Abstract: A disk brake device disclosed herein comprises a brake caliper having a first and a second clamp arms that bridge over the brake disc, a movable friction pad connected to a pad pushing device disposed on the first clamp arm and opposing one side surface of the brake disc, a fixed friction pad disposed on the internal surface of the secnd clamp arm to oppose the other side surface of the brake disc, the fixed friction pad having a back plate, and a stopper detachably connected to the rear of the back plate. The second clamp arm has a window, which has a shape smaller than the back plate, opening to both internal and external side surfaces thereof, and a plurality of notches formed in opposed inner edges of the window.

Abstract: An improved screw type disc brake device particularly adapted for a small type automotive vehicle is disclosed in which a male screw member of a relatively large screw lead is screw-engaged with a caliper arm supporting a movable friction pad so that thrust due to forward rotation of the male screw member is utilized as an urging force to bring the movable friction pad into pressure contact with the brake disc. An automatic gap adjustment device is interposed between the male screw member and the movable friction pad for providing the movable friction pad with an advance feed for every reciprocating rotation of the male screw member. A manual adjustment bolt is screw-engaged through the center of the male screw member for adjusting the position of backward movement of the movable friction pad via the automatic gap adjustment device.