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Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
1
Front hydraulic brakes are optional, therefore may not be
present on all vehicles.
SYSTEM DESCRIPTION
NOTICE: To ensure correct braking performance, all
periodic maintenance, inspections and procedures
must be performed as indicated in the Scheduled
Maintenance section.
The brake system must be bled whenever any part
of the brake system has been replaced.
A hydraulic system is used to actuate the front brakes.
The system transmits the power needed to activate the
friction surfaces (pads) of the braking system from the
pedal to each disc brake hubs at each wheel.
The front hydraulic brake system is designed to operate
only after significant rear brake pressure has been
applied. This occurs by activation of the master cylinder,
after the brake pedal has reached the park brake latch
position. The lower actuator pivot is connected to the
brake pedal by a linkage rod which rotates to contact the
upper actuator pivot. The upper actuator pivot is con-
nected to a clevis on the master cylinder plunger. Move-
ment of the plunger hydraulically activates the caliper
pistons, forcing the brake pads against the rotors. With
653045
FRONT HYDRAULIC BRAKE
21
2
28
20
4
19
Figure 1 Master Cylinder Replacement
Repair and Service Manual
FRONT HYDRAULIC BRAKES
18
3
9
the brake pedal released, the upper actuator pivot and
the plunger returns to the 'at rest' position. With the mas-
ter cylinder no longer applying hydraulic pressure to the
brake pistons, the piston seals retract the pistons permit-
ting the brake pads to float freely against their guide pins
while removing all pressure against the rotors.
MASTER CYLINDER REPLACEMENT
When this procedure is performed,
it is likely that brake fluid will leak
from the master cylinder. Do not
allow brake fluid to contact painted body panels. If it
occurs, wipe off immediately.
NOTICE: Removing the front shield may improve
accessibility to brake components. (See BODY sec-
tion).
Remove Master Cylinder
Remove the master cylinder cover (7) after removing the
bolt (8) (Figure 1).
Remove the cotter pin (25) from clevis pin (16) securing
the upper actuator pivot (9) and master cylinder clevis
(28).
Remove the braided brake line (not shown in illustration)
16
17
25
8
8
Front of Vehicle
7
B
63
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