Peteinjp

My understanding at this point is that the only rear rotors that retain the parking brake are the stock size units and the offerings from brembo. Are there other options and if so what sizes?

Pete

Bill Verburg

That is correct

the oe size ones come in 2 versions, plain and drilled

993tt/RS 28x322s won't work w/ the stock p/b

aftermarket 2 piece that retain the p/b function need to be at least 330mm to provide enough meat to both the 2 pieces together
I've seen 330, and 350 2 piece from various suppliers always w/ an aftermarket caliper, usually a Brembo

Spyerx

yeah this is why I went with the brembo setup... that and more modern braking system for the eventual big power motor... wasn't cheap :-( But they work, very, very well. Amazing actually,

SR20Fastback

Any chance you have a link to the setup you bought? I'm not terribly far from venturing down that avenue.

Peteinjp

https://www.racetechnologies.com/pro...64-carrera-4-0

This is the 964 offerings. Spyerx and I are running 993rs front wheel carriers so the fronts are 993 brembos.

Most go with a 355mm front but If I go with the brembo I’ll probably go with the 332mm to save a bit of weight. Frustratingly I was not able to get them to tell me the piston sizes on the various calipers or I would already have ordered them.

Pete

Peteinjp

Thanks Bill- Basically I'm looking for the lightest combo available so 2 piece is the way to go. I have the 993rs carriers up front so the lightest combo up front would be the stock 993 caliper with 304mm 2 piece rotors from racingbrake- https://racingbrake.com/2519. That leaves the rear with the stock 4 pistons and disks. I'd love a 2 piece rotor in stock size....

Ultimately the Brembo it would only be a little heavier with 332 up front and 322 rear rotors but yes as Spyerx mentioned its expensive and for my application its a bit over kill- though pads would last longer so there's that.


Pete

-nick

993 rotors, hubs, wheel bearings, some light machining to the control arm bearing areas, and lower offset wheels. Saves almost 2lbs on each side and you can run early offset, deeper dished, rear wheels. I started down this path, but too much of a pain for me for the small weigh loss.

Bill Verburg

That 304 front is new and looks like a good alternative to the stockers. If using that or stock in front you want to use stock rears to retain balance and p/b

Spyerx

This is my setup, and links to current website pics. If you are looking into the Brembo kit options, give them a call if you can. I know you're in Japan, but if you want a contact at BBI let me know, they could help I'm sure get them for you. Also, there are a few new options, BBI has done another car similar to mine and has some different options on the braking with a Brembo GT kit.

Brembo GT Kit, 993 - slotted, red, TS20 pads - 1M2.8001A
http://www.racetechnologies.com/prod...0?vehicle=9673
1M2.8001A – 355x32mm slotted, w/6p Monobloc: 28/30/36mm pistons


Brembo GT Kit, 964 - slotted, red, TS20 pads - 2C2.6017A
http://www.racetechnologies.com/prod...0?vehicle=9511
2C2.6017A – 328x28mm slotted, w/4p: 28/30mm pistons

SR20Fastback

These are pornographic. Thanks for the links, looks like I need to look into the 993 carriers sooner rather than later.

-nick

The 304mm racingbrake rotors have been working great for me, though haven’t pushed them on the track yet (covid, etc...). It’s actually been a few years since they’ve been available. The weight is as advertised too. With standard 993 uprights, calipers, RSR style tie rods, and the RB rotors, it comes out to about a 4lb reduction on each side compared to the stock 964 bits.

Peteinjp

Thanks for all the input guys-


Nick- I assume your running stock brakes in the rear. What offset wheel were you looking at? Did you stay 17 for more lighter weight wheel tire combo or go up to 18?

Spyerx- I want to contact BBI and ask them to find out about the piston sizes for the 330mm setup. Then maybe a I can beg Bill to calculate the ratio cause I sure a hell can't! How do you feel about the front to rear balance with our set up? I don't mind the stock C2 (rear 2 piston) balance but I hope not to bring the bias more toward the front. Do the Brembo calipers require an adapter or to they fit right up?

Pete

Spyerx

the brembo use an adapter to the caliper. The braking feel and balance is excellent. The car has insane stopping power.
when i reached out to brembo about the piston sizes they said they target stock balance. For their c2 kits they state you need to use the 92+ bias valve or remove it
i called race tech and they had an engineer call me back w the piston data.

Peteinjp

What exactly is the difference between the 993 rear rotors and the 964? They use the same parking brake shoes....

Pete

-nick

An extra 28mm of iron in the hubs, and correspondingly more depth in the rotors too. That's an extra 2lbs on each rear corner for the 964. There's no reason for the extended 964 hubs, other than to keep the high offset rear wheels to match the high offset front wheels. Ever notice that you can fit a truck between the rear caliper and the spokes of the wheel?

I'm running matching 993 C2 rear calipers, with the larger pistons. So 993 calipers all around, and no bias valve. Brakes are even and bias feels good. Lots of autocross threshold braking tests



964 vs 993 rear hubs