Brakes

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A summary of calipers;

Late Brembo

Caliper	PCCB Ceramic	PCCB Ceramic	GT2 front	GT3 front	Big Red	S4 front	S4 rear	S4 rear	S4 rear	GT2 rear	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

pad area cm² per caliper			~154	153	151	112.5	112.5	112.5	112.5			86	86	86	86	56
pad width (mm)					132	132	132	132	132			98	98	98	98	98
pad height (mm)					58	48	48	48	48			44	44	44	44	44
pad thickness (mm)					12	12	12	12	12			12	12	12	12	12

caliper weight w/o(w) pads lbs					(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	6	4	4	4	4	4	4	4	4	4	4	4	4	2
					44/36	44/36	36/30	30/28	30/28	30/28	30/28	40/36	30/28	30/34	30/34	44
	monobloc	monobloc	ceramic inserts							ceramic inserts
rotor (mm)	350x34 v,perf	350x28 v,perf	330x34 or 350x34	330x34	322x32	304x32	322x28	322x28	322x28	330x28	330x28	298x28	299x24	299x28	299x24	299x24
rotor wt lbs	~12	~11	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

Wide M

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"

trans 3.5'

trans 3"

pad area cm² per caliper

52.5

pistons

38/38

30/30

2x48

2x42

2x48

2x38

2x48

2x38

2x35

pad thickness (mm)

caliper weightw/o(w) pads

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

rotor weight

17.25

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

	'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.	9" vac	hyd.	hyd.	hyd.	8" vac	8" vac	hyd.	hyd.
Boost Coeff.	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	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	22.5/13	20/12	20/12	20/12	20/16	20/16	20/12	20/12
Prop. Valve bar		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)	322x32	322x32	322x32	304x32	304x32	322x32	322x32	322x32	298x28	298x28	298x28	298x28
Caliper front	Big Red	Big Red	Big Red	S4	S4	Big Red	S4	S4	basic	basic	basic	basic
Pistons (mm) Trail	44	44	44	44	44	44	44	44	40	40	40	40
Lead	36	36	36	36	36	36	36	36	36	36	36	36
Pad area frt. axle (cm²)	302	302	302	250	250	302	250	250	172	172	172	172
pad width (mm)	132	132	132	132	132	132	132	132	98	98	98	98
pad height (mm)	58	58	58	48	48	58	48	48	44	44	44	44
pad thick. frt (mm)	11	11	11	11	11	12	12	12	12	12	12	12

Rotors rear (mm)	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	36	30	30	34	34	34	34	30	44	30	34
L	28	30	28	28	30	30	30	30	28		28	30
pad area rr axle (cm²)	250	250	250	172	172	172	172	172	172	112	172	172
pad width (mm)	132	132	132	98	98	98	98	98	98	98	98	98
pad height (mm)	48	48	48	48	44	44	44	44	44	44	44	44
pad thick. rr (mm)	12	12	12	12	12	12	12	12	12	12	12	12

pad area total (cm²)	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

Hyd. Bias Ratio	2.061	1.472	1.919	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	14.9	16.8	15.2	15.2	18.7	18.7	18.7	16.4	21.5	22.7	16.2	17.5

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.

Booster 8" vac 8" vac 8" vac 8" vac 8" vac 7" vac pedal ratio 5.2 none

Booster Coefficient 2.22 3 2.22 3 3 2.22 NA NA

Master Cylinder (mm) 23.81 23.81 20.64 23.81 23.81 20.64 19.05 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 55 NA NA NA NA

           reduction factor 0.46 0.46 0.46 0.46 NA NA NA NA

rotors front 304x32 304x32 282.5x24 304x32 304x32 282.5x20 282.5x20 304x32

caliper front 930 930 wide A 930 930 A A

pistons (mm) leading 38 38 48 38 38 48 48 40

                    trailing 38 38 38 38 36

pad area front axle (cm²) 188 188 152 188 188 152 152 172

      pad width (mm) 98 98 78 98 98 78 78 98

      pad thickness front (mm) 13 13 10 13 13 10 10 12

rotors rear (mm) 309x28 309x28 290x24 309x28 309x28 290x20 290x20 309x28

caliper rear 930 930 wide M 930 930 M M

pistons (mm) leading 30 30 42 30 30 38 38 30

                    trailing 30 30 30 30 28

pad area rear axle (cm²) 188 188 105 188 188 105 105 172

      pad thickness rear (mm) 13 13 10 13 13 10 10 12

      pad width (mm) 98 98
78
98 98
78

78

98

pad area total (cm²) 376 376 257 376 376 257 257 344

parking brake (mm) 180x25 180x25 180x25 180x25 180x25 180x25 180x25 180x25

Hydraulic Bias Ratio 1.604 1.604 1.306 1.604 1.604 1.596 1.596 1.720

effective H.B.R. with prop. valve 2.971 2.971 2.419 2.971

slave/master ratio 16.5 16.5 19.1 16.5 16.5 17.6 20.7 16.2

04/09/05