What was found
AIRCRAFT DEPARTED. GOING THROUGH 2,000 FEET, CREW NOTICED MAIN BRAKE AND EMERGENCY BRAKE PRESSURE GAUGES READ AN OVERPRESSURE OF 3,000 PSI. ALSO BOTH BRAKE APPLIED PRESSURE GAUGES WERE READING 1,000 PSI. CREW PERFORMED QRH PROCEDURE. RETURNED TO DEPARTURE DUE TO CONCERNS THAT THE BRAKES MAY BE LOCKED. DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE HAS VERIFIED THE HIGH PRESSURE READINGS WERE AN INDICATION ISSUE. MAINTENANCE IS STILL IN PROCESS OF TROUBLESHOOTING PROBLEM.