Primary pressure-balanced proportioning valve

Details Primary pressure-balanced proportioning valve Primary pressure-balanced proportioning valve

B - Operations, Transporting

60

T

303/87

B60T 8/26 (2006.01) B60T 11/16 (2006.01) B60T 11/34 (2006.01)

Patent

CA 1301218

PRIMARY PRESSURE-BALANCED PROPORTIONING VALVE ABSTRACT OF THE DISCLOSURE The proportioning valve assembly (40, 140) may be screwed into a complementary-shaped opening in a mas- ter cylinder (10). The valve assembly (40, 140) includes a differential area piston (50, 150) biased by a spring (70, 170) toward the outlet (21, 121) which communicates with the rear brakes. The master cylinder (10) includes a pair of passageways (16, 18) which communicate primary fluid pressure and secondary fluid pressure directly to the differential area piston (50, 150) of the proportion- ing valve assembly (40, 140) to displace the piston (50, 150) to a balanced position. If there is a failure of pressure in the primary brake circuit, the proportioning valve assembly (40, 140) actuates the differential area piston (50, 150) to permit fluid flow to bypass the pis- ton (50, 150) and be communicated directly to the rear brakes of the vehicle.

561366

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