Hydraulic brake booster with shut-off means

Details Hydraulic brake booster with shut-off means Hydraulic brake booster with shut-off means

B - Operations, Transporting

60

T

303/74

B60T 13/16 (2006.01)

Patent

CA 1041576

ABSTRACT OF THE DISCLOSURE A motor vehicle fluid power circuit is disclosed in which a pump driven by the engine of the vehicle assists the operator in braking the vehicle and in steering the vehicle. The circuit includes a pump, a brake booster, and a steering valve. A valve spool throttles fluid flow from the pump to the steering valve to maintain the outlet pressure of the pump at least a predetermined pressure differential above the working pressure of the brake booster. The brake booster includes a shut-off means which hydraulically isolates the pressure side of the pump from the brake booster when the brake booster reaches a predetermined shut- off pressure which is less than the relief pressure of the pump relief valve so that operation of the brake booster cannot actuate the relief valve of the pump. -2-

219186

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