Isuzu N-Series. Service manual — part 217
HYDRAULIC BRAKES 5A-27
11. Piston Seal
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Pad
Use a vernier caliper to measure the pad thickness.
If the measured value is less than the specified limit, the
pads must be replaced with the repair pad kit.
Piston and Cylinder CIearance
1. Use a micrometer to measure the piston diameter.
2. Use an inside dial indicator to measure the cylinder
bore.
3. Calculate the piston and cylinder clearance.
If the clearance exceeds the specified limit, the piston
and/or the body assembly must be replaced along with
the repair seal kit.
Lateral Runout
1. Adjust the wheel bearing correctly.
Refer to Section 4C FRONT AXLE.
2. Attach a dial indicator to some portion of the sus-
pension so that the stem contacts the disc face
about 29 mm (1.14 in) from the disc edge.
Pad Thickness
mm (in)
Standard
Limit
14 (0.551)
1 (0.039)
N5A0067E
N0A0069E
Piston and cylinder Clearance
mm (in)
Standard
Limit
0.08 — 0.18
(0.0031 — 0.0071)
0.23 (0.0091)
N0A0070E
N5A0071E
5A-28 HYDRAULIC BRAKES
3. Move the disc one complete rotation.
The lateral runout should not exceed 0.13 mm
(0.005 in).
Parallelism and thickness
Parallelism is the measurement of the thickness of the
disc at four or more points around the circumference of
the disc. All measurement must be made at 29 mm (1.14
in) from the edge of the disc.
The disc thickness must not vary more than 0.010 mm
(0.0004 in) from the point to point.
Installation
1. Piston Seal
1) Apply rubber grease to the piston seal.
The rubber grease is included in the seal kit.
2) Install the piston seal to the cylinder bore
groove.
2. Piston
3. Piston Boot
4. Boot Ring
1) Apply brake oil to the piston outer circumfer-
ence.
2) Use a hand vise to install the pistons to the cyl-
inder.
3) Apply special grease to the piston.
This will prevent cylinder and piston corrosion.
4) Install the piston boot outer lip to the cylinder
bore groove.
Install the piston boot inner lip to the piston
groove.
Handle the piston boot carefully.
Maximum runout mm (in)
0.13 (0.005)
Maximum parallelism mm (in)
0.02 (0.0008)
Disc Thickness
mm (in)
Standard
Limit
35.0 (1.378)
32.0 (1.260)
N5A0072E
Legend
1. Piston Seal
2. Body Assembly
1
2
N5A0433E
N5A0075E
HYDRAULIC BRAKES 5A-29
5) Install the boot ring to the cylinder bore groove.
The boot ring must be completely installed to
the groove.
5. Support Assembly
Tighten:
Support assembly bolt to 226 N
⋅m (23.0 kg⋅m / 116 lb⋅ft)
6. Pad CIip
7. Pad
8. Caliper Assembly
9. Guide Pin Bolt
10. Lock Pin Bolt
Tighten:
Guide pin and lock pin bolt to 137 N
⋅m (14.0 kg⋅m / 101
lb
⋅ft)
11. Joint Bolt and Flexible Hose
Tighten:
Joint bolt to 34 N
⋅m (3.5 kg⋅m / 25 lb⋅ft)
N5A0076E
5A-30 HYDRAULIC BRAKES
Front Drum Brake Assembly (Two Leading and Dual Two Leading)
Two Leading Type (2L 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
N5A0126E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст