Brakes
PROPORTIONING VALVE
BR-8
4. Proportioning Valve
The proportioning valve prevents the rear wheels from locking and resultant skidding that would
occur during hard braking due to transfer of vehicle weight toward the front wheels. The valve dis-
tributes a reduced pressure to the rear wheel brakes as compared with the pressure to the front
wheel brakes when a specified master cylinder fluid pressure (called “split point”) is exceeded as
shown in the diagrams below.
VDC model
B4H2221C
Except VDC model
B4H1942B
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