N6336C SKIDDED OFF THE LEFT SIDE OF THE SOD STRIP DURING THE LANDING ROLL. THE PILOT REPORTED THAT THE RIGHT BRAKE FAILED TO RESPOND AND DIRECTIONAL CONTROL WAS LOST. THE AIRPLANE COLLIDED WITH TREES ADJACENT TO THE RUNWAY AREA. EXAMINATION OF THE WRECKAGE FAILED TO DISCLOSE A MECHANICAL MALFUNCTION OR FAILURE. THE RIGHT BRAKE ASSEMBLY ALSO OPERATED NORMALLY AT THE ACCIDENT SITE.