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 (5) is disposed between an expander piston (17) and a brake (2), and the cut-off valve (5) is operable independently of and separately from the expander piston (17). The cut-off valve (5) co-operates with a one-way valve (7) disposed between a master cylinder (1) and the brake (2) to hold the one-way valve (7) in an open position when the cut-off valve is in a closed position with the solenoid de-energised. This ensures that the one-way valve (7) can close only as a result of movement of the cut-off valve (5) into an open position which can occur only when the solenoid is energised in response to a skid signal.