Isuzu N-Series. Service manual — part 227
HYDRAULIC BRAKES 5A-67
2) L.S.V adjustment
When the adjustment cannot be done with the
L.S.V spring shackle, loosen the L.S.V adjust
nut (2 pcs.) and adjust the oil pressure to the
standard value by sliding the L.S.V up and
down. After the L.S.V adjustment, readjust the
length of the L.S.V spring shackle.
Tighten:
L.S.V adjust nut to 13 N
⋅m (1.3 kg⋅m / 113 lb⋅in)
3. Unit Inspection of L.S.V
1) Loosen the L.S.V adjust nut (2 pcs.). And then
lift the L.S.V up fully and tighten it up tentatively
so that the L.S.V spring will not move.
2) Under the same conditions as 1) above, check
the rear wheel cylinder fluid pressure.
For (C) and (D), refer to the adjustment standard
table.
Legend
1. L.S.V spring shackle
2. Adjust nut
3. Lock nut
Legend
1. L.S.V adjust nut
2. L.S.V spring
3. L.S.V
N5A0226E
N5A0227E
Legend
1. L.S.V adjust nut
2. L.S.V spring
3. L.S.V
Standard
Master cylinder fluid
pressure
kPa (kg/cm
2
/psi)
Rear fluid pressure
kPa (kg/cm
2
/psi)
2942 (30 / 427)
(C)
7845 (80 / 1138)
(D)
N5A0228E
5A-68 HYDRAULIC BRAKES
Adjustment Standard Table
N5A0225E
Models
(A) N (kg/lb)
(B) kPa (kg/cm
2
/psi)
(C) kPa (kg/cm
2
/
psi)
(D) kPa (kg/cm
2
/
psi)
NHR55-1C
5884(600/1323)
3687
±588
(37.6
±6/535±85)
1442
±196
(14.7
±2/209±28)
1932
±343
(19.7
±3.5/280±50)
NHR55-3C
8826(900/1984)
NKR77-1D
12258(1250/2756)
NKR77-5D
11768(1200/2646)
NKR77-3E
6865(700/1543)
NKR77-5E
8826(900/1984)
NKR77-5H
8826(900/1984)
NKR55-1E
6865(700/1543)
NKR55-3E
6865(700/1543)
NKR55-5H
9807(1000/2205)
5031
±588
(51.3
±6/730±85)
1697
±196
(17.3
±2/246±28)
2922
±343
(29.8
±3.5/424±50)
NKR77-3EXY (Taiwan)
6865(700/1543)
3687
±588
(37.6
±6/535±85)
1442
±196
(14.7
±2/209±28)
1932
±343
(19.7
±3.5/280±50)
NKR77-3EXA (Taiwan)
7845(800/1764)
NKR77-5E (Taiwan)
9807(1000/2205)
NKR77-5H (Taiwan)
9807(1000/2205)
5031
±588
(51.3
±6/730±85)
1697
±196
(17.3
±2/246±28)
2922
±343
(29.8
±3.5/424±50)
NPR77-5D/5CW
11768(1200/2646)
3687
±588
(37.6
±6/535±85)
1442
±196
(14.7
±2/209±28)
1932
±343
(19.7
±3.5/280±50)
HYDRAULIC BRAKES 5A-69
Deceleration Sensing Proportioning Valve
DSPV Mounting Angle
Conduct the following inspections, and if any abnormality is found, replace.
NPR75-5E
8826(900/1984)
5031
±588
(51.3
±6/730±85)
1697
±196
(17.3
±2/246±28)
2922
±343
(29.8
±3.5/424±50)
NPR77-5H
8826(900/1984)
NPR70/75-5J/5HW
14710(1500/3307)
NPR75-5J/5HW
14710(1500/3307)
NPR70/75-5L/5KW
16671(1700/3748)
NQR75-5L/5KW
14710(1500/3307)
NQR75-5N (Australia)
12749(1300/2866)
NPR66-5J
8826(900/1984)
NPR66-5E
15691(1600/3527)
NPR66-5L (South
Africa)
12749(1300/2866)
NPR66-5L (GCC)
13729(1400/3086)
NPR71 / NQR70-5L
13729(1400/3086)
NQR71-5N
13729(1400/3086)
NQR75-5N (South
Africa)
14710(1500/3307)
NPS71/75-5J
17652(1800/3968)
Legend
1. Mounting angle
3. Ground surface
2. Mounting surface
4. Front
Models
Mounting Angle
NHR
12
°00′±45′
NKR
12
°30′±45′
Models
(A) N (kg/lb)
(B) kPa (kg/cm
2
/psi)
(C) kPa (kg/cm
2
/
psi)
(D) kPa (kg/cm
2
/
psi)
N5A0230E
5A-70 HYDRAULIC BRAKES
Condition
Procedure
Judgement
As installed in the vehi-
cle
Measure braking force to make sure of
normality.
If no braking force, adherence of ball
(deceleration sensing) to seal is sus-
pected.
Bleed air also from the DSPV side of
breather.
If no brake fluid does not come out, the
same trouble as above is suspected.
Check fluid leakage.
No problem, if there is no leak.
Check mounting angle. (Refer to the
table.)
If installed at an abnormal angle, though
rare, specified braking force is unobtain-
able or DSPV does not work.
As not installed in the
vehicle
Incline DSPV back and forth to see if the
ball moves insides.
No problem, if a ball sound is heard from
within.
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