A vehicle washing installation includes at least one side washing brush which is mounted on a crossbar of the vehicle washing installation by a suspension to be rotatable about first and second pivot axes. The suspension has a first actuator for pivoting the side washing brush about the first pivot axis. The problem of providing a vehicle washing installation which, with little constructional outlay, permits a good washing result even in the case of inclined side surfaces and rear surfaces of the vehicle and the inclined transitions between said surfaces is addressed in that the suspension has a second actuator for pivoting the side washing brush about the second pivot axis, and by a method with the steps of: detecting and/or determining the inclination of a first vehicle surface running transversely with respect to the longitudinal direction; pivoting the side washing brush from a basic position about the second pivot axis in a manner corresponding to the inclination of the first vehicle surface; and moving the side washing brush along the first vehicle surface.