Isuzu Trooper (1998-2002 year). Service manual — part 217
5C – 20 POWER ASSISTED BRAKE SYSTEM
Front and Rear Brakes
N·m (kg·m/lb·ft)
74(7.5/54)
Front disc brake
Rear disc brake
35(3.6/26)
74(7.5/54)
155(15.8/115)
35(3.6/26)
104(10.6/77)
44(4.5/32)
8(0.8/69 Ib
・in)
8(0.8/69 Ib
・in)
POWER ASSISTED BRAKE SYSTEM 5C – 21
SPECIAL TOOLS
ILLUSTRATION
PART NO.
PARTNAME
Primary piston holder
5-8840-2306-0
(including master cylinder attach-
(J-39242)
ment and master cylinder plug)
5-8840-0277-0
Radiator cap tester
(J-24460-01)
5-8840-2300-0
Push rod gauge
(J-39216)
5-8840-0279-0
Vacuum pump
(J-23738-A)
5-8840-2305-0
Push rod support
(J-39241)
5C – 22 POWER ASSISTED BRAKE SYSTEM
GENERAL DESCRIPTION
MASTER CYLINDER
The master cylinder contains two pistons that supply
the hydraulic pressure for a dual-circuit braking
system. The primary piston provides the fluid
pressure to the front brakes, while the secondary
piston provides the fluid pressure to the rear brakes.
If the pressure is lost from either system, the
remaining system will function to stop the vehicle.
CAUTION:
1) The master cylinder is not repairable. If found
defective, it must be replaced as complete
assembly.
2) If any hydraulic component is removed or
disconneted, it may be necessary to bleed all or
part of the brake system.
3) The torque values specified are for dry,
unlubricated fasteners.
4) Perform service operations on a clean bench free
from all mineral oil materials.
330RW013
POWER ASSISTED BRAKE SYSTEM 5C – 23
VACUUM BOOSTER
This booster is a tandem vacuum unit with a diaphragm effective diameter 205 mm + 230 mm (gasoline
engine model) / 180 mm + 205 mm (diesel engine model). In normal operating mode, with the service
brakes in the released position, the tandem vacuum booster operates with vacuum on both sides of its
diaphragms. When the brakes are applied, air at atmospheric pressure is admitted to one side of each
diaphragm to provide the power assist. When the service brake is released, the atmospheric air is shut
off from the one side of each diaphragm. The air is then drawn from the booster through the vacuum
check valve to the vacuum source.
CAUTION:
1) If any hydraulic component is removed or disconnected, it may be necessary to bleed all or part of
the brake system.
2) The torque values specified are for dry, unlubricated fasteners.
3) The vacuum booster is not repairable and must be replaced as complete assembly.
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