Coupe quattro uprated brake recommendations
 

Had good fun Saturday although only doing the parade laps caused me concern as after following not far behind the red R8 and able to do plenty of heavy braking before corners I realised despite Black diamond grooved 280mm discs and pads up front and 256mm at the rear, (both with standard calipers) I was starting to get brake fade. I am therefore looking for anyone who may of further uprated the braking on these series 2's bearing in mind I am sticking with the 15" Ronals for originality.
Have found this site but had no experience of them. All feedback appreciated.:tup:

http://www.bigbrakes4u.co.uk/k-sport...prod_2055.html

Hey,

I've just put Brembo OE discs (euro car parts stock them) and EBC yellow Stuff pads on our 2.0 B4 Coupe, it has G54 single pot calipers with 280mm disc, and I am yet to fade these. You may point out an engine difference here but trust me if I'm not fading these brakes you'll struggle. There are a few here that may vouch for this :devil:

I once ran Black Diamond 280mm (standard size) grooved with red stuff on the Ur giving it a bit of effort on Knockhill, after previously getting fade with standard discs and pads on G54 calipers.
It took quite a while to start suffering fade with the BD discs.

With G60 calipers, and standard discs but Green pads, the overall feel was much better. 276mm x25mm disc. No noticeable fade after several decent runs.

Now on Brembos (Boxter), with 288mm x 25mm A100 discs, it's pretty good, but hasn't been tried hard. Currently using standard Pagid discs and pads after having a bad set of Black Diamonds!

Apikol do/did a brake calliper bracket in machined cast iron, but my calipers are mounted on Ally brackets from Bambridge.

I think, but I'm not certain, that there are discs of the right size for 4 stud hubs.
On the rear, if you can find a suitable disc, the 'vented' calliper & bracket of the V8/S6/20vUR may fit, but would it give you much extra without a bias pedal box?

Probably the easiest way to improve braking is to simply move the calipers outwards via the use of a suitably made bracket, TSR used to supply a kit to do this on the golfs which allowed 285mm BD discs up front on a 15mm wheel, :tup:

First upgrade would be a set of track orientated pads (Black Diamond performance pads are a "fast road" pad iirc), DS3000, Carbone Lorraine RC6, Carbotech XP10 (or 12 due to weight), Pagid RS29, EBC yellow. The next thing is normally boiling the fluid so you may then need more heat capacity or cooling.

Do the K sports have dust seals? You want dust seals on a road car.

I would be tempted to get a set of Porsche Brembo calipers like the UR guys do as they are designed for road use if you want to change the calipers. Track calipers if its just for track use.

RS2 has brake cooling scoops on the wishbone, you could also fit ducted backing plates.

Most road car setups will not last long under hard track use, tyres will overheat quickly as well if you can stay out longer, its an expensive slippery slope!

I've always used ferodo ds2500 pads, ds3k might be better for track use! But also has anyone mentioned brake fluid?

I've used Motul RBF600 for years, brilliant stuff. As well as that, some diy brake ducting will make a noticable difference!

Thanks everyone,
Presently use the Black Diamond Fast road predator pads all round with the matching 6 groove discs (280 front, 256 rear). Also have a Saab Electric Vac pump to supplement the original Vac unit. Also use fully snythetic DOT 5.1fluid and goodridge braided hoses.

Have been trying to locate a multi pot caliper that will fit behind the Ronal 15" wheel, but so far no luck...:rolleyes:
All help appreciated

AP Monte Carlo 4 x 41.5mm pistons at each corner, 4 x 280mm EBC drilled / grooved disks, and Ferrodo DS-UNO pads will do the trick..... And fit under the 15" wheel, with spacers

Any pics and more info on costs, purchasing etc for these:tup:

A fella from Belfast/NI worked on the setup that I now have on my UR. He specifically wanted as much off the shelf stuff as possible for service, to fit inside the standard 15" Ronal without mods. His starting point being a readily available calliper- brembo from a boxter, and a standard disc. He mocked up his own bracket in plastic, before having it made in Aluminium.

The A100 (5-bolt) disc is 288x25mm, compared with 280x22mm for early Quattro's using G54 single pots, and 276x25 for later G60 twin pots.
I think there is a slightly wide disc that works, but I can't vouch for that.

