Isuzu N-Series. Manual — part 205
SERVICE INFORMATION 00-37
Rear Brakes (NPR / NQR / NPS)
BR
AKE
C
O
N
T
R
O
L
A
B
S
34
—
—
❍
❍
❍
❍
—
—
—
—
—
—
—
H
B
B
33
❍
❍
❍
❍
❍
❍
—
—
❍
❍
—
❍
❍
E
X
H
A
U
S
T
B
R
A
K
E
32
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
L
S
P
V
31
—
—
❍
❍
❍
❍
❍
—
—
—
—
—
—
D
S
P
V
30
MA
ST
ER
C
Y
L.
In
side dia.
(in)
1
+
3
/
8
29
❍
❍
❍
❍
❍
❍
—
—
❍
❍
—
❍
❍
1
+
1
/
4
28
—
—
—
—
—
—
❍
❍
—
—
❍
—
—
1
+
1
/
8
27
—
—
—
—
—
—
—
—
—
—
—
—
—
1
+
1
/
16
26
9
+
10
T
25
—
—
—
—
—
—
❍
❍
—
—
❍
—
—
8
+
9
T
24
—
—
—
—
—
—
—
—
—
—
—
—
—
PA
R
K
IN
G
BR
A
K
E
LI
NING
Wi
dt
h
(m
m)
5
0
23
❍
❍
❍
—
❍
—
—
—
❍
❍
—
❍
❍
4
5
22
—
—
—
❍
—
❍
❍
❍
—
—
❍
—
—
DRU
M.
In
side
dia.
(in)
2
0
3
21
❍
❍
❍
—
❍
—
—
—
❍
❍
—
❍
❍
1
9
0
20
—
—
—
❍
—
❍
❍
❍
—
—
❍
—
—
R
E
AR
BR
AKE
DRUM
B
R
A
K
E
LINING
Wi
d
th
(mm
)
1
5
0
19
—
—
—
—
—
—
—
—
—
—
—
—
—
1
2
0
18
❍
❍
❍
❍
❍
❍
—
—
❍
❍
—
❍
❍
1
0
0
17
—
—
—
—
—
—
❍
❍
—
—
❍
—
—
9
0
16
—
—
—
—
—
—
—
—
—
—
—
—
—
7
5
15
—
—
—
—
—
—
—
—
—
—
—
—
—
6
0
14
DRUM
.
In
side dia.
(in)
3
7
0
13
—
—
—
—
—
—
—
—
—
—
—
—
—
3
2
0
12
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
❍
3
0
0
11
2
7
9
10
2
6
0
9
—
—
—
—
—
—
—
—
—
—
—
—
—
2
2
8
8
W
H
EE
L CY
L.
In
side dia.
(i
n
)
1
+
3
/
8
7
❍
❍
—
—
—
—
—
—
❍
❍
—
❍
❍
1
+
5
/
16
6
—
—
❍
❍
❍
❍
❍
—
—
—
—
—
—
1
+
3
/
16
5
—
—
—
—
—
—
—
❍
—
—
❍
—
—
1
4
—
—
—
—
—
—
—
—
—
—
—
—
—
7
/
8
3
Ty
p
e
D
2
L
W
A
U
T
O
2
—
—
❍
❍
❍
❍
—
—
—
—
—
—
—
D
2
L
W/O
A
U
T
O
1
❍
❍
—
—
—
—
❍
❍
❍
❍
❍
❍
❍
Mo
de
ls
NQR7
0R
L
-5
LYXJT
NQR7
0R
L
-5
N
XYRJ
NQ
R7
5T
L-
5
LXYEJ
NQ
R7
5T
L-
5
LXYEJ
2
NQR7
5T
L-
5
K
WYE
J
NQR7
5T
L-
5
K
WYE
J2
N
P
S
71L
L-
5JX
Y
NPR7
1
LU-
5
LXYPJ
NQ
R7
0L
U
-5
NXYPJ
NQ
R7
5L
U
-5
NXYPJ
NPR7
1
P
U
-5
L
XY
PJ
NQ
R7
0RU-
5N
XYPJ
NQ
R7
5RU-
5N
XYPJ
Not
ava
ilable
S
tandard
F
a
ct
ory opt
ion
Non
—
❍
❏
No
.
