Isuzu N-Series. Manual — part 218
HYDRAULIC BRAKES 5A-31
Dual Two Leading Type (D2L Type)
Legend
1. Shoe holding spring, cup and pin
4. Wheel cylinder assembly
2. Brake shoe and return spring
5. Back plate and oil shield cover
3. Brake flexible hose and pipe
N5A0127E
5A-32 HYDRAULIC BRAKES
Removal
If the brake drum has step wear or the brake drum edge
is corroded, it will be difficult to remove the brake drum.
The following procedure will make brake drum removal
easier.
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.
3. Using
φ5 mm plus driver put it into the adjuster le-
ver release hole and then push up the adjuster le-
ver.
4. Put the slotted screwdriver into the adjuster hole
while push up the adjuster lever.
Legend
1. Corroded portion
Legend
1. Adjuster lever release hole cover
2. Adjust hole cover
N5A0128E
N5A0129E
Legend
1. Adjuster lever release hole
N5A0130E
N5A0131E
HYDRAULIC BRAKES 5A-33
5. Turn the adjuster gear to the marked arrow
“LOOSE” on the backing plate.
6. Shoe Holding Spring, Cup and Pin
7. Brake Shoe and Return Spring
8. Brake flexible Hose and Pipe
1) Place a tray beneath the flexible hose to re-
ceive the brake fluid.
2) Loosen the union nut (1).
3) Remove the clip (2) and loosen the hose end
(3) from the pipe to remove the flexible hose.
Notice:
Take care not to twist the piping and the flexible hose.
9. Wheel Cylinder Assembly
10. Back Plate and Oil Shield Cover
Store all of the removed parts in a clean part tray.
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
N5A0132E
N5A0133E
N5A0136E
N5A0137E
5A-34 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 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.
Brake Drum Inside Diameter
mm (in)
Drum size
Standard
Limit
279.4
300.0
320.0
279.4 (11.00)
300.0 (11.81)
320.0 (12.60)
281.0 (11.06)
301.5 (11.87)
321.5 (12.66)
Out of round:
• Limit: 0.13 mm (0.005 in)
Brake Lining Thickness or Rivet Depth
mm (in)
Limit
1.0 (0.039)
N5A0138E
N5A0139E
Legend
1. Adhesion type
2. Riveted type
N5A0140E
N5A0141E
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