Vehicle brakes

A vehicle brake actuator comprising a housing, a wedge member in the housing, follower members in the housing displaceable apart in response to movement of said wedge member and presenting inclined surfaces arranged one on each side of said wedge member, at least one roller interposed between each of said inclined surfaces and the co-operating surface of the wedge member, and a cage in which said rollers are retained, wherein said cage and said rollers constitute an independent cage assembly unattached to said wedge member, said cage assembly and one of said follower members are formed with corresponding abutment means which limit the travel of the cage assembly in the direction of movement of said wedge member, and stop means are provided for limiting movement outwardly of the housing of said one follower member.