12
1
12
2
12
3
12
4
12
5
12
6
12
7
12
8
12
9
13
0
13
1
13
2
13
3
(
(
(
(
00-38 SERVICE INFORMATION
SERVICE STANDARD
ITEMS
SERVICE STANDARD
SERVICE LIMIT
FRONT DISC BRAKE ASSEMBLY
Pad Thickness (
φ 265 mm)
mm (in)
14.0 (0.551)
1.0 (0.039)
Pad Thickness (
φ 293 & φ 310 mm)
mm (in)
13.0 (0.510)
1.0 (0.039)
Piston and Cylinder Clearance
mm (in)
0.08 — 0.18
(0.0031 — 0.0071)
0.23 (0.0091)
Disc Lateral Run out
mm (in)
0.13 (0.005) or less
—
Disc Maximum Parallelism
mm (in)
0.02 (0.0008)
—
Disc Thickness (
φ 265 mm)
mm (in)
35.0 (1.378)
28.5 (1.122)
Disc Thickness (
φ 293 mm)
mm (in)
40.0 (1.575)
37.0 (1.457)
Disc Thickness (
φ 310 mm)
mm (in)
42.0 (1.654)
39.0 (1.535)
FRONT DRUM BRAKE ASSEMBLY
Brake Drum Inside Diameter
mm (in)
279.4 (11.00)
300.0 (11.81)
320.0 (12.60)
281.0 (11.06)
301.5 (11.87)
321.5 (12.66)
Brake Drum Run-out
mm (in)
0.13 (0.005) or less
—
Brake Lining Thickness or Rivet Depth
mm (in)
—
1.0 (0.039)
Wheel Cylinder and Piston Clearance
mm (in)
—
0.15 (0.006)
REAR DRUM BRAKE ASSEMBLY
Brake Drum Inside Diameter
mm (in)
228.6 (9.00)
240.0 (9.45)
260.0 (10.24)
279.4 (11.0)
290.0 (11.42)
300.0 (11.81)
320.0 (12.60)
370.0 (14.57)
230.0 (9.06)
241.5 (9.51)
261.5 (10.30)
281.0 (11.06)
291.5 (11.48)
301.5 (11.87)
321.5 (12.66)
372.0 (14.64)
Brake Drum Run-out
mm (in)
0.13 (0.005) or less
—
Brake Lining Thickness or Rivet Depth
mm (in)
—
1.0 (0.039)
Wheel Cylinder and Piston Clearance
mm (in)
—
0.15 (0.006)
BRAKE PEDAL AND CONTROL
Master Cylinder and Piston Clearance
mm (in)
0.11 — 0.195
(0.004 — 0.008)
0.22 (0.009)
PARKING BRAKE
Brake Drum Inside Diameter
mm (in)
178.0 (7.01)
190.0 (7.48)
203.2 (8.00)
179.0 (7.05)
191.0 (7.52)
205.0 (8.07)
Brake Drum Run-out
mm (in)
0.05 (0.002) or less
—
Brake Lining Thickness
mm (in)
—
1.0 (0.039)
EXHAUST BRAKE
Butterfly Valve and Body Clearance
(4HF1 Engine)
mm (in)
0.4 — 0.6 (0.016 — 0.024)
—
(Other Engine)
mm (in)
0.1 — 0.2 (0.004 — 0.008)
—
SERVICE INFORMATION 00-39
SERVICING
Service Brakes
Wheel Brake Adjustment
Brake Lining Clearance Adjustment (2L and D2L)
Without auto-adjuster type
1. Chock the wheels not being adjusted.
2. Jack up the axle until the wheels can be turned
freely.
3. Manually shake the wheel to check for excessive
play.
4. Remove the grommet fitted to one of the brake
drum cover adjuster holes.
5. Insert a screwdriver into the adjuster hole.
Manually rotate the wheel while turning the adjust-
er (A) in the direction of the arrow (1) until resis-
tance is felt at the wheel.
6. Back off the adjuster (A) in the direction of the ar-
row (2) the specified number of notches.
2L
D2L
7. Install the grommet to the adjuster hole.
8. Repeat Steps 4 through 7 on the other wheels.
9. Lower the vehicle to the ground.
With auto-adjuster type
1. Measure the internal diameter of the brake drum.
• Take measurement of the distance at (A), (B)
and (C) points.
2. Measure the external diameter of the brake shoe.
• Take measurement of the distance at (A), (B)
and (C) points.
Specified Notches
Front
Rear
5-6
N5A0001E
N5A0002E
N5A0003E
00-40 SERVICE INFORMATION
3. Turn the adjuster gear so that the difference be-
tween the internal diameter of the brake drum and
the external diameter of the brake shoe becomes
0.6 mm (0.024 in).
4. Step on the brake hard while turning the brake
drum in the forward direction, or while driving for-
ward.
Brake Pedal Adjustment
Brake Pedal Height and Free Play Adjustment
Vacuum Booster (Master Vac) Type:
The height of push rod should be adjusted so that the
distance from its master cylinder mounting surface to
end measures 18.2 mm (0.717 in).
For push rod length adjustment, the distance from the
center of crevis pin hole to brake pedal bracket mount-
ing surface should be set at 109 mm (4.291 in); without
spacer, 129 mm (5.079 in); with spacer.
When fixed under this condition, there is no need to ad-
just the height of brake pedal from floor and free play.
Notice:
• As vacuum booster (Master Vac) is undetachable
type, it should be replaced as an assembly if it
does not work well.
• Be sure to adjust the stop light switch.
Brake Pedal Free Play and Allowance
Standard value
1. Free play: 4 to 7 mm (0.16 to 0.28 in)
24 to 29 mm (0.94 to 1.14 in) for HBB type
(When depressed with force of the 490 N (50 kg / 110
lbs).)
(When depressed with force of the 294 N (30 kg / 66
lbs).)
N5A0004E
N5A0005E
2. Allowance
mm (in)
NHR
Front Drum Brake
50 (1.97)
NKR
Front Disc Brake Model
40 (1.57)
Front
Drum
Brake
Model
Less than
GVM 6.5 ton
60 (2.36)
GVM 6.5 ton
40 (1.57)
NPR
NQR
Front Disc Brake Model
40 (1.57)
Front
Drum
Brake
Model
Less than
GVM 6.5 ton
60 (2.36)
GVM 6.5 ton
or more
40 (1.57)
NPS
Front Drum Brake
40 (1.57)
NPR, NQR
(HBB type)
Front Disc Brake Model
35 (1.38)
Front Drum Brake Model
45 (1.77)
N5A0006E
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