INTEGRAL UNIT FOR SERVICE BRAKE AND FAIL-SAFE PARK BRAKE

An actuation mechanism for a multi-plate disc brake includes an energy storage element configured to apply said disc brake, the energy storage element being movable between a first position where said disc brake is released, and a second position where said disc brake is applied; a force transmission path configured to transmit force from the energy storage element to apply said disc brake; and a hydraulic chamber. The force transmission path includes a first member and a second member arranged in series; wherein the hydraulic chamber is configured, when pressurized, to act on the first member such that the energy storage element is moved to the first position; and wherein the second member is separated from the chamber such that, when the chamber is pressurized, no pressure is applied to the second member.