Isuzu 2000 Trooper Workshop Manual page 653

CAUTION:
1. The master cylinder is not repairable. If found
defective, it must be replaced as a complete
assembly.
2. If any hydraulic component is removed or
disconnected, it may be necessary to bleed all or
part of the brake system. (Refer to "On–Vehicle
Service" in this section.)
Brake Booster
This booster is a tandem vacuum unit with a diaphragm
effective diameter 205mm + 230mm. 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
unlubricated fasteners.
3. The vacuum booster is not repairable and must be
replaced as a complete assembly.
specified are for dry,
POWER ASSISTED BRAKE SYSTEM
3. The torque values
un-lubricated fasteners.
4. Perform service operations on a clean bench free
from all mineral oil materials.
Disc Brake
The disc brake assembly consists of a caliper, piston,
rotor, pad assembly and support bracket. The caliper
assembly has a single bore and is mounted to the support
bracket with two mounting bolts. The support bracket
allows the caliper to move laterally against the rotor. The
caliper is a one–piece casting with the inboard side
containing the piston bore. A square cut rubber seal is
located in a groove in the piston bore which provides the
hydraulic seal between the piston and the cylinder wall.
NOTE:
1. Replace all components included in repair kits used to
service this caliper.
2. Lubricate rubber parts with clean brake fluid to ease
assembly.
3. If any hydraulic component
disconnected, it may be necessary to bleed all or part
of the brake system.
4. Replace pads in axle sets only.
5C–3
specified are for dry,
331RS001
is removed or