What was found
DURING FIRST MAJOR LEFT TURN AT TAXI SPEED, WHILE APPLYING STEADY LIGHT BRAKE PRESSURE TO THE LT BRAKE, TO SHARPEN UP THE TURN, THE BRAKE PEDAL SLOWLY BUT CONTINUOSLY FADED ALL THE WAY TO THE FLOOR. IMMEDIATELY PUT THE POWER LEVER INTO BETA TO SLOW THE ACFT. IN THE RADIUS OF THE TURN, AS THE BRAKE PEDAL IS GOING TO THE FLOOR, STARTING TO LOOSE DIRECTIONAL CONTROL OF THE ACFT. SLOWED THE ACFT TO THE POINT WHERE ONLY THE NOSE WHEEL STEERING WOULD CONTINUE THE TURN. UPON COMPLETION OF THE TURN, ATTEMPTED TO APPLY LT BRAKE PRESSURE. THE PEDAL WASN'T AT THE FLOOR ANYMORE, BUT IT WASN'T A SOLID BRAKE PEDAL EITHER. AFTER A COUPLE OF PUMPS ON THE BRAKE PEDAL IT FELT COMPLETELY NORMAL. THERE WERE 2 MORE BIG LT TURNS PRIOR TO REACHING MY OVERNIGHT PARKING AREA. THE ACFT BRAKE PEDAL RESPONDED EXACTLY THE SAME WAY AS THE FIRST INCIDENT, SO 3 EXACT SENARIOS IN A ROW. ALL THE LT TURNS MADE AFTER LANDING (BUT BEFORE THE REPOSITION ) WERE MADE WITH THE SAME TECHNIQUE OF STEADY LIGHT BRAKE PRESSURE AND THE BRAKE PEDAL FELT SOLID ALL THROUGH THE TURN.