Brake drum ISUZU AXIOM 2002 Service Owner's Manual

5C±114
POWER±ASSISTED BRAKE SYSTEM
8. Install adjuster assembly (12).
9. Install hold-down pin (15) and hold-down spring and
cups (4).
10. Install lower return spring (5).

Use brake spring tool.
11. Install auto adjuster lever (10).
12. Install upper (outer) return spring (6).

Use brake spring tool.
13. Install brake drum (2).

Adjust the brakes, refer to the
Drum Brake
Adjustment
in this section.
14. Install wheel and tire assembly (1).

Refer to
Wheels and Tires in wheel and Tire System
section.
Drum Brake Adjustment (4y2 Model)
NOTE: All brakes are self-adjusting. Brakes are adjusted
by repeated stepping on the brake pedal. (After stepping
on the pedal and releasing it, the rear auto adjuster, in the
rear brake, produces a clicking sound.
The same operation should be repeated until the sound
disappears.)
Take the following steps after overhauling the rear brake
assembly.
1. Move the parking brake handle to its fully released
position.
2. Parking cable must be loosened sufficiently. (Loosen
the adjust nut and the lock nut.)
3. Repeat stepping on the brake pedal firmly, and
releasing it until the clicking sound can no longer be
heard.
If the difference between the brake drum inside
diameter and diameter of the brake shoes is adjusted
to be 0,5 mm, the number of times for depressing the
brake pedal can be reduced.
4. Remove the drum. Measure the brake drum inside
diameter and diameter of the brake shoes.
Shoe clearance: 0.25-0.4 mm (0.0098-0.0157 in)
If incorrect, check the brake auto-adjusting system.
5. Rotate the adjust nut until all slack disappears from
the cable. Set the adjust nut.
6. Applying about 30 kg (66 lb) of force, pull the parking
brake handle to its fully set position three or four
times.
7. If the parking brake is properly adjusted, the travel
between the fully disengaged position and the fully
engaged position will be between 9 and 11 notches.
If the traveling range is not within these limits, again
repeat steps 1 through 5.
After adjusting has been done, check to see if the rear
wheel rotates smoothly without drag when turned by
hand.
Servicing The Brake Drum
Whenever the brake drums are removed, they should be
thoroughly cleaned and inspected for cracks, scores,
deep grooves and out-of-round.
Cracked, Scored or Grooved Drum
A cracked drum is unsafe and must be replaced.
Do not attempt to weld a cracked drum.
Smooth any slight scores. Heavy or extensive scoring will
cause excessive brake lining wear, and it will probably be
necessary to machine the drum braking surface.
If the brake linings are slightly worn and the drum is
grooved, the drum should be polished with fine emery
cloth but should not be machined. At this stage,
eliminating all the grooves in the drum and smoothing the
ridges on the lining would require the removal of too much
metal and lining. If left alone, the grooves and ridges
match and satisfactory service can be obtained. If brake
linings are to be replaced, a grooved drum should be
machined. Using a grooved drum with new linings will
create inefficient braking performance and cause the
linings to wear quicker.
Out-Of-Round Drum
An out-of-round drum makes accurate brake shoe
adjustment impossible and is likely to cause excessive
wear to other parts of the brake mechanism due to its
eccentric action. An out-of-round drum can also cause
severe and irregular tire tread wear as well as a pulsing
brake pedal. When the braking surface of a brake drum
exceeds the specification limit of 0.15 mm (0.006 in) in
out-of-round, the drum should be machined to true up the
braking surface. Out-of-round can be accurately
measured with an inside micrometer fitted with proper
extension rods. When measuring a drum for out-of-round
and wear, take measurements at the open and closed
edges of machines surfaces and at right angles to each
other.
Maximum out-of-round: 0.15 mm (0.006 in)
420RS034

5C±115 POWER±ASSISTED BRAKE SYSTEM
Machining The Drum
If a drum is to be machined, only enough metal should be
removed to obtain a true, smooth braking surface. If a
drum does not clean-up when machined to a maximum
diameter, it must be replaced. Removal of more metal willaffect dissipation of heat and may cause distortion of the
drum.
After refinishing, replace any drum that exceeds a
maximum inside diameter of 296.5 mm (11.673 in). Do
not use a brake drum that is not within the specification.
Maximum inside diameter: 296.5 mm (11.673 in)
Wheel Cylinder Assembly (4y2 Model)
Wheel Cylinder Assembly and Associated Parts
305RW003
Legend
(1) Brake Linings
(2) Wheel Cylinder(3) Bolts
(4) Brake Pipe
Removal
1. Remove brake linings (1).

Refer to
Brake Lining and Associated Parts in this
section.
2. Remove brake pipe (4).

Plug the opening in the line to prevent fluid loss and
contamination.
3. Remove bolts (3) and wheel cylinder (2).
Installation
1. Install wheel cylinder (2) and tighten bolts (3) to the
specified torque.
Torque: 10 N´m (8 lb ft)
2. Install brake pipe (4) and tighten the nut to the
specified torque.
Torque: 16 N´m (12 lb ft)
3. Install brake linings (1).

