Isuzu N-Series. Manual - part 252

PARKING BRAKES 5C-3

PARKING BRAKE ASSEMBLY, PARKING BRAKE LEVER

Components

Removal

1. Jack up the body, and support the frame with the

stand.
Refer to “LIFTING INSTRUCTION” in Section 0A
GENERAL INFORMATION.

2. Remove the rear propeller shaft.

• Disconnect the propeller shaft from the transmis-

sion.

• Remove the center bearing bracket as well in the

case of the long type.

3. Loosen the coupling driver lock nut.

• Apply the parking brake, completely raise the latch

of the lock nut for the coupling driver, and loosen
the lock nut. Then, release the parking brake.

4. Disconnect the parking brake cable.

• 203 mm TYPE

– Remove the lock nut from the lever of the park-

ing brake assembly.

Legend

1. Parking brake lever assembly

5. Parking brake assembly (203 mm TYPE)

2. Parking brake cable (203 mm TYPE)

6. Coupling driver

3. Parking brake cable (178, 190 mm TYPE)

7. Parking brake drum

4. Parking brake assembly (178, 190 mm TYPE)

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5C-4 PARKING BRAKES

– Remove the mounting bolt from the cable

bracket, and disconnect the parking brake ca-
ble from the transmission.

• 178, 190 mm TYPE

– Remove the parking brake drum.
– Disconnect the cable from the lever of the park-

ing brake assembly.

5. Remove the parking brake drum.

• Remove the adjusting hole cover and the parking

brake drum.

6. Remove the coupling driver.

• Remove the lock nut that was loosened in step 3,

and remove the coupling driver using a universal
puller.

7. Remove the parking brake assembly.
8. Remove the parking brake lever assembly.

• Loosen the adjusting nut, and disconnect the park-

ing brake cable from the lever.

• Disconnect the connector.

• Loosen the retaining nut, and remove the parking

brake lever assembly.

9. Inspect the parking brake drum.

• Inspect the parking brake drum for damage, wear,

step wear, or cracking. If any defect is found, cor-
rect or replace the parking brake drum with a new
one.

• Measure the inside diameter of the parking brake

drum.

Drum inside diameter
178 mm (7.00 in) type parking brake
Standard value = 178 mm (7.00 in), limit = 179 mm (7.05
in)
190 mm (7.48 in) type parking brake
Standard value = 190 mm (7.48 in), limit = 191 mm (7.52
in)
203 mm (7.99 in) type parking brake
Standard value = 203 mm (7.99 in), limit = 204 mm (8.03
in)

N5A0340E

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PARKING BRAKES 5C-5

Notice:
Correct the drum inside diameter by grinding to the ap-
propriate limit.

Installation

1. Mount the parking brake lever assembly.

• Mount the parking brake lever assembly, connect

the parking brake cable, and properly tighten the
adjusting nut.

2. Mount the parking brake assembly.

• 178 mm type parking brake

Tighten:
M12 nut to 113 N

⋅m (11.5 kg⋅m/83.3 lb⋅ft)

M8 bolt to 25 N

⋅m (2.6 kg⋅m/18.4 lb⋅ft)

• 190 mm type parking brake

– Wash the stud bolt and the bolt hole with vola-

tile oil (thinner, alcohol, etc.).

– Apply Loctite #638 to the embedded side

(guide side) of the stud bolt and the bolt hole.

– Attach the stud bolt (M12).

Tighten:
Stud bolt to 49 N

⋅m (5.0 kg⋅m/36.1 lb⋅ft)

– Mount the parking brake assembly, and fasten

it with the caulking nut (M12).

Tighten:
Caulking nut to 126.5 N

⋅m (12.9 kg⋅m/93.3 lb⋅ft)

• 203 mm type parking brake

Tighten:
127 N

⋅m (13.0 kg⋅m/93.7 lb⋅ft)

3. Connect the parking brake cable.

• Connect the parking brake cable to the lever of the

parking brake assembly (178, 190 mm TYPE).

Notice:
Confirm that the portion indicated by the arrow is prop-
erly connected.

4. Mount the coupling driver.

• Attach the coupling driver to the main shaft, and

fasten it with an O-ring, a conical washer (MSB
only), and a lock nut.
Tighten the lock nut while holding the coupling driv-
er with a handle 5-8840-2043-0.

Notice:

• Use a new lock nut because it is a caulking type.

Apply oil to the seating face before attaching the
lock nut.

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Tightening torque

N

⋅m (kg⋅m/lb⋅ft)

MSB type transmission

226 (23.0/166.7)

MYY type transmission

289 (29.5/213.2)

MZZ type transmission

382 (39.0/281.8)

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N5A0346E

5C-6 PARKING BRAKES

• Use a new O-ring. Apply a thin coat of lubricating

oil to the O-ring before attaching it.

• Attach the conical washer (MSB only) with the

identification groove facing the lock nut (rear side).

5. Caulk the lock nut.

• Align the lip of the lock nut with the V-grooves cut

in the tip of the main shaft, and securely caulk the
lock nut at two points so that the caulking length
will be 5 mm (0.2 in) or more and the clearance be-
tween the lower V-groove in the main shaft and the
lock nut lip will be 1.5 mm (0.06 in) or less.

Notice:
After the caulking of the lock nut, check the caulked
points for cracking. If there is any crack, replace the lock
nut with a new one, and caulk it.

6. Mount the parking brake drum.
7. Adjust the pulling allowance of the parking brake.

• Turn the adjuster until the parking brake drum

stops turning. (Turn the parking brake drum down-
ward in the case of vehicles with a 203 mm type or
upward in the case of vehicles other than 203 mm
type.)

• Turn back the adjuster by the specified number of

notches.

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