Abstract: Hydraulic system and method for controlling pressure in a hydraulic system for a vehicle transmission with at least a primary friction element (2) and a secondary friction element (3) for coupling and transmitting engine power to the wheels of the vehicle by actuation of the friction elements (2) via the hydraulic system, comprising; supplying pressurized fluid to a line pressure circuit (7) by means of a pressure pump system having at least two outlet lines (5); providing a bypass circuit (9) on the pressure pump system that, when the bypass circuit (9) is open to allow flow therethrough; providing a bypass operating element (11) for controlling the bypass circuit (9) via a bypass valve (10); wherein the bypass operating element (11) additionally controls the secondary pressure on the secondary friction element (3) via a secondary valve (19); such that in a determined state; the bypass operating element (11) is actuated to open the bypass circuit (9) to reduce the flow to the line pressure circuit (7) and ad