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In an hydraulic anti-skid braking system for a vehicle a supply of fluid from a master cylinder is modulated by a modulator assembly in accordance with skid signals from a skid sensing means device, and an hydraulic pump incorporating at least one plunger has a working chamber in communication with

In an hydraulic anti-skid braking system for a vehicle a supply of fluid from a master cylinder is modulated by a modulator assembly in accordance with skid signals from a skid sensing means device, and an hydraulic pump incorporating at least one plunger has a working chamber in communication with the modulator assembly to control brake re-application following skid correction. The modulator assembly incorporates a piston which is normally urged into an advanced inoperative position against a stop by a spring, in which position the piston holds a spring-loaded valve in an open position to place the master cylinder in communication with the brake. Support and expander chambers on opposite sides of the piston are interconnected at all times by a restricted passage with the support chamber defined in a bore in which the piston is guided to slide, between the piston and normally closed dump valve. Thus the position of the piston in the bore is determined by the loading in the spring either augmented or opposed by a force applied to the piston due to any pressure drop across the restricted passage.

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An hydraulic anti-skid braking system for a vehicle having a wheel, comprising a brake for braking the wheel, a supply of brake-operating fluid for applying said brake, skid sensing means for said wheel for producing skid signals, a modulator assembly for modulating said brake-applying fluid from sa

An hydraulic anti-skid braking system for a vehicle having a wheel, comprising a brake for braking the wheel, a supply of brake-operating fluid for applying said brake, skid sensing means for said wheel for producing skid signals, a modulator assembly for modulating said brake-applying fluid from said supply to said brake in accordance with said skid signals, and an hydraulic pump incorporating at least one plunger working in a bore and having a working chamber which is in communication with said modulator assembly to control brake re-application following skid correction, wherein said modulator assembly comprises a housing provided with a wall defining a bore, a piston working in said bore and movable between a first advanced inoperative position and a second retracted position spaced from said inoperative position, a stop with which said piston in adapted to co-operate to define said first inoperative position, a spring for urging said piston towards said stop, a spring-loaded one-way valve adapted to be operated by said piston, said one way-valve being movable between an open position and a closed position, an inlet port connected to said supply, an outlet port connected to said brake, said one-way valve being held in said open position to place said inlet port in communication with said outlet port when said piston is in said first position, means defining support and expander chambers in said bore on opposite sides of said piston, a reservoir for fluid, a dump valve between said support chamber and said reservoir, and a restricted passage providing at all times a permanent connection between said support and expander chambers, and wherein the position of said piston in said bore is determined by the loading in said spring either augmented or opposed by a force applied to said piston due to any pressure drop across said restricted passage.