Handbrake Shoes (Rear Disc Brake Models) - Renewal; Anti-Lock Braking System (Abs) - General Information - Opel Kadett Owner's Manual

9•16 Braking system
Refitting
7 Commence refitting by
handbrake lever in place. Tighten the bolts to
the specified torque.
8 Secure the carpet with glue and/or sticky
tape. (The cut area will be covered by the
console.)
9 Refit and secure the console, and its
switches when applicable.
10 Refit and secure the front seat.
11 Refit the rubber boot and yoke. Adjust the
handbrake, as described in Section 22.
20 Handbrake shoes (rear disc
brake models) - renewal
Warning: Note that the dust
created by wear of the shoes
may contain asbestos, which is
a health hazard. Never blow it
out with compressed air and don't inhale
any of it. An approved filtering mask
should be worn when working on the
brakes. DO NOT use petroleum-based
solvents to clean brake parts. Use brake
cleaner or methylated spirit only.
1 Remove the rear brake disc (Section 8).
2 Disconnect the handbrake cable and the
return spring from the backplate (see
illustration).
3 Remove the steady washers and springs by
depressing the washers and turning them
through 90°. Remove the rear steady pin. The
front pin is captive on the backplate (see
illustrations).
4 Remove the shoes complete with springs,
adjuster and expander mechanism (see
illustration). Unhook the
separate the components.
5 Clean the components and renew worn or
damaged items. Apply
melting-point grease or anti-seize compound
to the adjuster threads, then screw the
adjuster in so that it is as short as possible.
6 Apply a smear of anti-seize compound to
the shoe rubbing areas on the brake
backplate (see illustration).
7 Assemble the shoes,
expander. Hook the springs into the holes in
the shoes (see illustration).
20.4 Removing the handbrake shoe
assembly
bolting the
20.2 Handbrake cable and spring
attachment (arrowed) on brake backplate -
8 Offer the shoes to the backplate, fitting the
leading shoe over the captive steady pin. Fit
the other steady pin and the steady springs
and washers.
9 Reconnect the handbrake cable and the
return spring.
10 Refit the brake disc as described in
Section 8.
11 Adjust the handbrake as described in
Chapter 1.
21 Anti-lock braking system (ABS)
- general information
The anti-lock braking system (ABS) is
available as an option on most models from
1989. The system monitors the rotational
speed of each wheel and prevents lock-up
during braking by reducing the hydraulic
pressure to any wheel cylinder or caliper
where lock-up is occurring. This is particularly
valuable when braking on loose or slippery
surfaces, or during emergency braking when
springs and
steering corrections may also be taking place.
However the system will not protect against
skids caused by excessively fast cornering or
a little high
heavy acceleration on poor surfaces.
The main components of the system are
shown in illustration 21.2. Magnetic pulses are
induced in the wheel speed sensors by a
toothed disc which is part of the brake disc or
drum. The pulses are monitored by the
electronic control unit (ECU). The ECU alters
adjuster and
the hydraulic pressure when necessary by
means of solenoid valves located in the
hydraulic unit. An electric pump in the hydraulic
20.6 Anti-seize compound applied to
rear disc brake models
rubbing points (arrowed)
20.3a Removing a steady washer . . .
20.3b . . . and the rear steady pin
unit generates the hydraulic pressure, which is
higher than that which would be produced by
the master cylinder alone.
In use, the onset of the anti-lock function is
indicated to the driver by a pulsating of the
brake pedal. Any malfunction in the system is
indicated by a warning light on the instrument
panel. When the system is working correctly,
the warning light will illuminate for a few
seconds when the ignition is switched on, but
will then go out and remain out. If it comes on
during driving, there is a fault. Normal braking
is not affected by malfunction of the ABS.
The ECU is mounted under the facia on the
left-hand side. It is protected against voltage
surges by a surge arrester relay and fuse
mounted together under the bonnet. The ECU
has its own fault diagnosis program, but this
is only accessible to Vauxhall dealers or other
specialists with the necessary test equipment.
No routine maintenance of the ABS
20.7 Handbrake shoe assembly ready for
refitting