Brake motor having a resettable automatic adjustment device

A brake motor comprising a brake piston sliding in a bore in a body and actuatable hydraulically and mechanically by a mechanical control to move a friction member via an automatic adjustment device of reversing thread nut/screw type comprising an adjustment member locked in rotation carried by a front wall of the brake piston which is adjacent the friction member and interacting with a rotating adjustment member biased by a spring and in free frictional engagement against a non-rotating component of the mechanical control, and means manually actuatable for resetting the automatic adjustment device, characterized in that the adjustment member locked in rotation comprises an integral end which is integral with the adjustment member locked in rotation and passing sealingly and slidably through the front wall of the brake piston, means for frictional engagement working at least when the brake motor is in operation and being provided between the brake piston and the adjustment member locked in rotation to lock the adjustment member locked in rotation, the integral end of the adjustment member locked in rotation being rotatably actuatable exteriorly and manually to carry out resetting of the automatic adjustment device, the integral end extending through the front wall and non-rotatably attached to a resetting member disposed axially between the front wall of the brake piston and the friction member, and adjustment member locked in rotation actuatable, via the resetting member, to effect said resetting without requiring axial displacement of the adjustment member locked in rotation and resetting member.