Disc brakes for railway vehicles

A disc brake for a railway vehicle comprising a rotatable disc, a stationary drag-taking member adjacent to said disc, a rigid caliper straddling the peripheral edge of said disc and including opposed limbs located on opposite sides of said disc, friction pads for engagement with opposite faces of said disc located in said caliper, actuating means associated with one of said limbs for applying one of said friction pads directly to an adjacent one of said faces of said disc, the other of said friction pads being applied to the other one of said faces of said disc by the reaction on said caliper of said actuating means which causes said caliper to move with respect to said disc, a drag-transmitting arm carrying said caliper from said drag-taking member, a pivotal connection for connecting one end of said arm to said drag-taking member for pivotal movement about an axis normal to the axis of said disc, a spherical joint for coupling said caliper to said arm, and a restraint connection between said arm and said caliper for permitting small movements of said caliper relative to said arm in axial and radially transverse directions, for restraining larger subsequent movements of said caliper in said directions, and for restoring said caliper to a neutral position when said brake is not applied.