Refer to
Brake Lining Replacement in this section.

Bleed brake system. Refer to
Hydraulic Brake in
this section.

5C±118
POWER±ASSISTED BRAKE SYSTEM
Main Data and Specifications
General Specifications
Rear drum brake
TypeLeading-trailing, non-servo
Drum inside diameter295 mm (11.6 in)
Wheel cylinder diameter22.22 mm (7/8 in)
Torque Specifications
E05RW010

5D1±2
PARKING BRAKE SYSTEM (4x4 Model)
Operation
When pulled in the direction ªAº, the parking lever presses
the secondary shoe against the brake drum using the
lever/shoe joint ªBº as a fulcrum and pushes the strut in
the direction ªCº. The strut ,in turn, presses the primary
shoe against the brake drum. Counter force ªDº to the
primary shoe is transmitted again to the secondary shoe
through the fulcrum ªBº. The secondary shoe contacts the
drum thereby producing braking effect. Clearance which
may result from worn parking brake shoe lining can be
adjusted by turning the adjusting screw. Refer to
Parking
Brake Adjustment
in this Section.
A05RS002
Legend
(1) Direction ªAº
(2) Lever/Shoe Joint ªBº as a fulcrum
(3) Direction ªCº
(4) Counter Force ªDº
(5) Parking Lever
(6) Secondary Shoe
(7) Adjusting Screw Notch(8) Parking Cable Guide
(9) Primary Shoe
(10) Strut
(11) Shoe Expanding Direction
(12) Parking Brake Cable Guide
(13) Adjusting Hole Plug
(14) Adjusting Screw Notch

5D1±4
PARKING BRAKE SYSTEM (4x4 Model)
Parking Brake Rear Cable
Parking Brake Rear Cable and Associated Parts
311RY00004
Legend
(1) Rear Wheels
(2) Caliper Assembly
(3) Rotor (Drum)
(4) Holding Spring
(5) Upper Return Spring
(6) Lower Return Spring
(7) Shoe Assembly(8) Cable Fixing Bolt
(9) Bolt
(10) Bolt
(11) Bolt (Only Long Wheel Base Model)
(12) Nut
(13) Nut
(14) Retainer
(15) Rear Cable

5D1±5
PARKING BRAKE SYSTEM (4x4 Model)
Removal
1. Remove rear wheels (1).
2. Remove 2 bolts to remove the caliper assembly (2)
from the support bracket. Refer to
ªRear Disc Brakesº
in Power Assisted Brake System
section. Temporarily
hang the caliper with wire etc.
3. Remove rotor (drum) (3).
4. Remove holding spring (4), upper return spring (5)
and lower return spring (6).
5. Previously remove the rear cable from the parking
brake lever, then remove the brake shoe assembly
(7).
308RW004
Legend
(1) Parking Brake Lever
6. Remove cable fixing bolt (8) and bolt (9) (10) (11).
7. Remove nut (12).
8. Remove nut (13) and retainer (14).
9. Remove rear cable (15).
Installation
1. Apply grease (BESCO L±2 or equivalent) to the
connecting portion of the rear cable and equalizer.
Install rear cable (15).
2. Install retainer (14).

Tighten nut (13) to the specified torque.
Torque: 41N´m (30lb ft)
3. Tighten nut (12) to the specified torque.
Torque: 15N´m (11lb ft)
4. Tighten bolt (11) (10) (9) to the specified torque.
Torque: 6.5N´m (57lb in)

To adjust the parking brake, refer to
Parking Brake
Adjustment
in this section.
5. Tighten the cable fixing bolt (8) to the specified
Torque: 6.5N´m (57lb in)6. Install shoe assembly (7).
After installation of the shoe and cable assembly,
apply special grease (included in the repair kit) to the
following portions indicated in the figure.
308RS005
7. Install lower return spring (6) and upper return spring
(5).
The parking brake lever side (secondary side) return
spring must be installed on the outer side of the
primary side return spring.
308RS003
Legend
(1) Outer Side
(2) Parking Lever
8. Install holding spring (4).
9. Install rotor (drum) (3).
10. Install caliper assembly (2).
11. Install rear wheels (1).