Maybe you could get the same result starting with finding a suitable 4-bolt disc, and the same calipers?

Before I went to a brembo setup, I uprated from the original single pot calliper to the twin pot, which was a marked improvement.

Andy's spot on again. Here's a pic of what you want and what it looks like. :tup: Where's my cheap oil? :lol:

http://i87.photobucket.com/albums/k1...pstjsw5lmu.jpg

Great pic, Is there a particular model and year of manufacture of Boxster that I need to look out for. Cheers:tup:
PS. Getting another batch of Fuchs titan pro-S race oil in 10w-50 around Christmas hopefully :)

986-351-421 & 422
I think mine came from a 2004 2.7boxter. Or something of that ilk.

For what it's worth-

The 5stud Quattro disc for G60 calipers (late WR, MB, RR) 276x25, PFD 112, has a height of 46mm
The 4stud B4 era 1991 disc listed for the coupe, cabriolet, etc V6, 276x25 pcd 108, has a height of 56mm

What hat height does the disc that you have, use?

I've dug the above info from Euro car parts (based on model info).

986 rings a bell,no idea of what year though. I'll pm you the contact details you will need to get the info you need.

Thats a shame i use the 5w-40 grade,unless of course you can accommodate that? :tup:

When I got my ur, it had Brembo brakes on the front.

The discs came from the sport quattro - 295x28mm

From memory 968/944 fronts with a sport quattro disc, 996 fronts (same as boxster s) with a sport quattro disc, you will need appropriate brackets for either.

Vented rear setup, or go the whole hog and fit monoblocs with an aux handbrake caliper, but that is expensive.

AP kit, they are on bells so I assume they could do 4 stud if they have blank bells.

http://www.ebay.co.uk/itm/Audi-UR-Qu...UAAOSwKOJYHLT0

Other option is looking at standard more modern brakes, A4 brakes fit under 15s I believe, TT 312s are another option, but I am not sure on minimum wheels size.

Are you still 4 stud?

To the best of my knowledge, a major limitation in this is the 4-stud hub.
So;
disc to suit
25mm max thickness, for 986 calliper,
28mm thick needs 996 series calliper, think

A4 b5 fronts off the 2.8 or 1.8t can also be used with the boxster brembo calipers on the front as height at 46.2 is within a whisker of original (46 mm) and thickness is same at 25mm unfortunatly they are only 288mm diameter but much more common than the sport discs.

If you go to 16in wheels then the A6 (97-04 model) 312 mm disc (height 46.6 thickness 25mm) can be used, I used these on my A4 b5 with brembos and an off the shelf adapter.

Appropriate adapter necessary obviously.

I'm assuming 5 stud hubs but hey you can drill 4 stud pattern into a 5 stud disc (one hole is elongated inwards slightly + 3 new ones).

According to Euro car parts they are 39.2 high. Not sure what height I could get to fit:rock:

Yep still 4 stud.:rock:

Just realised you're talking B2 coupe quattro and I was replying for Ur quattro, best place to go to for comparing audi disc sizes is 'brakes international' (http://www.brakesint.co.uk) Rochdale, their online shop gives all the sizes for audis, bit better than ECP or CP4L (same company) , by the way B3 discs for the saloons are 4 mm less than coupe ones (52 v 56) in the 276 size.

Hat size on B2 quattro is 41.7 thickness = 20mm, hat height on B3 saloon 20v is 52 thickness = 25 so disc inner face would be 10mm further in. A4 discs are hat height 46.2 thickness = 25 so again inner face 4.5mm further in and you have to redrill 3 holes and elongate one other as they are 5 stud.
Have you researched ford,volvo or mazda that use PCD 4 x 108 ?, however you will have to machine as centre bore hole diameter is wrong.

Thanks everyone, lots to investigate over winter whlst the cq tucked up in its garage. let you know how i get on..:tup:

Are you 4 or 5 stud?

might be interested in your setup.. how do/did you get 280 mm front and 256 rear?

standard cq are 256mm front aren't they?

I did articles on the setup in VW/Audi driver way back in 1998. Send an email address and I'll forward all the info .
Its much better than oe but compared to modern brakes they lag behind a lot , hence some uprated calipers to up the performance should be all I need. After all it only weighs around 1300kg:smilewinkgrin: