A summary of calipers

     Late Brembo

Caliper

PCCB Ceramic PCCB Ceramic 993 GT2 Evo   front 2010 GT3 front Big Red S4 front S4 rear S4 rear S4 rear 993 GT2 Evo rear 2010 GT3 rear basic 964 front basic 964 rear basic 964T rear basic 993 rear 2 piston 964 rear

type of mount

radial radial radial radial radial radial axial axial axial radial radial axial axial axial axial axial
front rear    

pad area cm2 per caliper

      106 151 112.5 112.5 112.5 112.5   19 86 86 86 86 56
   pad width (mm)        190 132 132 132 132 132 132 130 98 98 98 98 98
   pad height (mm)       102 75 71 71 71 71 75  76 66 66 66 66 66

   pad thickness (mm)

       18 12 12 12 12 12  18-24 19 12 12 12 12 12

 

                               
caliper weight w/o(w) pads lbs (12.7) 5.4(7.8)     (10.8) 8.25(10.5) 8.25(10.5) 8.25(10.5) 8.25(10.5)     6.5(8) 6.5(8) 6.5(8) 6.5(8)  

pistons

6 4 4 6 4 4 4 4 4 4 4 4 4 4 4 2
  28/32/34 28/30 36/40 28/30/32 44/36 44/36 36/30 28/28 30/28 28/28 34/34 40/36 30/28 30/34 30/34 44
  monobloc monobloc ceramic inserts             ceramic inserts            

rotor (mm)

350x34  v,perf 350x28 v,perf 380x32 380x34 322x32 304x32 322x28 322x28 322x28 330x28 350x28 298x28 299x24 299x28 299x24 299x24
rotor wt lbs ~12 ~12 25 27 18 14 19.75 19.75 19.75              

Original chassis

996tt 996tt GT2 front GT3 front 993 RS frt 993tt frt 993 C4 frt 993 C2 frt 993 RS rr. 993tt rr. 993C4S rr. GT2 rear GT3 rear 964 frt 993 C4 rr, 964t/tl rr. 993 C2 rr 964RS rr.   964 C2 rr

  Early 930,911

Caliper

930 front 917 front 930 rr 917 rr Wide A A Wide M S M rr   M frt  Narrow M fnt Wide   L    rr Narrow  M  rr Narrow  L  rr

type of mount

trans 3.5" trans 3.5" trans 3.5" trans 3.5 trans 3.5" trans 3.5" trans 3" trans 3.5' trans 3" trans 3" trans 3" trans 3" trans 3" trans 3"

pad area cm2 per caliper

94   94   76 76 52.5 78 52.5 52.5 52.5 40 52.5 40

pistons

38/38 38/38 30/30   2x48 2x48 2x42 2x48 2x38 2x48 2x48 2x38 2x38 2x35

pad thickness (mm)

13   13   10 10 10 13 10          
caliper weightw/o(w) pads 8.26(10.3)   8.26(10.3)     9.5(11)     7(8)          

rotor (mm)

304x32v/d 304x32 309x28v/d   282.5x24v 282.5x20v 290x24v 282.5x20v 290x20v 282.5x20v 282x18solid 290x20v 290x18s 290x18s
rotor weight 14   17.25     8     12          

Original chassis

78-89 930 917 78-89 930   84-89 911 76-83 011 84-89 911 69-75 911 69-83 911 67-73 911 64-67 911* 66-68 911* 68-69 911* 64-67 911*

*mixture of uses T,E,S, Sportmatic etc.

 

 Summary of brake systems used in various chassis;

  Late model(thru'95) 964/993

 

993 GT2 Rennversion '97

'96-98 993 Twin Turbo

  '94-95 993 RS

'96-98 993 C4S

'94-95 993 C4

'94-95 993 C2, C2S

'94 964 Turbo 3.6

'92-94964 TL & 3.3T

'92-93 964 RS

'93-94 964 RSA C2

'90-91 964 C2 2pist rr

'89-94 964 C4

964 C4 TL

Booster

hyd

hyd.

hyd.

hyd.

hyd.

9" vac

hyd.

hyd.

hyd.

8" vac

8" vac

hyd.

hyd.

Boost Coeff.

3.6

3.6

3.6

3.6

4.8

3.15

4.8

4.8

3.6

3

3

4.8

4.8

Master Cylinder (mm)

25.4

25.4

25.4

25.4

25.4

23.81

23.81

23.81

25.4

20.64

20.64

23.81

23.81

Mast. Cyl. Stroke (mm)

17/15 

17/15

17/15

17/15

17/15

22.5/13

20/12

20/12

20/12

20/16

20/16

20/12

20/12

Prop. Valve bar

none

55

40

 40

40

40

60

60

55

55

45

55

33

     reduction factor

 

 

0.46

 

0.46

0.46

0.46

0.46

0.46

0.46

0.46

0.46

0.46

Rotors front (mm)

380x32 2piece alum. hat

322x32 2piece steel hat

322x32

322x32

304x32

304x32

322x32

322x32

322x32

298x28

298x28

298x28

298x28

Caliper front

993 351 427 82 left 993 351 428 82 rt

Big Red

Big Red

Big Red

S4

S4

Big Red

S4

S4

basic

basic

basic

basic

Pistons (mm) Trail

42

44

44

44

44

44

44

44

44

40

40

40

40

                     Lead

34

36

36

36

36

36

36

36

36

36

36

36

36

Pad area frt. axle (cm2)

 302

302

302

302

250

250

302

250

250

172

172

172

172

    pad width (mm)

 132

132

132

132

132

132

132

132

132

98

98

98

98

    pad height (mm)

 58

58

58

58

48

48

58

48

48

44

44

44

44

    pad thick. frt  (mm)

18-24

18

18

18

18

18

18

18

18

18

18

18

18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rotors rear (mm)

322x28

322x28

322x28

322x28

299x24

299x24

299x28

299x28

299x24

299x24

299x24

299x24

299x28

Caliper rear

 

S4

S4

S4

basic

basic

basic

basic

basic

basic

2 pist

basic

basic

Pistons (mm) T

28

28

36

28

30

34

34

34

34

30

44

30

34

                     L

28

28

30

28

28

30

30

30

30

28

 

28

30

pad area rr axle (cm2)

 250

250

250

250

172

172

172

172

172

172

112

172

172

   pad width (mm)

132

132

132

132

98

98

98

98

98

98

98

98

98

   pad height (mm)

48

48

48

48

48

44

44

44

44

44

44

44

44

   pad thick. rr (mm)

18

12

12

12

12

12

12

12

12

12

12

12

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pad area total (cm2)

552

552

552

552

422

422

474

422

422

344

284

344

344

 

 

 

 

 

 

 

 

 

 

 

 

 

 

parking brake (mm)

 180x25-

180x25

180x25

180x25

180x25

180x25

180x25

180x25

180x25

180x25

180x25

180x25

180x25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hyd. Bias Ratio

 1.862

2.061

1.472

2.061

1.919

1.572

1.572

1.572

1.572

1.720

1.496

1.720

1.409

effective H.B.R. with prop. valve

 

3.554

2.725

3.554

3.554

2.911

2.911

2.911

2.911

3.185

2.770

3.185

2.608

 

 

 

 

 

 

 

 

 

 

 

 

 

 

slave/master ratio

 27.826

29.760

33.654

29.760

30.479

37.311

37.342

37.342

32.786

43.171

45.546

43.171

34.122

   

Early 930,911

 

'84 930

'85-87 930

'84-89 Carrera 3.2

'82-83 930

'78-81 930

'77-83 911

'76 Carrera 3.0 & 69-76 S

'76 Carrera 3.0 mod.1

76 Carrera 3.0 mod.2

Booster

8" vac

8" vac

8" vac

8" vac

8" vac

7" vac

pedal ratio 5.2

none

none

Booster Coefficient

2.22

3

2.22

3

3

2.22

NA

NA

NA

Master Cylinder (mm)

23.81

23.81

20.64

23.81

23.81

20.64

19.05

23.81

23.81

 Master Cylinder Stroke (mm)

18/14

18/14

20/12

18/14

18/14

20/12

18/13

 

 

Proportioning Valve (bar)

33

55

33

NA

NA

NA

NA

NA

NA

           reduction factor

0.46

0.46

0.46

0.46

NA

NA

NA

NA

NA

rotors front

304x32

304x32

282.5x24

304x32

304x32

282.5x20

282.5x20

304x32

322x32

caliper front

930

930

wide A

930

930

 A

 A

964 front

993RS front

pistons (mm) leading

38

38

48

38

38

48

48

40

44

                    trailing

38

38

 

38

38

 

 

36

36

pad area front axle (cm2)

188

188

152

188

188

152

152

172

302

      pad width (mm)

98

98

78

98

98

78

78

98

132

      pad thickness front (mm)

13

13

10

13

13

10

10

12

11

rotors rear (mm)

309x28

309x28

290x24

309x28

309x28

290x20

290x20

309x28

322x28

caliper rear

930

930

wide M

930

930

M

M

964 rear

993RS rear

pistons (mm) leading

30

30

42

30

30

38

38

30

30

                    trailing

30

30

 

30

30

 

 

28

36

pad area rear axle (cm2)

188

188

105

188

188

105

105

172

250

      pad thickness rear (mm)

13

13

10

13

13

10

10

12

11

      pad width (mm)

98

98

78

98

98

78

78

98

132

pad area total (cm2)

376

376

257

376

376

257

257

344

552

 

 

 

 

 

 

 

 

 

 

parking brake (mm)

180x25

180x25

180x25

180x25

180x25

180x25

180x25

180x25

18x25

 

 

 

 

 

 

 

 

 

 

Hydraulic Bias Ratio

1.604

1.604

1.306

1.604

1.604

1.596

1.596

1.720

1.472

effective H.B.R. with prop. valve

2.971

2.971

2.419

 

 

 

 

 

2.725

 

 

 

 

 

 

 

 

 

 

slave/master ratio

33.105

33.105

38.345

33.105

33.105

35.328

41.311

32.342

138.331

 

911 Brake torque for various setups @70bar line pressure

 993/964 setups

 

 

 

This site was last updated 04/04/07