5D1±6
PARKING BRAKE SYSTEM (4x4 Model)
Inspection and Repair
Parking Brake Lining Inspection
Check the shoe assemblies for wear by removing the
brake drum.
Replace the shoe assemblies if the lining thickness is less
than 1.0 mm (0.039 in).
Minimum limit: 1.0 m (0.039 in)
308RS004
Parking Brake Rotor (Drum) Inspection
Refer to ªRear Disc Brakesº in Power-Assisted Brake
System
section for inspection procedure of the rotor
(drum).
Parking Brake Adjustment
1. Prior to lever stroke adjustment, adjust rear brake
shoe/rotor (drum) gap. Perform this procedure with
loosening the adjust nut of the hand brake lever.
2. Remove the adjusting hole plug (rubber) and turn the
shoe adjusting screw downward with a small
screwdriver so that shoes will expand until they get
into close touch with the rotor. (Turn down the
adjusting screw notch by notch until the rotor does not
turn.)
3. Turn the adjusting screw in the opposite direction
(upward) until the rotor can be turned lightly. Standard
number of notches to turn upward: 7 or 8 notches
Turn the rotor and make sure that there is no brake
dragging.
4. After the rear brake shoe/rotor (drum) gap has been
adjusted, perform parking brake cable adjustment.
5. Turn the adjusting nut so that the parking brake lever
travels 6±8 notches when pulled up with a force of 30
kg (66 lb).
6. Make sure there is no brake dragging. Then tighten
the cable lock nut
Torque : 13 N´m (113 lb in)7. When poor braking effect possibly resulting from
insufficient break±in is felt, or just after replacement
of parking brake shoe, be sure to conduct break±in as
follows:
8. Forward 50 km/h (30 mph) y 400 m (About 30
seconds) with a lever pull force of 15 kg (33 lb).
9. Backward 10 km/h (6 mph) y 50 m (About 18
seconds) with a lever pull force of 15 kg (33 lb).
NOTE: Break±in procedures must be performed under
safe conditions and traffic rules.

If braking effect still remains poor after the above
break±in, wait for some time until parking brake shoe
cools down and repeat the procedures 8. and 9. noted
above.

On completion of break±in, inspect parking brake
lever stroke, and if the lever does not come within the
specified number of notches when pulled up,
readjust.

Excessive break±in may cause premature wear of
the parking brake lining.

5D1±7
PARKING BRAKE SYSTEM (4x4 Model)
Main Data and Specifications
General Specifications
Model
TypeDuo±servo
Drum inside diameter210 mm(8.27 in)
Parking brake lever stroke6±8 notches
When pulled with a force of 30 kg (66 lb)
Torque Specifications
311R200002

PARKING BRAKE SYSTEM (4X2 Model)
5D2±3
Parking Brake Rear Cable
Parking Brake Rear Cable and Associated Parts
311RY00006
Legend
(1) Rear Wheels
(2) Drums
(3) Clip and Bolt
(4) Clip and Bolt(5) Clip and Bolt (Only Long Wheel Base Model)
(6) Nut
(7) Nut
(8) Retainer
(9) Rear Cable

5D2±4
PARKING BRAKE SYSTEM (4X2 Model)
Removal
1. Remove rear wheels (1) and drums (2).
2. Remove bolt (3) (4) (5).
3. Remove nut (6).
4. Remove nut (7) and retainer (8).
5. Remove rear brake shoe assemblies. Refer to
ªBrake
Lining Assembly and Associated Partsº in Power
Assisted Brake System
section.
6. Use offset box wrench (13 mm hex.) to compress the
locking lugs on the cable, then remove the rear cable
(9) from the Backing plate.
311RS012
Legend
(1) Offset Box Wrench
Installation
1. Install rear cable (9).
2. Install retainer (8).
3. Tighten nut (7) to the specified torque.
Torque : 41 N´m (30 lb ft)

To adjust the parking brake, refer to
Parking Brake
Adjustment
in this section.
4. Tighten nut (6) to the specified torque.
Torque : 15 N´m (11 lb ft)
5. Tighten bolt (5) (4) (3) to the specified torque.
Torque : 6.5 N´m (57 lb in)
6. Install rear drums (2) and wheels (1).
Parking Brake Adjustment
NOTE: All brakes are self adjusting. Brakes are adjusted
by repeated stepping on the brake pedal. (After stepping
on the pedal and releasing it, the rear auto±adjuster, in the
rear brake, produces a clicking sound. The same
operation should be repeated until the sound
disappears.)
Take the following steps after overhauling the rear brake
assembly.
1. Move the parking brake lever to its fully released
position.
2. Parking cable must be loosened sufficiently. (Loosen
the adjust nut and the lock nut.).
3. Repeat stepping on the brake pedal firmly, and
releasing it until the clicking sound can no longer be
heard.
If the difference between the brake drum inside
diameter and diameter of the brake shoes is adjusted
to be 0.5 mm, the number of times for depressing the
brake pedal can be reduced.
4. Remove the drum. Measure the brake drum inside
diameter and diameter of the brake shoes.
Shoe clearance: 0.25 mm to 0.40 mm
(0.0098 in to 0.0157 in)
If incorrect, check the brake auto±adjusting system.
5. Rotate the adjust nut of hand brake lever until all slack
disappears from the cable. Set the adjust nut.
6. Applying about 30 kg (66 lb) of force, pull the parking
brake lever to its fully set position three or four times.
7. If the parking brake is properly adjusted, the travel
between the fully disengaged position and the fully
engaged position will be 6 notches.
If the traveling range is not within these limits, repeat
steps 1 through 5 again .
After adjusting has been done, check to see if the rear
wheel rotates smoothly without drag when turned by
hand.