tonytaylor

I had my rears with this set up to the metal and they didn`t fallout ( I was using Porterfield pads which lasted 2 days )

Jeff Curtis

Funny, that's what pad I was using, the Porterfield R4S...they lasted two days at the track and I noticed something odd the 2nd session of the 3rd day.

I pulled into realize my right front pads were basically welded to the caliper!!

I'll never do that again.

Here's where the simple math kicked in as I quickly realized the BIG Reds were going to pay for themselves because using the same Porterfield pad up front, with the BIG Reds - they lasted 4-5 days!

I have since changed to Carbotech 1108 compound and am getting a good 3-4 weekends on them and MUCH better stopping power.

tonytaylor

I felt the pads ( Porterfields) had gone a bit off before I found out they were down to the metal. I`m not sure that the fact that I couldn`t really tell the difference between Porterfields with pad material and Portrefields at the metal says more about me or the pads.

Not sure about the maths Jeff, my Porterfields only lasted two days with big reds.

Jeff Curtis

Were you using the R4S (or is it RS4??) track race compound?? If so, your wheels were BLACK by the end of the first day...another thing I detested about the Porterfields.

If you were using the RS4 compound with BIG Reds, and they only lasted two track days...man, you're an ANIMAL!

Matt Romanowski

The R4S is the street/track pad. Did anyone try the full R4 pad?

Matt

ThomasC2

OK I think I'll drop the issue/fears about pads falling out until I hear something else or a "true story". To sum up I'm really please with my Turbo 993/3.6 set up so far.

I use blue Pagids, but they don't seem to be very common pads in the US, why? Here in Sweden I think it's the most common choice if you don't go stock.

ian c - u.k

"I am contemplating the purchase of a pair of BIG Red calipers off of a 1994 C2 Turbo, a 965."

big reds off a 965 ???????????????

i got 965 turbo /rs brakes all round .
i have part numbers at home if you want them .

i also had to fit 9m caliper brackets on the front , as the turbo calipers have there mounting holes through 90 * to a c2"I am contemplating the purchase of a pair of BIG Red calipers off of a 1994 C2 Turbo, a 965."

David K.

Jeff,

Try Pagid Black RS14.

Bill Verburg

Some clarification may be in order here.

There are 3 sizes of multi piece Brembo caliper used on Porsches

only the 2 smaller sizes were ever used on the rear. Neither was The Big Red

Here is a pic comparing the 2 rear size calipers w/ a 911 M rear caliper



The upper is the middle size(993/S4) w/ axial mounts as used on the rear of a 993tt, it has 28/28 pistons and works w/ a 304-330x28mm rotor

The lower is the smallest size all of which are axial mount oem and in the case of a 965 rear has 30/34 pistions and works w/ a 304-318x28mm rotor.
There are other versions of this caliper w/ smaller and w/ larger pistons designed for 24 & 28mm rotors. The big differences are the pad box width which determines the necessary rotor width and piston sizes.

w/o sacrificing the parking brake there are only 2 easy ways to go for a 964 w/ true Big Red fronts on 322x32mm rotors.
1) buy a Racetech/Brembo rear kit which uses the upper caliper and a Brembo 312x28mm rear rotor.

2)use 993 rear calipers(30/34) on the stock 964 rear rotors.

You could buy and modify 965 rear calipers but in doing so you just change them into 993 rears so why bother

When the 965 calipers(28mm design rotor) are used on 24mm rotors the pistons can become hyperextended when the pads are worn. This reduces the support necessary to keep them running true to their bores and can lead to stuck and ruined calipers.

As for pads I am hearing great things about the carbon/metallics and am anxious to try them this coming year.

I never use the dampers PIA and not an asset

Jeff Curtis

OK, so what you're saying is that I need to buy a pair of 993 REAR brake calipers and bolt them on??

If both calipers (965 and 993) were designed for 28mm rotors, WHY does it seem you mention that the trouble with 24mm rotors would only be incurred with the 965 calipers??

Aren't the 965 rear calipers a bolt-on option as well?? What does one need to "modify" to use them?? ...or are you just referring to the need to space them out so they're centered??

Okay...maybe I've figured this out...you mean that one would NOT have to shim the 993 calipers out as they will be centered without shims? If so, I agree, the 993 calipers are the way to go!

...but the 28mm/28mm pistons got me wondering if this is a viable upgrade??

As for pad size, what pads are used in the 993 calipers...it appears a larger pad than what's used on the 964 calipers??

Lemme get this straight, with 965 calipers you would need to shim them in order to get them centered and although they take a smaller sized pad when compared to the 993 rear calipers, they do offer 34mm/30mm diameter pistons...with the 993 calipers, you would NOT have to shim them for centering, they take a larger pad although they have two tiny little 28mm each side of the caliper??

Do I have that all straight or do I need to "study" more?

viperbob

Just to add a little more info, there are a number of 993TTs with 30/28mm piston calipers, and the rears on the RS 3.8 are MUCH larger. I just added them to compliment my red F50 Brembo calipers on the front w/Porsche script caliper and 14" rotors

Bill Verburg

Jeff,
965 rears are designed for 28x299 & have 30/34
993 rears are designed for 24x299 & have 30/34
964 rears are designed for 24x299 & have 28/30

a narrowed 965 rear becomes a 993 rear

stock 964 rear rotor is 24x299, it is very involved to fit a larger rotor(exception is the Racetech rear kit)

an alternative holey rear that fits the same as stock 24x299 is the 968 rear 24x299 part# 951 352 041 91

Viperbob is correct there are 3 versions of the 993tt rear(which is the middle size caliper, usually called a 993/S4). All are axial mount and are 30/36, 28/30 and 28/28. The 30/36 was used on 993RS the other 2 on 993tt & 993C4. There are 2 addditional versions of this size caliper which are radial mount and were originally used on 928S4 front and 993 front, hence the name 993/S4.