Abstract: In a disc brake of a type having a caliper slidably supported and having, on one side of a disc, a cylinder containing therein a piston for loading an inner pad against the disc and, on the other side of the disc, a limb portion for loading an outer pad against the disc, the flexural rigidity of the limb portion is made less on a leading side thereof located upstream with respect to the rotational direction of the disc for loading a leading or upstream side of the outer surface of the outer pad relating to a trailing side of said limb portion located downstream with respect to the rotational direction of the disc for loading a trailing or downstream side of the outer surface of the outer pad, so as to prevent frictional vibrations of the outer pad.

Abstract: A ventilated disk brake includes a pair of brake pads which is substantially the same as the prior art, and a rotor. The rotor has a brake-pad engaging portion in which a pair of brake-pad engaging walls are formed to be pressed between and by the pair of brake pads. A plurality of cooling ribs extend radially between the pair of brake-pad engaging walls. The cooling ribs are formed in such a manner that the weight distribution thereof is ununiform in the peripheral direction thereof along the brake-pad engaging portion. For example, the cooling ribs can be different in thickness, length and/or arrangement interval. such a design can be made on the basis of empirical data.

Abstract: A friction pad of a disc brake is indirectly actuated through a yoke to move between brake application and brake release positions with respect to a braking disc. Supports on the yoke each have elastomeric bushings arranged to slidingly receive a collar on a rod fixed to the stationary hydraulic cylinder so as to guide the yoke in its movements. The elastomeric bushings are so configured that the elastomeric bearings slide over the collars with less frictional resistance during brake application movement than during brake release movement.