The present invention relates to a method for disconnecting a valve unit (302) from a pneumatically controlled actuator arrangement (208, 210) of a vehicle transmission (100), said transmission comprising at least one clutch arrangement (202, 204), a pneumatically controlled actuator arrangement (208, 210) arranged to controllably position the at least one clutch arrangement between a closed position and an opened position, and a valve unit (302) mechanically connected to the pneumatically controlled actuator arrangement (208, 210), the method comprising the steps of positioning (S1) the valve unit (302) in an opened state for providing compressed air to the pneumatically controlled actuator arrangement (208, 210); and subsequently disconnecting (S4) the valve unit (304) from the pneumatically controlled actuator arrangement (208, 210).