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