A disc brake includes an actuation mechanism, and first and second brake pad mounting structures to be located, in use, adjacent opposing inboard and outboard faces, respectively, of a brake rotor to be braked. The disc brake further includes first and second brake pads located by the first and second mounting structures, respectively, such that upon application of the actuation mechanism, the brake pads clamp the brake rotor, and brake torque is reacted by the brake pad mounting structures. The first brake pad has a different functional requirement to the second brake pad such that fitment of the first brake pad in the second brake pad mounting structure and/or the second brake pad in the first brake pad mounting structure impairs the safety, functionality or durability of the brake. To prevent or inhibit such incorrect fitting, the first brake pad includes on a peripheral face or a rear face thereof a first formation in such a location that it may only be successfully fitted in the first brake pad mounting structure and only successfully fitted in the correct orientation with the brake fully assembled. The second brake pad includes a second formation different from the first formation such that it may only be successfully fitted in the second brake pad mounting structure and only successfully fitted in the correct orientation with the brake fully assembled.