993RS brakes

[Bill Verburg]

993RS
front rotor: 322x32, 20.5#, 2 piece(lighter al. hats are available)
front caliper: 4 piston, 36/44mm pistons, 151cm^2 pad area/caliper, 8,3#



rear rotor: 322x28, 18.2#, 1 piece
rear caliper: 4 piston, 30/36mm pistons, 125cm^2 pad area/caliper, 8#


pads, from back RS/tt front, RS/tt rear & 993 n/a front(same pad), 993n/a rear


calipers bottom c/w, RS/tt front, tt rear, RS rear, pads from bottom left c/w RS/tt front, RS/tt rear & n/a front, RS/tt rear & n/a front, n/a rear


front RS rear 30/36, back tt rear 28/28


n/a front rotor left RS/tt rotor right

[North Coast Cab]

Bill,
What makes them different than Big Reds? I don;t recall the Big Red rear rotor size, but it looks like th eonly other difference I can see is the 36/30 rear pistons instead of 34/30.

Man those would be great.

[mjshira]

Wow! Bill you are G-R-E-A-T at spending my money ;-)

[Bill Verburg]

Originally Posted by North Coast Cab

Bill,
What makes them different than Big Reds? I don;t recall the Big Red rear rotor size, but it looks like th eonly other difference I can see is the 36/30 rear pistons instead of 34/30.

Man those would be great.

The original "Big Reds" were the 964 3.6T fronts, which are the same in all respects except rotor o/s as the 993tt and 993RS front. 993tt and 993RS front calipers and rotors are the same. pictures & specs are above but once again;
993RS and 993tt front
front rotor: 322x32, 20.5#, 2 piece(lighter al. hats are available)
front caliper: 4 piston, 36/44mm pistons, 151cm^2 pad area/caliper, 8,3#, largest body

the back is where things vary a lot
964t rear
964t use a 299x28mm rotor, 30/34mm 4 piston, smallest body caliper, 6.5# w/o pads, pad area 86 cm^2/caliper

964RS rear
964RS use a 299x24mm rotor, 30/34mm 4 piston, smallest body caliper, 6.5# w/o pads, pad area 86 cm^2/caliper. 964t and 964RS rear calipers are not the same because of the rotor width 28mm vs 24mm

964n/a rear
964 n/a use a 299x24mm rotor, 28/30mm 4 piston, smallest body caliper, 6.5# w/o pads, pad area 86 cm^2/caliper. This caliper has the narrow 24mm throat and smallest pistons.

993n/a rear
993 n/a use 299x24mm rotor, 30/34mm 4 piston, smallest body caliper, 6.5# w/o pads, pad area 86 cm^2/caliper. Same small body narrow throat as 964 n/a but w/ the bigger pistons.

993tt rear
993tt use 322x28mm rotor, 28/28mm 4 piston, medium(actually barely smaller than Big Red front by 10mm in height), 8#w/o pads, pad area 125 cm^2/caliper.

993RS rear
993RS use 322x28mm rotor, 30/36mm 4 piston, medium(actually barely smaller than Big Red front by 10mm in height), 8#w/o pads, pad area 125 cm^2/caliper.

The 993tt and 993RS rear caliper uses the same pads as a 993n/a front i.e.the same medium large body but w/ axial mount ears rather than the 993n/a radial mount. The only difference between 993tt and 993RS rear is piston size 28/28 vs 30/36. This piston difference arises from the AWD vs RWD configuration of the cars.

Here is a pic of a 964t, small body caliper(left) and a 993tt, medium-large body caliper on a 309x28 930 rotor


here is a pic of the 3 different size pads, from left large 993tt/RS 151cm^2/caliper, medium-large 993n/a front & 993TT/rs rear 125cm^2/caliper, small 964t & 964RS & 993n/a rear 86 cm^2/caliper


clockwise from top right; 993tt, 965t, 911M, 911A


on left 993RS rear, on right 993RS front, the pads are the same length and thickness but the front is ~10mm taller

[Don Plumley]

I have brake envy...

[Bill Verburg]

you guys don't need this stuff

just posting a FYI because of recent questions and confusion

[JeremyD]

mmm brake porn - what a great way to start 2008!

[North Coast Cab]

Bill so is there a PV to handle the larger rear brake calipers on the RS?

[Bill Verburg]

Originally Posted by North Coast Cab

Bill so is there a PV to handle the larger rear brake calipers on the RS?

Yes, they all have one or two
ABD/LSD cars have 2, that includes all the AWD cars others have 1

n/a is 40 bar x1
RS is 40 bar x2
n/a AWD is 45 bar x2
tt is 55 bar x2

[cupcar#12]

Bill you mention there is a lighter rotor advaialble for 322x32 front rotor (which my car has) i am planning on updating the front caliper to 928S4 spec in the near future as well.

can you share the part # (or supplier) with me?

i would love to have a lighter solution for the rotors (front and rear)

[Bill Verburg]

The 993RS/tt rotor can be lightened by using an aluminum hat. Wrightwood racing used to have them, Chris Walrath has made some for either himself or a select few.

