Design - Abs - Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual

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928
Antiblock
System
45
DESIGN
The major components
of ABS are:
hydraulic
unit,
electronic
control
unit,
four speed sensors
l
and
wire harness with relays and
overvoltage
tripout
(on central electric
board).
These components
are integrated
in the conventional
braking system of cars beginning
with
1984 models. The conventional
braking system of cars beginning
with
1984 models has
been changed as compared to that of older models in brake circuit
division
(now by axles),
stepped brake master cylinder
(piston diameter of both pistons formerly
the same) and brake
force regulator
(see page 47 - la a).
1 - Brake booster with tandem master cylinder
2 - Front speed sensors *
3 - Hydraulic
unit (with screwed in brake force regulator,
pump motor and valve relay)
4 - Electronic
control
unit
5 - ABS indicator
lamp
6 - Rear speed sensors *
* A pulse gear belongs to each speed sensor. Pulse gears are pressed on front wheel hubs
of front axle and machined
on axle shafts of rear axle.
Printed in Germany - VIII,
1984
Design - ABS
45
03

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1986 9281985 928928

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