Porsche 1972 911 Workshop Manual page 541

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G E N E R A L D A T A
D e s c r i p t i o n
S e r v i c e b r a k e s
(foot- operated)
Brake booster dia.
Brake master cylinder dia.
Brake disc dia. front
,
rear
Eff. brake disc dia. , front
rear
Brake caliper piston dia. , front
Brake pad area/each front wheel
Brake pad area/each rear wheel
Total pad area
Pad thickness, front
rear
Brake disc thickness when new
Front
Rear
Min. brake disc thickness after machining
Front
Rear
Max, brake disc thickness tolerance
Max, brake disc lateral runout
Max. brake disc lateral runout when installed
Max. peak-to-valley surface finish after
machining
Play a t brake pedal with brakes bled and engine
stopped
*
Brake discs must always b e machined on both sides by the same amount.
f r o m 1 9 7 8 M o d e l
rear
*
T e c h n i c a l D a t a
S p e c i f i c a t i o n s
Hydraulic dual circuit brake system, separate
circuit for each axle, brake booster, inboard
vented brake discs on front and rear axles
7 inches
282.5 m m
290 m m
228 m m
244 mm
48 m m
38 m m
2
2
5 2 . 5 crg
257 c m
1 0 m m
10 m m
20. 5 m m
20.0 m m
1 8 . 6 m m
0.02 mm
0 . 0 5 m m
0 . 1 m m
0.006 m m
10 m m
9 1
W e a r L i m i t s