Hydraulic brake release system

Details Hydraulic brake release system Hydraulic brake release system

1988-11-10

1991-02-05

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 7, 188151A, B60K 4126

Patent

active

049897039

ABSTRACT:
An all-hydraulic brake release system is disclosed for use on a vehicle having a transmission fluid pressure source, a brake fluid pressure source and a spring-applied, fluid pressure-released vehicle brake. The system has a control valve block which is hydraulically connected to the transmission fluid pressure source, the brake fluid pressure source and the brake. A first, transmission clutch pressure-responsive valve in the block controls the fluid connection between the brake fluid pressure source and the vehicle brake. A second, brake fluid pressure-responsive valve in the block controls the communication of brake fluid pressure to a pilot end of the first valve. If either brake fluid pressure or transmission clutch pressure falls below respective predetermined values, the first valve closes to cut off the supply of brake fluid pressure to the brake such that the brake is applied to stop vehicle movement.

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Schematic diagram entitled, "Split Service Brake System with High Pressure Drive Line Brake", (undated).

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