Abstract: A braking system for a vehicle is responsive to vehicle dynamic operating conditions to provide enhanced braking when vehicle instability is detected. In one version braking force as a function of brake pedal force is increased. In another version an actuator takes up free play in a brake clamping device. The system may additionally respond to operator controls indicating possible full braking action; such as rapid release of an accelerator.

Abstract: A brake pressure proportioning controller is described for the rear wheel brakes of an automotive vehicle with a brake unit equipped with an anti-locking control, the brake pressure controller being provided with a lockout arrangement in which an electromagnetic drive prevents the brake pressure controller from performing its pressure reducing function as long as the anti-locking control is functioning. The lockout arrangement includes an actuating element (6) which is axially slidable by the drive (1), an intermediate bushing (8) is formed with radial round holes (34, 34') in which interlocking ball elements (31, 31') are guided in radial directions which are thicker than the wall of the intermediate bushing (8) and which are normally retained by the actuating element (6) in a position in which they lock any axial movement of the control element (9) in the direction of the electromagnetic drive (1).