THE PLT REPORTED THAT THE PVT ARPT AT THE DESTINATION HAD A UNIDIRECTIONAL STRIP WITH HI OBSTRUCTIONS ON BOTH ENDS. OBSTACLES, RWY SLOPE & NOISE ABATEMENT CONSIDERATIONS REQUIRED THAT RWY 4 BE USED FOR LANDINGS. AT 1351 EST, THE WIND AT CHARLOTTE, NC WAS FROM 220 DEG AT 16 GUSTING 27 KTS. DURING ARRIVAL AT CONCORD, THE FINAL APCH WAS FLOWN AT 100 MPH. A WITNESS REPORTED THAT THE ACFT TOUCHED DOWN ABOUT 1350 FT FROM THE APCH END, THEN BOUNCED 2 OR 3 TIMES. THE PLT WAS UNABLE TO STOP ON THE RWY & INTENTIONALLY GROUND LOOPED THE ACFT AFTER TRAVELING BEYOND THE DEPARTURE END. HE STATED THAT THE LEFT BRAKE WAS NOT WORKING SUFFICIENTLY & HE USED RUDDER & DIFFERENTIAL POWER FOR DIRECTIONAL CONTROL. SKID MARKS WERE FOUND STARTING ABOUT 2000 FT FROM THE APCH END OF THE RWY. STOPPING DISTANCE FOR THE CONDITIONS WAS CALCULATED TO BE 2711 FT; THE ACFT HAD TOUCHED DOWN WITH ABOUT 2050 FT REMAINING. WHEN CHECKED AFTER THE ACCIDENT, THE BRAKE PEDALS FELT SPONGY. THE LEFT BRAKE PAD WAS DISCOLORED BLUE.