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Please help me ID these brake calipers...

 
Old 12-07-2018, 07:25 PM
  #16  
Bill Verburg
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Originally Posted by C4TT View Post
So it's 964 RS rear caliper or 993 big red, but then no parking brake?
I'm surprised there isn't an aftermarket fix for this.

Thanks
Back in post #7 I outlined the viable choices
It's doubtful that you can find 964RS rears so most are using 993 rears as a functional equivalent, there are some minor cosmetic differences aside from being black. These are the best currently available option for you. 964 t rears won't work at all and the correct big reds though they bolt on require 322x28mm rotors that won't work w/ your oe parking brakes.
and yes the parking brake still works because you are keeping stock 964 rotors in back
The 993 rears bolt on, use stock size rotors(either stock or the drilled ones of the same size used on 964RS) and help but don't totally solve the bias issue.

There are 2 big red rears
993tt are 28/28 and the 993RS which are 30/36, both use the same 322x28mm rear rotor w/ parking brake integral to the hub, neither works w/ a 964 parking brake. Of the 2 the 993RS is the best match for the big red fronts.

There may be aftermarket options but you will have to do the research, just as a point of interest I use 993RS big reds all around on my 2 cars, for the track car I have looked into bigger f/r combos but there are no reasonably priced ones out there.
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Old 12-07-2018, 07:30 PM
  #17  
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Originally Posted by C4TT View Post
I just measured the rear pistons which came in at 26mm for the top and 30mm for the bottom piston.

The old Pagid reds measure 16mm front and 15.5mm rear in total pad thickness. So clearly the rear is working harder, granted the weight is greater in the back.
You are not measuring the correct part
here is a piston and dust seal


The piston is measured at the bottom not the prt visible around the dust seal, stock 964 fronts are 36/40, stock 964 rears are 28/30, stock big red fronts are 36/44, stock 993 and 964RS rear are 30/34 as is the stock 964t but this one is also wider. Stock 993RS big red rear is 30/36, stock 9993tt big red rear is 28/28
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Old 12-12-2018, 12:41 PM
  #18  
C4TT
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Originally Posted by Bill Verburg View Post
You are not measuring the correct part
here is a piston and dust seal


The piston is measured at the bottom not the prt visible around the dust seal, stock 964 fronts are 36/40, stock 964 rears are 28/30, stock big red fronts are 36/44, stock 993 and 964RS rear are 30/34 as is the stock 964t but this one is also wider. Stock 993RS big red rear is 30/36, stock 9993tt big red rear is 28/28
Bill,
Sincere thanks for your patience, knowledge and willingness to help. I measured again. Fronts came in at 36/44 and rears are 30/34, so I guess I have stock 993 brakes all around.
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Old 12-13-2018, 11:01 AM
  #19  
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You will need to measure the opening for the pads to verify of you have 964 RS or Turbo rears. The 993's are a cleaner looking caliper without the lines top and bottom of the raised pad for the lettering.

Most likely you have brakes from a turbo 3.6. Here is a rear 3.6T caliper measurements. Note the 1.21" or 30.7mm opening for the 28mm rotor vs 24mm rotor.





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Old 12-13-2018, 02:20 PM
  #20  
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Originally Posted by cobalt View Post
You will need to measure the opening for the pads to verify of you have 964 RS or Turbo rears. The 993's are a cleaner looking caliper without the lines top and bottom of the raised pad for the lettering.
The 964RS rear are actually the same clean design as was used on 993, though It is possible that early ones looked more like the regular 964

These are oe 964RS, they have been painted red, but otherwise as pulled from the car
Here are the 964RS specific parts, iron wheel carriers(shared w/ 964t, rear rotors 24x299/drilled(from M030 951), front 32x322/drilled rotors, front 36/44 calipers w/ built in mounting stands, rear 30/34calipers





On left a std 964 rear 28/34 for 24x299mm rotor, on right a painted 964t 30/34 for 28x299mm rotor, as Anthony says unless you know what to look for best to measure, the fronts will have the same width and general appearance as the 964t rear and want a 28x298mm rotor but will have bigger 36/40mm pistons

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