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BRAKES 5C-15
BRAKE PEDAL ASSEMBLY
This illustration is based on RHD model
LHD model is opposite.
E05R300011-1
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5C-16 BRAKES
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH BLEND PROPORTIONING VALVE)
RTW45CMF000401
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BRAKES 5C-17
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH LOAD SENSING PROPORTIONING VALVE)
Nm(kgfm/lbft)
29-39 (3.0-4.0/22-29)13-19 (1.3-1.9/9.4-14)11-20 (1.1-2.0/8-14) 13-19 (1.3-1.9/9.4-14) 7.8-18 (0.8-1.8/5.8-13)13-19 (1.3-1.9/9.4-14)
Eye Bolt Tightening
05020
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5C-18 BRAKES
BRAKE LINES (HOSES AND PIPES)
(MODEL WITH ABS)
Nm(kgfm/lbft)
This illustration is based on RHD model. RTW35CLF0002
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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
2, (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
2, both have identical
ascending ratio.
However, because of the operation of spring
3 in the wheel
cylinder side, wheel cylinder fluid pressure operate to
preserve the balance against the master cylinder fluid
pressure on the lower level with the difference in pressure
resulting from this spring.
03260002-2
Valve Maintenance
In the case of fluid leak or other abnormalities, 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
LAOD SENSING PROPORTIONING VALVE (LSPV)
RTW35CMF000101
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 a
t
the frame and the other end to the rear axle housing
through a bracket.
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5C-22 BRAKES
RTW35CSH001001
Operation
1) Outline
When the LSPV (Load Sensing Proportioning Valve)
detects a change in load weight, the load sensing spring
stretches.
Its reaction force is transmitted to the bottom of the load
sensing valve to secure an optimum rear wheel cylinde
r
fluid pressure break point in proportion to the actual load
weight.
Besides, if the front brake system should fail, the device is
designed to prevent the master cylinder fluid pressure from
decreasing and to apply it directly to the rear wheel cylinde
r
to obtain a sufficient braking performance.
RTW35CSH001101
2) Bellow cutting point.
The Force (F) keeps the main piston (1) the rest position.
The inlet pressure (A) and outlet pressure (B) are the same
as well as the inlet pressure (C) from front master cylinder.
The bypass piston (2) is kept on rest position by equilibrium
of the pressures (A) and (C) and the bypass spring load (3).
RTW35CSH001201
3) Cutting point.
The cutting point is given by relation between force (F), tha
t
is the load applied by suspension of the vehicle and the
main piston area (1). The cutting point is achieved when the
force generated by hydraulic pressure is upper than the
force (F) given by the load suspension. The main piston (1)
moves from the rest position closing the valve. In this
moment the inlet pressure (A) is upper than the outle
t
pressure (B). The bypass piston (2) continues on the res
t
position by equilibrium of (A) and (C) pressure.