968CS, 993TT or 996 Mono's?

[Henka]

I just found an add about a complete set of calipers, both front and rear, from a RS2. Now, these calipers may be 968CS or 993TT. I was planning on going 996 and A8 disk. If they indeed are 993TT I'll buy them but what if they are 968CS? How do they compare to the 996 monoblocks? A buddy of mine has 993TT, awsome brakes with one drawback. You need 17" and I'd like to be able to run 16" in the winter. With 996's I'd be able to run a bigger disc than I would with 993TT. So how would the 968CS stand up to hard abuse? I guess the 968's would still be a massive improvment over stock brakes. How thick disc where they designed for? Any chance of squezeing in a 32?

(968CS=Porsche 968 Clubsport=stock calipers on RS2)

[S2central.net]

I don't even know the difference between a 996, 993 or 968 for cryin out loud. Sorry to be such a philistine - they are all just some flavour of a 911 to my mind.

I dunno if the RS2 (968CS) calipers can be used with the RS2 carriers and A8 discs, but suspect that custom made carriers would enable any suitable application. I think someone has used the 968CS calipers and RS2 carriers inside 16" Avus with custom discs...

My preference is for a complete bolt-on option using the 996 calipers, RS2 carriers and A8 discs. This gives a massive brake upgrade on stock and fits inside 16" Avus - for a very reasonable price if sourcing calipers 2nd hand.

Paul

[Henka]

First off. A Porsche 968 CS is not a911 but rather a... Porsche 968. 993 and 996 are both 911's. So. The Standrad RS2 brakes came off a Porsche 968 CS (M30 option). Front discs where 304 x 32. RS2 had 993 TT calipers as an option, they used discs that were 322 x 32. 996 Carerra and Boxster S used discs that were 318 x 28.

Anyways, I'm leaning towards the Boxtsre S calipers as they are fairly cheap and bolt rigt on.

[dan_b]

IF you want to use the 968CS Calipers (ie the standard RS2 caliper), you can use the RS2 bracket, and an A8 disc but you'll need to get that disc turned down to 304mm. The A8 disc is 30mm so will be fine in that caliper, but you should take care to specify the correct pads and don't run the pad and disc right down to minimum wear as the caliper was designed for a 32mm disc...

This will fit under a 16" wheel.

This is the setup I have on my fronts - they are a massive improvement and stand up to a good thrashing on the track fine. It's a straight bolt on for the fronts. It's not a straight bolt on for your rears though!

The main issue with these older calipers (ie NOT the later "Monobloc" design) is that they use a stainless steel sprung plate to retain the pads: over time, corrosion builds up between the back of this plate and the caliper, and this can cause pad squeal as the pad can't move properly. If you get these calipers, inspect the condition of the sprung plates carefully and consider replacing them if they need it.