What was found
ON TAXI TO RWY 25 KDEN UPON REACHING RUNWAY WE RECEIVED A LEVEL 2 BRAKE OVERHEAT WARNING. STOPPED AIRCRAFT AND DETRMINED THE #6 TIRE / BRAKE INDICATED 650C ALL OTHER BRAKES INDICATED 300 OR LESS. WE ONLY USED RIGHT BRAKE AND ALLOWED TEMP TO DROP TO 550C AND ATTEMPTED TO TAXI BACK TO RAMP. AFTER A SHORT TAXI NOT USING LEFT BRAKE IT STARTED TO CLIMB AGAIN. STOPPED AC. BRAKE INDICATED 750C WE THEN HAD A LEVEL 2 TIRE "FAILURE" REMOVED AND REPLACED #6 MLG TIRE AND WHEEL ASSY IAW MD AMM 11 32-41-01-4. WRI 32-43/2349 REMOVED AND REPLACED #6 BRAKE ASSY IAW MD11 AMM 11 32-43-20-4 OPS AND LEAK CHECK GOOD.