The invention relates to a motor vehicle servo brake with a control valve which can be operated by an electromagnet and independently of an actuation rod moving a valve piston. The electromagnet and other electrical means are supplied with current by electrical leads which extend through a cable bushing attached to be air-tight in the servo-brake housing. To reduce considerably the costs which are incurred during manufacture of the cable bushing (7), the invention provides for the cable bushing (7) to be in the form of a plastic injection moulded member inside which the electrical leads (18, 19) are partially stripped.
