What was found
DEN - AFTER TAKEOFF FOR FLIGHT 4342 (DEN-YYC) RECEIVED A BRAKE OVERHEAT WARNING CLIMBING THROUGH 17,000 FEET. PER THE CHECKLIST, LOWERED THE LANDING GEAR AND MESSAGE WENT OUT. RESET THE BRAKE TEMPERATURE MONITORING SYSTEM. NR 4 BRAKE READ 17 AT HOTTEST POINT. RETURNED TO THE FIELD AND ACCOMPLISHED AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED LANDING GEAR AND WHEELS AND BRAKES. THERE WERE NO SIGNS OF OVERHEATING. AS A PRECAUTION, REPLACED THE NR 4 BRAKE, WHEEL, AND TEMPERATURE SENSOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.