Isuzu Trooper (2000 year). Manual - part 174

5C–44 POWER ASSISTED BRAKE SYSTEM

Rear Disc Brake Pads

Brake Pads Inspection

Check the outer pads by looking at each caliper from
above. Check the thickness on the inner pad by looking
down through the inspection hole in the top of the caliper.
Whenever the pad is worn to about the thickness of the
pad base, the pad should be removed for further
measurements. The pad should be replaced anytime the
pad thickness (1) is worn to within 1.0 mm (0.039 in) of the
pad itself.
The disc pads have a wear indicator that makes a noise
when the pad wears to where replacement is required.

Minimum limit (1): 1.0 mm (0.039 in)

302RW016

Brake Pads and Associated Parts

306RW001

Legend

(1) Caliper Assembly
(2) Clip

(3) Lock Bolt
(4) Pad Assembly

5C–45

POWER ASSISTED BRAKE SYSTEM

Removal

NOTE: If a squealing noise occurs from the rear brake
while driving, check the pad wear indicator plate. If the
indicator plate contacts the rotor, the disc pad assembly
should be replaced.

D

Draw out two–thirds of the brake fluid from the
reservoir.

D

Raise the vehicle and support it with suitable safety
stands.

1. Remove wheel and tire assembly, refer to “Wheels

and Tires System” in Section 3E.

2. Remove lock bolt (1)

306RW002

3. Remove caliper assembly and support the caliper

assembly so that the brake hose is not stretched or
damaged.

4. Remove pad assembly with shim.
5. Remove clip.

Installation

1. Install clip (2).

306RW003

2. Install pad assembly with shim and apply special

grease (approximately 0.2 g) to both contacting
surfaces of the inner shims. Wipe off extruded grease
after installing.

306RW004

Legend

(3) Inner Shim
(4) Wear Indicator

5C–46 POWER ASSISTED BRAKE SYSTEM

306RW005

3. Install caliper assembly, use adjustable pliers to

bottom the piston into the caliper bore. Be careful not
to damage the piston dust boot and do not damage
the flexible hose by twisting or pulling it.

302RS008

4. Install lock bolt (5) and tighten the bolt to the specified

torque.

Torque: 44 N·m (32 lb ft)

5. Install wheel and tire assembly, refer to “Wheels and

Tires System” in Section 3E.

6. Pump the brake pedal several times to make sure that

the pedal is firm.  Check the brake fluid level in the
reservoir after pumping the brakes.

306RW006

5C–47

POWER ASSISTED BRAKE SYSTEM

Rear Disc Brake Rotor

Inspection

In the manufacturing of the brake rotor, all the tolerances
regarding surface finish, parallelism and lateral runout are
held very closely. Maintaining these tolerances provides
the surface necessary to assure smooth brake operation.

Lateral Runout

Lateral runout is the movement of the rotor from side to
side as it rotates on the spindle. This could also be
referred to as “rotor wobble”.
This movement causes the piston to be knocked back into
its bore. This results in additional pedal travel and a
vibration during braking.

Checking Lateral Runout

1. Adjust the wheel bearing correctly, refer to

“Differential” in Section 4A.

2. Attach a dial indicator to some portion of the

suspension so that the stem contacts the rotor face
about 29 mm (1.14 in) from the rotor edge.

3. Move the rotor one complete rotation.

1. The lateral runout should not exceed 0.13 mm

(0.005 in)

Maximum runout: 0.13 mm (0.005 in)

411RS019

Parallelism

Parallelism is the measurement of thickness of the rotor
at four or more points around the circumference of the
rotor. All measurements must be made 22 mm (0.87 in)
from the edge of the rotor.

The rotor thickness must not vary more than 0.010 mm
(0.0004 in) from point to point.

Maximum parallelism: 0.001 mm (0.0004 in)

420RS013

Replacing Brake Rotors

When installing new brake rotors, do not refinish the
surfaces. These parts are at the correct level of surface
finish.

Refinishing Brake Rotors

Accurate control of the rotor tolerances is necessary for
proper performance of the disc brakes. Machining of the
rotor should be done only with precision equipment. All
brake rotors have a minimum thickness dimension cast
into them.  This dimension is the minimum wear
dimension and not a refinish dimension.  The minimum
wear dimension is 16.6 mm (0.654 in). The minimum
refinish dimension is 16.97 mm (0.668 in).
When refinishing rotors, always use sharp cutting tools or
bits. Dull or worn tools leave a poor surface finish which
will affect initial braking performance. Vibration
dampening attachments should always be used when
refinishing braking surfaces. These attachments
eliminate tool chatter and will result in better surface
finish.