A disc brake wherein first and second friction member are aligned by first and second rails with a rotor. A piston retained in a caliper has a first radial groove separated from a second groove in a carrier for the first friction member by an oval member. The piston responds to pressurized fluid to create a braking force that acts the piston to move the first friction member into engagement with the rotor. On engagement with the rotor the first friction member rotates to bring the carrier into abutment engagement with the rail and at the same time the oval member pivots within the second groove to push the housing such that a running clearance is eliminated with the rotor such that the pressurized fluid may thereafter act on the housing to define a clamping force between the first and second friction members and rotor to effect a brake application.