Primary and secondary pressure-balanced proportioning valve

Details Primary and secondary pressure-balanced proportioning valve Primary and secondary pressure-balanced proportioning valve

B - Operations, Transporting

60

T

303/87

B60T 15/00 (2006.01) B60T 8/26 (2006.01) B60T 11/16 (2006.01) B60T 11/34 (2006.01) B60T 17/22 (2006.01)

Patent

CA 2000771

PRIMARY AND SECONDARY PRESSURE-BALANCED PROPORTIONING VALVE ABSTRACT OF THE DISCLOSURE The proportioning valve assembly (40, 140) may be screwed into a complementary-shaped opening in a master 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 dif- ferential area piston (50, 150) of the proportioning 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 assem- bly (40, 140) actuates the differential area piston (50, 150) to permit fluid flow to bypass the piston (50, 150) and be communicated directly to the rear brakes of the vehicle.

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