Hydraulic anti-lock braking systems for vehicles.

摘要

In an hydraulic anti-lock braking system a modulator (14) incorporates a valve (5) responsive to anti-lock signals, a flow valve (10), and an expansion chamber (9) to which fluid is relieved from a brake (1) in an anti-lock mode. The flow valve (10) is arranged so that the output from a pump (15) is shared between the brake (1) and the master cylinder (3), and a restrictor (13) located in parallel with the flow valve is adapted to attenuate the pressure oscillations of the system.