What was found
DURING INITIAL CLIMB, FLIGHT CREW NOTICED A SMOKE ODOR AND VISUALLY CONFIRMED SEEING A SMALL AMOUNT OF SMOKE IN CABIN. ELECTED TO DECLARE AN EMERGENCY AND RETURN TO FIELD. DURING DOWNWIND FOR THE RUNWAY, SMOKE DISSIPATED. MADE AN UNEVENTFUL LANDING AND TAXIED TO THE RAMP. A MAINTENANCE TECH NOTICED SMOKE COMING FROM THE RT INBD BRAKE. TEMPERATURE OF BRAKE SHOWED APPROXIMATELY 370 DEGREES. DURING INSPECTION, NOTED ONE BLEED FITTING LEAKING. PACKINGS WERE REPLACED, BRAKES CLEANED, AND LEAK CHECKED NORMAL. LEAKING FITTING AND EXTENSIVE TAXI TO RUNWAY CAUSED AIR-CONDITIONING SYSTEM TO INGEST SMOKE FROM HOT BRAKE.