Anti-skid hydraulic braking systems for vehicles

摘要

In an anti-skid braking system of the de-boost and pump to re-apply type, a solenoid-operated cut-off valve is disposed between an expander piston and a brake, and the cut-off valve is operable independently of and separately from the expander piston. The cut-off valve co-operates with a one-way valve disposed between a master cylinder and the brake to hold the one-way valve in an open position when the cut-off valve is in a closed position with the solenoid de-energized. This ensures that the one-way valve can close only as a result of movement of the cut-off valve into an open position which can occur only when the solenoid is energized in response to a skid signal.