit.html

You're right about piston area and brake bias etc, though you don't take into account the increased leverage of the larger front discs, and it could be that 68% front bias isn't enough.

Nick