Isuzu N-Series. Manual — part 253
PARKING BRAKES 5C-7
Number of notches by which the adjuster must be
turned back
All vehicles equipped with other than 203 mm type
= 30 notches
Vehicles equipped with a 203 mm type = 8 notches
• Adjust the pulling allowance of the parking brake
lever by tightening the adjusting nut so that the al-
lowance at a handle operating force of 147 N (15.0
kg / 33 lb) will be six to eight notches.
• Confirm that the brake does not drag.
• Mount the adjusting cover over the parking brake
drum.
N5A0350E
5C-8 PARKING BRAKES
UNIT REPAIR [178 mm, 190 mm TYPE]
Parking Brake Assembly
Disassembly
1. Holding Spring
2. Return Spring
3. Adjuster Assembly
4. Spring; Adjuster
5. Secondary Brake Shoe Assembly
6. Primary Brake Shoe Assembly
7. Strut
8. Parking Cable
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Visual Check
Inspect the following parts for wear, corrosion, scuffs,
scratches, deterioration or other abnormal conditions.
• Brake drum
• Brake lining
• Return spring
• Parking brake lever assembly
• Parking brake inner cable
Brake Drum
Use a vernier caliper to measure the brake drum inside
diameter.
If the measured value exceeds the specified limit, the
brake drum must be replaced.
Legend
1. Holding spring
5. Secondary brake shoe assembly with lever
2. Return spring
6. Primary brake shoe assembly
3. Adjuster assembly
7. Strut
4. Spring; adjuster
8. Parking cable
N5A0353E
Brake Drum Inside Diameter
mm (in)
Standard
Limit
Inside diameter
178 (7.01)
190 (7.48)
179 (7.05)
191 (7.52)
Out of round:
• Limit: 0.05 mm (0.0020 in) or less
PARKING BRAKES 5C-9
Return Spring
Use a spring balancer to measure the return spring set
load.
If the variation exceeds 10% of the specified value, the
return spring must be replaced.
Brake Lining Thickness
Use a vernier caliper to measure the brake lining thick-
ness.
If the measured value is less than the specified limit, the
brake shoe assembly must be replaced.
Drum inside dia. mm (in)
178 (7.01)
190 (7.48)
Free length:
mm (in)
Primary
62 (2.44)
62.1 (2.44)
Secondary
49 (1.93)
Set length:
mm (in)
Primary
70 (2.76)
67.1 (2.64)
Secondary
57 (2.24)
Set load;
N (kg/lb)
Primary
105.9 —
129.5
(10.8 —
13.2/23.8
— 29.1)
53 — 65.7
(5.4 — 6.6/
11.9 —
14.6)
Secondary
88.3 —
107.8
(9.0 —
11.0/19.8
— 24.3)
N5A0138E
Legend
A. Length
Brake Lining Thickness
mm (in)
Limit
1.0 (0.039)
N5A0356E
N5A0357E
5C-10 PARKING BRAKES
Reassembly
1. Parking Cable Rear
2. Strut
3. Primary Brake Shoe Assembly
4. Secondary Brake Shoe Assembly
Install the brake shoes by fitting them properly into
slot in the adjuster and strut.
5. Spring; Adjuster
6. Adjuster Assembly
7. Return Spring
Drum inside diameter 178 mm only
Attach the return spring bauing fewer windings at the pri-
mary side as illustrated.
8. Holding Spring
Legend
1. Fewer windings
2. Much windings
N5A0358E
N5A0360E
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