Abstract: An hydraulic valve assembly controls the supply of hydraulic fluid to an hydraulic strut of a vehicle suspension and is formed in a valve block having an hydraulic delivery line between a pump delivery port and the strut via a check valve which allows flow in one direction only from the pump to the strut. Three parallel hydraulic lines connect the delivery line to a fluid return line. One line has a relief valve that only opens if there is excess pressure in the delivery line. Another line has a series connection of a solenoid-operated pressurizing valve and a pressure-sensing valve. Both valves are normally open, the solenoid-operated valve being closed when the suspension becomes too low, and the pressure-sensing valve closing when pressure at the strut port falls. The other hydraulic line includes a normally-closed solenoid-operated depressurizing valve and a normally-open relief valve.