A vehicle suspension system comprising: at least one suspension bellows, a source of pressurised fluid, a supply line which extends between the suspension bellows and the source of pressurised fluid via a raise/lower valve, and a manually operable operating member which is movable between a raise position, a lower position and a drive position, the operating member being connected to the raise/lower valve which is configured such that when the operating member is moved to the raise position, the raise/lower valve moves to a raise position in which the suspension bellows are directly connected to the source of pressurised fluid, when the operating member is moved to the lower position, the raise/lower valve moves to a lower position in which suspension bellows are vented to a low pressure region, and when the operating member is moved to the drive position, the raise/lower valve moves to a drive position in which the suspension bellows are connected to the or a further source of pressurised fluid via an electrically operated suspension valve assembly, wherein the raise/lower valve is further provided with a fluid pressure operated actuator which moves the raise/lower valve to the drive position when pressurised fluid is supplied to the actuator, and a pilot pressure line by means of which pressurised fluid is supplied to the actuator and characterised in that the pilot pressure line is connected to a pilot line source of pressurised fluid, which is one of the source of pressurised fluid or the further source of pressurised fluid or a further alternative source of pressurised fluid, via the suspension valve assembly, the suspension valve assembly being operable to control flow of fluid from the pilot line source of pressurised fluid into the pilot pressure line. at least one suspension bellows, a source of pressurised fluid, a supply line which extends between the suspension bellows and the source of pressurised fluid via a raise/lower valve, and a manually operable operating member which is movable between a raise position, a lower position and a drive position, the operating member being connected to the raise/lower valve which is configured such that when the operating member is moved to the raise position, the raise/lower valve moves to a raise position in which the suspension bellows are directly connected to the source of pressurised fluid, when the operating member is moved to the lower position, the raise/lower valve moves to a lower position in which suspension bellows are vented to a low pressure region, and when the operating member is moved to the drive position, the raise/lower valve moves to a drive position in which the suspension bellows are connected to the or a further source of pressurised fluid via an electrically operated suspension valve assembly, wherein the raise/lower valve is further provided with a fluid pressure operated actuator which moves the raise/lower valve to the drive position when pressurised fluid is supplied to the actuator, and a pilot pressure line by means of which pressurised fluid is supplied to the actuator and characterised in that the pilot pressure line is connected to a pilot line source of pressurised fluid, which is one of the source of pressurised fluid or the further source of pressurised fluid or a further alternative source of pressurised fluid, via the suspension valve assembly, the suspension valve assembly being operable to control flow of fluid from the pilot line source of pressurised fluid into the pilot pressure line.