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In an anti-skid braking system a brake is applied in response to the pressure of a supply of hydraulic fluid passed through a first variable orifice from a pump rotatable with rotation of a wheel to be braked so that the wheel is automatically prevented from locking. The system incorporates a second

In an anti-skid braking system a brake is applied in response to the pressure of a supply of hydraulic fluid passed through a first variable orifice from a pump rotatable with rotation of a wheel to be braked so that the wheel is automatically prevented from locking. The system incorporates a second variable orifice in combination with a pre-loaded spring against which a shuttle provided with the orifice is adapted to be displaced to reduce the pressure of the supply from the pump.

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An hydraulically operated anti-skid braking system for a vehicle comprising brake applying means, a reservoir comprising a container for hydraulic fluid, an hydraulic pump rotatable with rotation of said wheel and having an input connected to said reservoir and an output connected to said brake appl

An hydraulically operated anti-skid braking system for a vehicle comprising brake applying means, a reservoir comprising a container for hydraulic fluid, an hydraulic pump rotatable with rotation of said wheel and having an input connected to said reservoir and an output connected to said brake applying means, a leakage path between the output of said pump and said reservoir, a first variable orifice in said leakage path, said brake applying means being responsive to the supply of hydraulic fluid from said pump and passing through said first variable orifice, means for automatically varying the size of said first orifice in response to wheel speed to prevent said wheel from locking upon operation of said brake applying means, second variable orifice means upstream of said brake applying means, and means cooperating with said second variable orifice means to provide a pressure drop of substantially constant value across said second variable orifice means over the range of wheel speeds and consequently a more linear wheel speed analogue of the pressure supplied by said pump to said brake applying means.