ROG100

Anthony,
That's why I asked for you to clarify the numbers in Post #4.
These are Big Red Rears.
Nice to know the number for the fronts to be certain.
Roger

cobalt

I stand corrected. I too am rushing too much. for some reason I read 993.351.425(426).10 you posted 993.352.425(426) the 352 is the rear the 351 is the front. I guess I looked at the 425 and 426 to verify the correct P/n and should have looked at the entire #.

My bad.

SeanR

Blaa Rog, those are repainted..........

ROG100

Not your bad at all - just me mixing up numbers.
I did want to confirm which was which.

993 351 425 & 426 10 are the fronts and 993 352 425 & 426 10 are the rears.

Vilhuer

Even if you aren't bad enough driver it doesn't mean everyone else can also drive. Of course main thing is that they look much better than small S4 etc. rear calipers but side effect is that they can stand more heat also.

mark kibort

I think some of that first sentence was lost in the translation, but that's ok, I know what you mean. (a little back slap) My point is that i dont think the braking force needed in our chassis would demand any rear brake power that the rear calipers cant handle. I laughed, because im still waiting for my rears to wear out They would look very cool though!

mk

Jim M.

I installed 993TT rear brake calipers and rotors after the caliper was machined to correctly center on the 993TT rotor. The parking brake system was not touched and works perfectly. The only thing I did not do was install the brake backing plates.

The GTS, GT, S4, 944T, 944S2, 968, 911RS America and I believe the later 911 C2/4 rear brakes are all the same. The master cylinders for all the water cooled cars prior to the 996 are the same. Therefore it's my opinion that the rear upgrade could be done on all of these cars if the owner so desired.

Lastly, the S4 through the GTS has great brakes and the only reason I did the upgrade was bling. The old brakes just looked to small in my 18" wheels. No one should be doing this for braking improvement because the current brakes will easily lock up the biggest wheels/tires any of us have on our cars.

cobalt

Thank you that is interesting info.

I need to take things apart this winter and compare the GTS/turbo and C2. I know on the turbo and C2 although the parts are similar the rear parking brake is lost with the 993TT rear caliper and rotor upgrade. Will need to look into the reasoning although I know of several who have done this and each claims the rear parking brake was disconnected to make it work.

I agree the larger rear pad and rotor will dissipate heat better but I find even with a 2 driver car my C2 with big red fronts and 993C2 rears using RS rotors has more braking than the R888's I use can handle. I loose traction long before I loose braking. So it is either time for wider rubber and more down force or I need to move up to the R6's. The turbo on the other hand seems under braked with the big/little reds and could use some more stopping power. Extra HP does that sometimes.

If you get a chance can you post a pic or a link to a thread (search is useless) showing how the rotor sits from behind without a wheel. IIRC before I sold the rear rotors to Heinrich I measured the hats and the GTS hat was close to 3/4" taller than the 993TT. Would be interesting to see how they sit in comparison to stock.

John Veninger

Erkka wrote:
I know that, I was really commenting on why anyone would need that much brake on the back of their 928.

Jim M.

I don't have a picture at that angle, but I plan to be back in the rear W/W's after the holidays, so I'll get some pics from the rear at that time.

cobalt

Thanks Jim,

have a Happy Holiday

Ghostcloak

Where is the part number located on the caliper? I looked on the inside and the only number I see is 20.5249.00. Am I going blind?

RKD in OKC

Rear brake thoughts...

After aggressive driving events both my front and rear rotors are blue.

GTS, stock front rotors, cross drilled rear rotors, EBC yellow pads, 5/55 bias valve.

cobalt

That is a casting number. the part numbers were placed on them with a paper tag more than likely long since gone.

Blue huh? Might try a different pad. I am now running aluminum hats and slotted rotors on my Big red setup for my C2 dual driver track car and I am getting 5-6 track days out of a set of Pagid oranges so aggressive driving and my rotors never changed colors. the factory cast hole rotors did crack but never bad enough for concern.

You might also try ducting them for better cooling.

Ghostcloak

So that's what that was... I see part of a sticker, well it's just glue residue and some paper. I figured that may have been the part #. Thanks.