Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1189
POWER-ASSISTED BRAKE SYSTEM
5C–23
Visual Check
Make parts replacement as required if wear, distortion,
nicks, cuts, corrosion, or other abnormal conditions are
found through the following parts inspection:
• Master cylinder body
• Fluid reservoir
• O–ring
• Wash each part in brake fluid before beginning the
inspection procedure.
• Check the inside surfaces of the master cylinder for
abrasion, corrosion, and other damage. Replace the
cylinder if necessary.
• Check the return port for clogging. Clean the port with
a wire and compressed air if nesessay.
• Check the piston and piston cup for abrasion,
damage, and wear. Replace the piston assembly if
any of these conditions exist.
• Check the return spring. Replace the spring if it is
weak.
• Check the snap ring. Replace the snap ring if it is
stretched or weak.
Reassembly
1. Wash each master cylinder internal part in brake
fluid before beginning installation.
2. Install the cylinder body.
3. Press the secondary piston assembly into the
cylinder body and hold it. Thread the pin through the
long hole of the piston to secure the piston
assembly.
4. Install the primary piston assembly.
5. Install the snap ring.
6. Install the O–ring
7. Install the reserve tank and the reserve tank cap.
8. Install the spring pin.
Installation
1. Install master cylinder.
When replacing the master cylinder or vacuum
booster or both, always measure the vacuum
booster push rod protrusion and adjust it as
necessary (Refer to Vacuum Booster in section).
2. Install P&B valve and bracket.
3. Install 2 attaching nuts and tighten the attaching
nuts to the specified torque.
Torque: 13 N·m (113 lb in)
4. Install brake pipes and tighten the brake pipe to the
specified torque.
Master cylinder and P&B valve sides
Torque: 12 N·m (104 lb in)
Others
Torque: 16 N·m (12 lb in)
5. Connect electrical connector.
5C–24
POWER-ASSISTED BRAKE SYSTEM
Main Data and Specifications
General Specifications
Torque Specifications
E05R200005
Type
Dual–circuit
Piston bore
diameter
25.4 mm (1.000 in)
POWER-ASSISTED BRAKE SYSTEM
5C–25
Vacuum Booster Assembly
Vacuum Booster Assembly and
Associated Parts
331R200004
EndOFCallout
Removal
1. Before removing the vacuum booster assembly,
disconnect and remove the brake pipes.
2. Remove master cylinder, refer to Master Cylinder
Removal in this section.
CAUTION: When removing the master cylinder
from the vacuum booster, be sure to get rid of the
internal negative pressure of the vacuum booster
(by, disconnecting the vacuum hose) in advance.
If any negative pressure remains in the vacuum
booster, the piston may possibly come out when the
master cylinder is being removed, letting the brake
fluid run out.
Do not hold the piston while removing the master
cyliner, the piston can be easily pulled out.
Outside surface of the piston is the surface on
which seals are to slide. Care should be taken to
keep the surface free of cuts and dents.
3. Remove vacuum hose.
4. Disconnect the yoke clevis from the brake pedal.
5. Remove vacuum booster fixing nut.
6. Remove vacuum booster.
Legend
(1) Pin
(2) Vacuum Booster Fixing Nut
(3) Vacuum Hose
(4) Master Cylinder
(5) Vacuum Booster
(6) Snap Pin
5C–26
POWER-ASSISTED BRAKE SYSTEM
Inspection and Repair
Vacuum Hose (The built in check valve)
1. Inspect the check valve (2), which is installed inside
the vacuum hose.
2. Air should pass freely from the vacuum booster (3)
to the engine (1).
3. Air should not pass from the engine (1) to the
vacuum booster (3). If it does, the check valve is
inoperative and the vacuum hose built in the check
valve must be replaced.
HEC ENGINE
360RW001
6VD1 ENGINE
360RY00004
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