Other than that, AP makes a slotted 322x32 which will require a custom hat. I believe that CDOC is selling them now but the usuial distributer in the US is Essex in Ga.

[craig001]

Sure, I don't need it, but that doesn't stop me from drooling like my Great Dane at feeding time.

[Trophy]

Bill, Do you have a source for the rear RS calipers? What sort of price could i expect to pay for a pair?

[Bill Verburg]

Originally Posted by Trophy

Bill, Do you have a source for the rear RS calipers? What sort of price could i expect to pay for a pair?

Pelican can get any oem part including 993RS as long as the parts are still available.

993 352 425 80 left caliper
993 352 426 80 right caliper

Pelican shows just under $600ea

[Trophy]

Bill,

Sorry for the late thank you, but THANK you.

Regards

[North Coast Cab]

Quote:
Originally Posted by North Coast Cab
Bill so is there a PV to handle the larger rear brake calipers on the RS?

Yes, they all have one or two
ABD/LSD cars have 2, that includes all the AWD cars others have 1

n/a is 40 bar x1
RS is 40 bar x2
n/a AWD is 45 bar x2
tt is 55 bar x2

Bill, Can you clarify this a little?
I currently have a 993 set-up on my car. I also have a 993TT big red set-up of calipers and rotors, and am considering changing the rear calipers to the RS. Or should I stick with the 993 rear which has bigger pictons than the TT rear?

So, Can you explain the potential PV change(s) going to the all 993TT, 993TT front 993 rear, as well as to the RS set-up?

Thank you much, your knowledge is greatly appreciated.

John

[Bill Verburg]

Originally Posted by North Coast Cab

Bill, Can you clarify this a little?
I currently have a 993 set-up on my car. I also have a 993TT big red set-up of calipers and rotors, and am considering changing the rear calipers to the RS. Or should I stick with the 993 rear which has bigger pictons than the TT rear?

So, Can you explain the potential PV change(s) going to the all 993TT, 993TT front 993 rear, as well as to the RS set-up?

Thank you much, your knowledge is greatly appreciated.

John

I would use the 322x28 993RS/tt rear rotors, W/ M220 you have 2x 40 bar w/o M220 you have 1x40 bar p/v I have used the tt 28/28 and RS 30/36 rear calipers, I prefer the 30/36 but lsd makes a difference too i have a PMS 40/65 you can use more rear brake w/ a more aggressive deceleration lock, but the tt is more available, either works well both better than leaving the stock 299x24 w/ 30/34

Rear bias is not just a function of piston sizes. Rotor diameter and pad choice also have effects.

[North Coast Cab]

Wheels are still turning.

993NA Brake Option Summary

Option #1
F - 993 NA Calipers 36/44 & Rotors 304x32
R – 993 NA Calipers 30/34 & Rotors 299x24
PV – 40 #?

Option #2
F - 993TT Calipers 36x44 & Rotors 322x32
R – 993 NA Calipers 28x30 & Rotors 299x24
PV – ?

Option #3
F – 993TT Calipers 36/44 & Rotors 322x32
R – 993TT Calipers 28/28 & rotors 322x28
PV – M220 ?

Option #4
F – 993TT Calipers 36/44 & Rotors 322x32
R – 993RS Calipers 30/36 & 993TT Rotors 322x28
PV – 40 #?

Questions:
1) Is a 993NA rear caliper and rotor a better option than a 993TT rear caliper and rotor when a 993TT front caliper and rotor is used? Larger pistons, smaller rotor.
2) The 993TT and 993RS appear to have a different M/C than the 993NA, is this an issue that would need to be addressed as well?
3) Also, I can’t seem to find the P/V’s in PET in order to clarify the part numbers for each system.

Thanks, John

[Bill Verburg]

1) Is a 993NA rear caliper and rotor a better option than a 993TT rear caliper and rotor when a 993TT front caliper and rotor is used? Larger pistons, smaller rotor

That's close to what 964RS or 964t used w/ a 55bar p/v. I've never used it but prefer the 322x28 rear.

The 993TT and 993RS appear to have a different M/C than the 993NA, is this an issue that would need to be addressed as well?

The RS/TT use a 25.4mm electro hydraulic boosted m/c, n/a uses a 23.8mm. The 25.4 will give you a slightly better pedal feel but installing the system in a vac boosted car is tres expensive and IMO not worth it. I have a 23.8 no boost in the C# w/ 993rS brakes and the stock 23.8 vacuum boosted in the 993, they both work well w/ no issues.

3) Also, I can’t seem to find the P/V’s in PET in order to clarify the part numbers for each system

for 993 MG6 SG5

[Trophy]

Bill,

Another question for you...

How would the combination of 993TT front calipers and Rotors go with 993na Front calipers on rear with 993TT Rotors.

I understand the piston size would be the same front and rear and that the caliper for the rear would require an adapter.

your thoughts?

Regards