ISUZU KB P190 2007 Workshop Repair Manual

5C-12 BRAKES
VACUUM SERVO WITH MASTER CYLINDER AND BRAKE PEDAL

N ⋅m (kgf ⋅m/lb ⋅ft)






This illustration is based on the RHD model
RTW 75CMF000201


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BRAKES 5C-13
BLEND PROPORTIONING VALVE N⋅m (kgf ⋅m/lb ⋅ft)



This illustration is based on the RHD model

RTW 75CMF000301


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5C-14 BRAKES
LOAD SENSING PROPORTIONING VALVE (LSPV) N⋅m(kgf ⋅m/lb ⋅ft)

RTW 35CLF000101

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BRAKES 5C-15
BRAKE PEDAL ASSEMBLY N⋅m (kgf ⋅m/lb ⋅ft)

This illustration is based on the RHD model
E05R300011-1

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5C-16 BRAKES
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH BLEND PROPORTIONING VALVE)
N ⋅m (kgf ⋅m/lb ⋅ft)






RTW 75CMF001901

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BRAKES 5C-17
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH LOAD SENSING PROPORTIONING VALVE)
N ⋅m(kgf ⋅m/lb ⋅ft)



RTW 65CMF000501

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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

RTW 75CLF000301



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ISUZU KB P190 2007

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 2at
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.


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5C-20 BRAKES

•
••
•
Operation
The operation of the P-valve by the master cylinde
r
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
4of the master cylinder side, overcomes the operating
force of the spring
3 + fluid pressure affecting the seal 2of
the wheel cylinder, and presses the piston
1to 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
3in 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.




RTW 75CSH001601

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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BRAKES 5C-21
LOAD SENSING PROPORTIONING VALVE (LSPV)
RTW 35CMF000101



Structure and Operation
The following is an explanation of the structure and operation
of the spring type load sensing device.
This device controls the fluid pressure to the rear brakes in
accordance with changes in rear axle load (vertical
displacements of the rear axle springs).





•
••
•
Structure
This device consists of a load sensing spring and a valve.
The valve is mounted through a bracket to the frame.
One end of the load sensing spring is fixed to the valve at the frame and the other end to the rear axle housing
through a bracket.


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