Isuzu KB P190. Manual — part 179
BRAKES 5C-17
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH LOAD SENSING PROPORTIONING VALVE)
N
⋅m(kgf⋅m/lb⋅ft)
RTW65CMF000501
5C-18 BRAKES
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH ABS)
N
⋅m (kgf⋅m/lb⋅ft)
This illustration is based on the RHD model
RTW75CLF000301
BRAKES 5C-19
SERVICING
BLEND PROPORTIONING VALVE (IF SO EQUIPPED)
Structure and Operation
•••• Structure
Side
a
shows P-valve; side
b
shows bypass valve.
Bypass valve seals the routes
4
and
5
using the seal
2
at
the piston
1
end.
In addition, spring
3
presses against the piston
1
, and in
order to seal out the route
4
and route
5
sufficiently, spring
3
presses seal
2
against cylinder end surface.
The left figure is a characteristic curve diagram.
5C-20 BRAKES
•••• Operation
The operation of the P-valve by the master cylinder
pressure is unchanged up to the brake points
A
and
B
.
If master cylinder fluid pressure penetrates into the second
break point
B
, the fluid pressure pressing against the seal
, (which isolated route
4
and route
5
), passing the route
4
of the master cylinder side, overcomes the operating
force of the spring
3
+ fluid pressure affecting the seal
2
of
the wheel cylinder, and presses the piston
1
to the right
side, resulting in the opening of the routes
4
and
5
, and
canceling of the P-valve operation.
Then, because the master cylinder fluid pressure and the
wheel cylinder fluid pressure, up to the point
C
, operate on
the identical surface of the seal , both have identical
ascending ratios.
However, because of the operation of spring
3
in the wheel
cylinder side, wheel cylinder fluid pressure operates to
preserve the balance against the master cylinder fluid
pressure on the lower level with the difference in pressure
resulting from this spring.
RTW75CSH001601
Valve Maintenance
In the case of a fluid leak or other abnormality, the faulty valve
should be replaced.
The valve is set up at the engine room.
Note:
The blend proportioning valve is not repairable and must
be replaced as a complete assembly.
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