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A disc brake for a vehicle having a housing with a cavity therein that is divided by a thrust plate into a fluid chamber and an atmospheric chamber. A converter located in the fluid chamber includes a fixed reaction plate and a sliding plate that are separated by a plurality of balls located in vari

A disc brake for a vehicle having a housing with a cavity therein that is divided by a thrust plate into a fluid chamber and an atmospheric chamber. A converter located in the fluid chamber includes a fixed reaction plate and a sliding plate that are separated by a plurality of balls located in variable depth grooves in the sliding plate and a reaction plate. A rotary input applied to an input shaft caused the sliding plate to rotate and move linearly as the balls move within the grooves to provides a force that acts through the thrust plate to moves a piston that is located in the atmospheric chamber to effect a mechanical brake application. Pressurized fluid supplied to the fluid chamber acts on the thrust plate that moves thrust plate and moves the piston to effect a hydraulic brake application.

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I claim: 1. A disc brake for a vehicle having a housing (6) with a recess (14) therein that is separated by a thrust plate ( 42) to define a first chamber (54) that is connected to receive pressurized fluid from a source and a second chamber (56) connected to the surrounding environment, an actuato

I claim: 1. A disc brake for a vehicle having a housing (6) with a recess (14) therein that is separated by a thrust plate ( 42) to define a first chamber (54) that is connected to receive pressurized fluid from a source and a second chamber (56) connected to the surrounding environment, an actuator including an input shaft (26) and a converter (32) that is located in said first chamber (54), said converter (32) including a reaction plate ( 36) that is fixed from rotation within said first chamber (54), a sliding plate (34) secured to said input shaft (26) and housed within said thrust plate (42), a plurality of balls (40) retained in variable depth grooves ( 37) in the sliding plate (34) and reaction plate (36) and a sliding lining (46) located between the sliding plate ( 34) and thrust plate (42), said input shaft on receipt of a rotary input acting to convert rotational movement of the input shaft ( 26) into a sliding movement of the thrust plate (42) to provide a first force that acts on said thrust plate (42) and mechanically moves a piston (20) located in said second chamber (56) to effect a first brake application while pressurized fluid on being supplied to said first chamber (54) directly acts on and moves said thrust plate (42) to provide a second force to hydraulically move said piston (20) to effect a second brake application, return means (62) that only acts on said thrust plate (42) for urging said sliding plate (34) toward said reaction plate (36) to define a position of rest, an elastomeric seal (110) for returning the piston (20) to a position of rest within said recess (14), an adjuster (70) that is located between the thrust plate (42) and the piston (20) to compensate for wear of brake lining or linings (22, 24) of the brake, said adjuster (70) having a first conical member ( 74) that extends from the thrust plate (42) defines a first bearing piece (72), a second bearing piece (80) affixed to the piston (20), a wedge (82,182,282) located between said first (72) and second (80) bearing pieces, and a spring for moving said wedge (82,182,282) such that movement of said first bearing piece (72) is directed into said piston (20) through the second bearing piece (80). 2. The brake according to claim 1, characterized in that the adjuster (70) immobilizes the piston (20) with respect to the thrust plate (42) while when the thrust plate (42) slides in a first direction, and holds the piston ( 20) stationary when the thrust plate (42) slides in a second direction.