Cross drilled brake discs

[GlynRS2]

I was thinking of upgrading to the big red callipers with the cross drilled 322x32 mm discs up front and the cross drilled rear discs, as these were an original factory fit option (part no. 8A0 698 203 for the conversion kit). However, this kit is about £1500 + vat
The people who have this already say it is a very significant upgrade, and of course you can always sell the original brake kit to offset the price etc.. BUT it is stil a big investment!

Today I was browsing this website and came across this:

Cross Drilled Brake Discs, convert to a RS look, fits in place of standard disc, no modifications required;
968 Front £72.00each
968 Rear £65.00each

What do you think??

Shall I save my pennies & go the whole hog, or just do a minor upgrade on the already good brake setup???

[Bluekermit930]

I believe I am correct when I say that the 968 discs you are looking at are the standard size, just drilled ? I have done this upgrade on my car recently and found the results a good improvement over the originals. You should note that the parts are usualy much cheaper from Porsche, cheaper still if you use a Porsche specialist. The standard front discs, drilled & vented are a the same as used on the Porsche 928 S4, the standard RS2 front callipers are from the Porsche 993 Carrera, so these are the pads you need.

The standard factory option was to use the discs & callipers from the Porsche 993 Turbo, with this information you can shop arround, I have found a set of used callipers for £600 at a porsche breakers, but they are not common, also there is a risk they could be shot and you should allow an additional £100 to refurbish them. Discs are better new....

I have no experience of the rears, but I have read that the size of the RS2 discs and callipers were unchanged even on the uprated factory option, just drilled. I have also read that the rear discs are unique to the RS2 so the Porsche option may not be possible. 968 rears might not fit ?

I am considering the big brake upgrade when my discs need doing, when I do I will be going the Porsche route, Audi prices are rediculous. I paid just over £100 for a pair of drilled & vented front discs (928 S4), audi wanted £174 + Vat for one !!!..

Hope this helps

Kermit

[GlynRS2]

Kermit,

Yes these are the standard 304x32mm discs. I was thinking of fitting these as an interim measure until I get the 993 Turbo "Big Reds". Like you say the rears remain the same, but are just drilled on the factory upgrade. I too have heard that the rear discs are unique to the RS2 - which is a shame as it will make them more expensive.

Cheers

[DAVIDP20V]

Glyn, when i needed new front discs i went to euro car parts and got normal size discs but drilled, i think they were called zimmerman or something.
i still dont need to replace rears but i will soon, i remember they didnt do drilled rears. for rs2 fitment.

oh by the way the braking was much improved with drilled discs up front and pagid pads all round.

[GlynRS2]

Kermit,

I paid just over £100 for a pair of drilled & vented front discs (928 S4), audi wanted £174 + Vat for one !!!..

So I guess the front discs you have fitted are Porsche part no. 928.351.043 (Left) /044.04 (Right), 304x32mm, 77mm offset. Where did you get them for just over £100

Looking at the rears again, the only thing that could make them unique surely would be the offset. I think the calliper is the standard Porsche 968 front calliper used on the rear for the RS2. Most likely to be Porsche 928 S4/GT/GTS rear discs I would imagine - would need a friendly parts specialist to help check.

Does anyone know of a good place to buy the Big Red kit at a reasonable price

[falcon1]

Hi All,
You might want to try a 993tt upgrade all around that will give you drilled 322x32 front and drilled 322x28 rear. Just like the 993 RSR that has run that setup and it has lasted the for 24 hours at Daytona and Le Mans. The rear calipers use the same front pads as the RS2 with the smaller piston size so it shouldn't throw the balance off that much if at all.

Just a thought
Good Luck

[Jani]

A couple of things to note: 993tt disc will not fit the RS2 front bolt-on. You need 322x32 mm discs with the 77 mm offset. I believe only 928 GTS was equipped with those front discs, and whether they were perforated or not, I don't know. BTW Porsche discs are perforated while casting, not drilled

If you can find used RS2 big fronts, the hub from those could be used with new discs from 993tt, making it cheaper.

Also there is a smaller issue with 993tt calipers, as I think they were fitted to the leading edge, not trailing like in RS2. So you need to switch sides and change the location of the bleeder nuts in the caliper.

The rears don't need bigger discs IMO, the weight is 60% on the front axle even before braking. The drilled ones work OK in the rear. Again the discs can be sourced from Porsche, the offset is from 928.

[Fen]

Bear in mind I'm a newbie, but my understanding (from talking to my Porsche specialist who used to look after an RS2 at the Exeter Porsche dealer) the rear discs have a 951 part number making them a 944 Turbo part. Could well be used on the 968 as well however, but no 944T had drilled discs so that may explain the Euro Car Pats lack of a listing. They are machined to change the offset.

I think I am right in saying that the front and rear (standard) 968 calipers are the same.

In Porsche circles we avoid drilled discs. Genuine Porsche "drilled" are actually maufactured with the holes already in whereas Zimmermann etc. are truly drilled after manufacture and they are therefore very prone to cracking between the holes. All 944 Turbo and 968 racers use solid (but vented) discs and there has been yet another discussion about trackday brakes on the Porsche Club GB 944 forum last week. Solid discs from either Pagid (OEM) or Zimmermann with Hawk Blue, Porterfield, Pagid or Mintex M1144 pads seemed to come out top. Fluid is also important.

Finally, don't buy used Big Reds for £600! My Official Porsche Centre parts manager offered me "Big Blacks" which are the same but in black (from the 928 GTS) for £300 each; 20+% discount from the list price of £370. OK that's plus VAT but it's for brand new calipers.

[Cobstar]

An interesting thread bearing in mind that the discs on mine must be getting towards the end of their useful life

My beast has cross drilled discs - same size as standard discs fitted initially. They were fitted by a Porsche Audi specialist the previous owner used. Unfortunately the invoice doesn't give the part number. Pads were a Porsche item so could have been sourced from Porsche.

The Audi Upgrade kit is probably cheapest from Vagparts.

[alastairg]

The Audi Upgrade kit is probably cheapest from Vagparts

AMD said they could get the kits direct from germany and could undercut Audi. Worth checking out. I am sorry I did not check details of prices

[robo]

Vagparts are very good with big red calipers for 322mm prices £ 499 + vat not bad , I maneged to buy them on ebay for £ 500, as to do with disc 928 gts are 322mm and they do fit rs2 but they dont come drilled, 993 turbo discs are also 322 mm they are drilled but the hat is not deep nuf.

[falcon1]

Hi All,

Here in the states we have several companies that make adapter bells to mount the 322 x 32 993tt rotors to the 944/968's. That may be an option for you also??? They should have the proper offset??

Also the prices you list for the calipers is that for a pair or singles??

[Langbein]

The 322 disc option, is that a set with new calippers? Is there anywhere you can get them on the net (live in Norway) What is the part number?

Another question: is there anyone who has the car in exploded view with part numbers? on a cd perhapes? can I buy it from somewhere? I'm doing a lot of work on my RS2 and it would make everything easier.

Sorry for all the questions, but I have nowhere else to ask

[robo]

Hello.
322mm discs ( not drilled) are from 928 gts and big reds from 993 turbo, buy them from your porsche dealer or ebay and save load of money. Cd for parts is called ETKA and you can get it on ebay, good luck.
thx
rob