Abstract: A braking system for a pair of in-line roller skates has a single hand-operated hydraulic actuator which is coupled through a Y coupling to a hydraulic brake assembly on each of the skates for applying braking force simultaneously to opposite sides of a roller on each of the skates. Each hydraulic brake assembly includes a rod extending longitudinally above the rollers to which is connected at least one resilient expander bow, each end of which contacts an engagement caliper. Two engagement calipers are hingedly mounted on the skate housing to apply frictional pressure simultaneously to generally opposite sides of each of the rollers on each of the skates.