Patent ID: 8807296

Claim:
A brake unit comprising in a housing: a piston, and a spindle in an axial slack adjuster, wherein an axial direction of the piston and an axial direction of the spindle are substantially perpendicular to each other and force transmitting means is provided between the piston and the spindle, said force transmitting means comprising wedge elements at an underside of the piston cooperating with a driver element coaxial with and force-transmittingly connected to the spindle, wherein the brake unit includes a three-point guiding where the driver element is supported by rolling friction with the housing for movements in the axial direction of the spindle, wherein the driver element includes on each side of the spindle a support roller for cooperation with a support plane in the housing, and the spindle is axially guided by the housing at a forward end thereof; and wherein the support roller is arranged coaxially with and outside of working rollers rotably arranged on the driver element for transferring force from the wedge elements on the piston to the driver element, and wherein the driver element is provided with a driver sleeve, which surrounds the spindle, extends forward into axially guided relationship with the housing and is internally provided with a guide for axially guiding the spindle.