Isuzu N-Series. Manual — part 207
SERVICE INFORMATION 00-45
the work, first turn the engine off, wait 30 minutes,
and verify that the temperature has cooled off.
4. Even when a long time passes after the engine is
turned off, the high-pressure hydraulic oil in the ac-
cumulator of the hydro boost remains stored under
pressure.
Before removing the hydro boost assembly or pip-
ing, be sure to repeatedly press the brake pedal at
least ten times with the engine off, and make sure
the pressure of the hydraulic oil in the accumulator
has been reduced to atmospheric pressure before
doing the work.
In particular, when removing the replacement-part
accumulator from the hydro boost assembly, the
hydraulic oil may spatter if it remains stored under
high pressure inside the accumulator, so be careful
of this.
Parking Brake
Parking Brake Adjustment
Before beginning to adjust the parking brake, park the
vehicle on a level surface, chock all of the wheels, and
place the parking brake lever in the released (off) posi-
tion.
Then loosen the parking brake control wire lock nut (1),
and turn the adjuster (2) to completely loosen the park-
ing brake control wire.
Parking Brake Lining Clearance Adjustment
1. Jack up the rear axle until the wheels can be turned
freely.
2. Remove one of the two check hole covers from the
parking brake drum.
3. Rotate the brake drum to align the check hole with
the adjusting screw.
4. Move the camshaft lever from side to side several
times to center the brake shoes.
5. Insert a screwdriver into the check hole and rotate
the adjusting screw by pushing it upward.
Continue doing this until the brake shoes begin to
drag on the drum.
N5A0020E
N5A0024E
N5A0021E
00-46 SERVICE INFORMATION
6. Back off the adjusting screw the specified number
of notches.
7. Reinstall the check hole cover.
8. Lower the rear wheels to the floor.
Parking Brake Lever Travel Adjustment
1. Fully set the parking brake lever and release it sev-
eral times.
Leave the parking brake lever in the released posi-
tion.
2. Loosen the parking brake control wire lock nut (1).
3. Turn the adjuster (2) to adjust the lever travel to the
specified notches.
4. Retighten the control wire lock nut (1).
5. Check the parking brake lever travel (measured in
notches).
Adjusting Screw Notches and Clearance
Brake Type mm (in)
Notches
Clearance mm (in)
178 (7.008), 190
(7.480)
30
0.75 (0.029)
203.2 (8.000)
8
0.23 (0.009)
Legend
1. Screwdriver
2. Adjusting screw
3. Brake drum
4. Brake shoe
5. Clearance
6. Direction of brake shoe expansion (for 178
mm, 190 mm)
Brake Type (203 mm) is direction to the
counter rotation.
N5A0022E
N5A0023E
Parking brake lever travel at 147 N (15 kg / 33 lbs)
notches
6 to 8
N5A0024E
SERVICE INFORMATION 00-47
FIXING TORQUE
Front Wheel Brake (NHR / NKR / NPR / NQR)
N5A0026E
00-48 SERVICE INFORMATION
Front Wheel Brake (NPS)
N5A0027E
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