Abstract: A pair of caliper guides (56) are arranged at a brake carrier (10) in a manner so as to be protected from contamination by elastic boots (64). A floating caliper (22) is guided on the caliper guides (56) and straddles the brake disc (12) as well as a pair of brake pads (14,16). A tappet (42) is provided for brake actuation and is guided so as to be axially displaceable in the floating caliper (22) at one side of the brake disc (12). Its actuating forces are exerted through a pressure plate (54) on the adjacent brake pad (14). In the range of the caliper guides (56) the pressure plate (54) is formed with a recess (68) each in its edge for the corresponding elastic boot (64). The elastic boots (64) are covered by stiff, cup-shaped caps (66) engaging with radial clearance in a respective one of the recesses (68) formed in the edge of the pressure plate (54). A heat insulation plate (72) is positioned between the pressure plate (54) and the adjacent brake pad (41).

Abstract: A casing (10) has a bore (14) and a clutch face (48) concentric with the bore. In the bore (14) a tappet (30) of variable length is slidably guided and includes two threaded members (34,36) interconnected by a self-locking screw thread pair (38). A clutch member (50) connected to one of the two threaded members (34) by a non-self-locking screw thread pair (52) is associated with the clutch face (48). A support member (60 ) having an aperture (68) through which the other one of the two threaded members (36) extends is fixed to the casing (10). A clutch spring (70) is inserted between the support member (60) and the clutch member (50) and urges the clutch member (50) into abutment against the clutch face (48). A sealing boot (72) which is disposed outside of the support member (60) with respect to the casing (10) provides an external seal for the screw thread pairs (38,52) and the clutch member (50). The support member (60) and the sealing boot (72) are separately fixed to the casing (10).