kos11-12

Hi guys,
I know we talked about it a dozen of times but I just wanted to be sure before I jump on and buy something that is wrong.I found a pair of calipers there are from a 993 with reference 993 351 42 100 /200 pistons are 44/36 (colour black) ,would they fit on 322x32 discs for a brake upgrade.
many thanks Konstantin

Christer

The 322 disc you are quoting sounds like what I have on the front of my car which has (effectively) RS brakes. If you are talking about the front of your car then you should use IMHO the 964 Turbo caliper with that disc on the front.....its a long time ago now that I upgraded my brakes so you may want to wait fro a guru to come along just in case....

Geoffrey

You have two choices for front brake rotors, the 91/92/964RS front rotor which is 322x32 and accepts the pad for that caliper known as the "S4 caliper". The other is from a 94 3.6 Turbo, also 322x32, but has a smaller hub and accepts the pad from the "big red" caliper.

Bill Verburg

993 351 421 00 & 993 351 422 00 are the stock n/a 993 front calipers usually used w/ 304x32 rotors(as Geoffrey said aka S4 calipers) they can be used w/ 322x32 rotors but it's a waste of rotor. The usual caliper for a 322x32 is the 993 351 425 10 & 993 351 426 10(aka Big Red) there is also a black version that was used on 928GTS.

w/ any of the above calipers you will also want to use n/a 993 rear calipers and a 23.8mm m/c

Geoffrey

The larger diameter a rotor, the more brake torque the brakes will have, so it is an effective way at increasing braking capability, even if the same caliper is utilized.

Bill Verburg

true, but is more front torque really needed?

Geoffrey

At high speeds on the track, it is impossible to lockup the brakes on initial application which shows that the brake system can be improved. This is the main advantage of running say the 380mm endurance brakes on the race cars. On the street, no, there isn't a stock Porsche brake system that needs to be upgraded for performance reasons.

Bill Verburg

Agreed, I guess my point above was that as long as class rules don't prohibit it the Big Red is a better choice for a 322.

Brembo has a really nice 304x32 that w/ the right hat is perfect for the smaller 993 caliper.
this rotor


w/ an approprite hat


and caliper adaptor would have plenty of torque, thermal capacity and be lighter to boot.

kos11-12

hi,
thanks Bill,thanks Geoffrey for your reply ,(sorry I was away for a few days).
So if I understand well the 993 caliper is ok for 322x32 rotor witch is 965 rotor, but the pad is smaler than the big red/ black (993 pad 132x48? big red 132x58?) so that Brembo rotor is the perfect fit, that is interesting,in your opinion what combo would make better brakes big red/ black with 322x32 or standar calipers ( 132x48 pads pistons 40/36) with 355x28 sloted discs with alloy hud from Brembo
Konstantin

Bill Verburg

In order of preference, for a 964 w/17 or 18" wheels
front 322x32 w/ Big Red(or black) 36/40 caliper(132x58 pad) rear 299x24 w/ 993(rear) 30/34 caliper(98x44 pad) 23.8mm or 25.4mm m/c

front 322x32 w/ 993(front) or 964RS or 965 3.3 36/40 caliper(132x48 pad) rear 299x24 w/ 993(rear) 30/34 caliper(98x44 pad) 23.8mm or 25.4mm m/c

all calipers have a limited range of rotor diameters. 322 to 330 is the limit for these calipers. 355 is way too big for the application