What was found
AC LANDED AND DISCOVERED THEY HAD NO RT BRAKE. AC LOST DIRECTIONAL CONTROL AND IMPACTED A PARKED AIRCRAFT CAUSING SUBSTANTIAL DAMAGE TO THE PARKED AIRCRAFT. INVESTIGATION REVEALED THE RT BRAKE O-RING WAS FLAT AND THE HOUSING AND DATA PLATE SHOWED EXTREME HEAT. REVIEW OF THIS SITUATION FOUND THAT THERE HAVE BEEN MANY OWNER REPORTS IN THE OWNERS NEWSLETTER OF RT BRAKE FAILURES DUE TO THE NEED TO STEER THE AC WHICH HAS A CASTERING NOSE WHEEL.