Multi-disc brake actuator for vibration damping

A multi-disc brake and actuator for vibration damping, comprising a multi-disc brake disposed about axle means and including a piston housing engaging a torque tube, the piston housing and torque tube circumferentially movable relative to the axle means, a first plurality of discs engaging the torque tube, a second plurality of discs for engagement with a wheel, the piston housing being located axially between an actuator and a first axially stationary member at the axle means, and a thrust sleeve engaging a second axially stationary member at the axle means, operation of the actuator causing an actuator member to extend axially and compress the piston housing between the actuator member and first axially stationary member in order to reduce vibrational movement of the piston housing and torque tube relative to the axle means.