Abstract: The differential comprises a drive input element, two output cam members each rotatable about a common axis, each cam member having a single angular cam surface thereon of undulating form arranged such that the cam surfaces on the cam members converge towards each other and a plurality of cam followers. The followers have cam engaging end surfaces for imparting drive from the input element to the output cam members. Relative contro-rotation of the output cam members causes the cam followers to slide axially. The cam followers are elongate in direction of the common axis and are slidably supported throughout virtually their entire length by the drive input element. The followers may be arranged closely adjacent each other to provide a degree of mutual support.

Abstract: A hydraulic master cylinder has pistons displaceable along the pivot axis of a brake pedal to apply the vehicle brakes. Motion between the pedal and the pistons is transmitted by balls located in a respective arcuate track formed partly in the pedal and partly in the respective piston. The master cylinder is particularly suitable for dual circuit brake systems. A master cylinder having a single piston is also disclosed.