Isuzu N-Series. Manual — part 220
HYDRAULIC BRAKES 5A-39
Drum Inside Diameter 260 mm
1. Remove the rubber covers from the brake lining
clearance adjusting hole and auto-adjuster lever
release hole.
2. Push up the auto-adjuster lever with a long drift or
a suitable rod.
(Outside diameter: 4 mm (0.15 in) length: 80 mm
(3.1 in))
3. Hold the auto-adjuster lever stationary.
Use a screwdriver to rotate adjusters at back of the
brake to provide clearance between lining and
drum.
Notice:
Be sure to push up the auto-adjuster lever (Step 2).
Failure to do so will result in damage to the teeth of the
auto-adjuster lever.
Take care not to damage the rubber boot with the bar or
the screwdriver.
Drum Inside Diameter 320 mm
1. Remove the rubber cover from the brake lining
clearance adjusting hole and auto-adjuster lever
release hole.
2. Remove the adjust hole cover and adjuster lever
release hole cover.
Legend
1. Corroded portion
Legend
1. Auto-adjuster lever
2. Rod
N5A0128E
N5A0155E
Legend
1. Adjuster
2. Screw driver
3. Rod
N5A0156E
N5A0129E
5A-40 HYDRAULIC BRAKES
3. Using
φ5 mm Phillips screwdriver put it into the ad-
juster lever release hole and then push up the ad-
juster lever.
4. Put the flathead screwdriver into the adjuster hole
while push up the adjuster lever.
5. Turn the adjuster gear to the marked arrow
“LOOSE” on the backing plate.
Drum Inside Diameter 240 mm
1. Remove the rubber cover from the brake lining
clearance adjusting hole/auto-adjuster lever re-
lease hole in the back plate.
2. Insert a thin, suitable rod in the hole, and push up
the auto-adjuster lever (4).
3. With the auto-adjuster lever (4) pushed up, insert a
keystone tip screwdriver in the adjusting hole, and
turn the adjuster gear (1) to increase the gap be-
tween the gear and the brake shoe (the outside di-
ameter of the shoe will decrease).
Legend
1. Adjuster lever release hole cover
2. Adjuster hole cover
Legend
1. Adjuster lever release hole
N5A0130E
N5A0131E
Legend
1. Adjuster gear
N5A0132E
N5A0133E
HYDRAULIC BRAKES 5A-41
Notice:
Do not fail to push up the auto-adjuster lever before turn-
ing the gear. Failure to do so will result in damage to the
teeth of the gear because it is locked with the lever.
Exercise care not to damage the boot of the wheel cyl-
inder and other parts when turning the gear and pushing
up the lever.
Drum Inside Diameter 290 mm
1. Remove the rubber cover from the brake lining
clearance adjusting hole/auto-adjuster lever re-
lease hole in the back plate.
2. Insert a thin, suitable rod in the auto-adjuster lever
release hole, and push the end of the auto-adjuster
lever (3) in the direction of the arrow (4).
3. With the auto-adjuster lever (3) pushed up, insert a
keystone tip screwdriver in the adjusting hole, and
turn the adjuster gear (6) to increase the gap be-
tween the gear and the brake shoe (the outside di-
ameter of the shoe will decrease).
Notice:
Do not fail to push up the auto-adjuster lever before turn-
ing the gear. Failure to do so will result in damage to the
teeth of the gear because it is locked with the lever.
Exercise care not to damage the boot of the wheel cyl-
inder and other parts when turning the gear and pushing
up the lever.
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Brake Drum Inside Diameter
Visually inspect the brake drum for excessive wear and
scoring.
If the brake drum is scored or worn, lathed to the speci-
fied limit.
Use a vernier caliper to measure the brake drum inside
diameter.
Legend
1. Adjuster gear
2. Brake shoe
3. Plug hole
4. Auto-adjuster lever
5. Loosening direction
N5A0165E
Legend
1. Plug hole
2. Rotating direction of tire (forward)
3. Auto-adjuster lever
4. Loosening direction
5. Plug hole
6. Adjuster gear
Brake Drum Inside Diameter
mm (in)
Drum size
Standard
Limit
228.6
228.6 (9.00)
230.0 (9.06)
240
240.0 (9.45)
241.5 (9.51)
260
260.0 (10.24)
261.5 (10.30)
279.4
279.4 (11.00)
281.0 (11.06)
290
290.0 (11.42)
291.5 (11.48)
300
300.0 (11.81)
301.5 (11.87)
320
320.0 (12.60)
321.5 (12.66)
Out of round
• Limit: 0.13 mm (0.005 in)
N5A0166E
5A-42 HYDRAULIC BRAKES
Brake Lining Thickness Measurement
Use a vernier caliper to measure the brake lining thick-
ness or the rivet depth.
If the measured value is less than the specified limit, the
brake shoe assembly and/or the lining must be re-
placed.
Brake Lining Removal (Riveted Type Only)
1. Remove the rivet caulking portions with a hammer
and chisel.
2. Remove the rivets with a hammer and punch.
3. Inspect the brake shoe for cracking.
Brake Lining Installation (Riveted Type Only)
1. Install the brake lining and the rivets to the brake
shoe.
2. Place the brake shoe assembly in the air hydraulic
riveter.
3. Use the air hydraulic riveter to set and caulk each
of the rivets.
4. Start riveting at the center of lining and work to-
wards the ends.
Brake Lining and Drum Contact
1. Apply chalk powder to the entire inside brake drum
surface.
2. Place the brake shoe assembly in the inside brake
drum.
3. Move the brake shoe assembly around the inside
brake drum.
Check for uniform contact between the brake lining
and the brake drum.
Brake Lining Thickness or Rivet Depth
mm (in)
Limit
1.0 (0.039)
Legend
1. Adhesion type
2. Riveted type
N5A0138E
N5A0139E
N5A0140E
N5A0141E
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