TRUCK WAS BROKEN DOWN AT BASE OF HAUL ROAD WITH TRUCKS STOPPED WAITING. WHEN OPERATOR APPLIED BRAKES THE TRUCK DIDN'T SLOW SO HE PULLED THE PARK BRAKE. WHEN THIS FAILED TO STOP THE TRUCK HE WE NT ALL THE WAY UP AN ESCAPE RAMP. AFTER A FEW SECONDS THE TRUCK TURNED ONTO THE DRIVER'S SIDE. THIS RESULTED IN MINOR BUMPS AND BRUISES TO THE DRIVER.