BASIC BRAKE SYSTEM ± On-vehicle Service
35A-9
LOAD SENSING PROPORTIONING VALVE
FUNCTION TEST
1. Connect pressure gauges to the input and output ports
of the load sensing proportioning valve.
2. Bleed the system. (Refer to P.35A-10.)
3. Disconnect the spring at the support side.
4. Place the spring so that it is in parallel with the load sensing
proportioning valve, and then pull in the direction indicated
by arrow A so that its length H shown in the figure (the
length between its ends) is as noted below.
NOTE
At this time the lever is pressed all the way to the load
sensing proportioning valve side.
5. Check at this time whether or not the output fluid's pressure,
relative to the load sensing proportioning valve's input fluid
pressure, is within the standard value.
Standard value:
Spring length
H mm
Input fluid
pressure MPa
Output fluid pressure
MPa
199*
1
9.8 4.2 ± 6.0
217*
2
9.8 9.7 ± 10.5
16.7 14.5 ± 16.3
NOTE
*
1
and *
2
indicate the applicable lengths for unladen
and laden vehicles respectively.
6. Measure each output fluid pressure at both valves, and
check that the difference between the two is at the limit
value or less.
Limit: 0.39 MPa
7. After making the check, install the spring. Disconnect the
pressure gauges from the load sensing proportioning valve
and bleed air.
Pressure gauge
Load sensing pro-
portioning valve
Lever
A
H
Load sensing spring
Load sensing pro-
portioning valve
Parallel
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