A MOONEY 201 PLT RPTED THAT HE MADE 5 DIFFERENT LNDGS IN AN ACFT; TWO OF WHICH RESULTED IN DEPARTING THE RWY AT 2 DIFFERENT ARPTS.

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I HAD JUST LANDED AT GED. THE PLANE WAS RENTED. I HAD ABOUT 20 HRS IN ANOTHER MOONEY AND NEARLY 200 HRS IN COMPLEX SINGLE-ENG AIRPLANES. AS I WAS ROLLING OUT; AND APPLYING THE BRAKES; THE PLANE SUDDENLY SWERVED TO THE R AND PROCEEDED TO ROLL OFF OF RWY 4 ONTO WET GRASS. I THOUGHT IMMEDIATELY THAT I HAD BLOWN THE R MAIN TIRE. HOWEVER; AFTER SHUTTING THE PLANE DOWN; I SAW THAT NOTHING HAD BEEN DAMAGED (GEAR; GEAR DOORS; TIRES). I PROCEEDED TO CALL UNICOM. A SMALL TOW TRUCK WAS DISPATCHED TO TOW ME ONTO THE RWY AND THEN IN FRONT OF THE FBO. A FURTHER CHK OF THE GEAR AND TIRES REVEALED NO DAMAGE. I THOUGHT PERHAPS THAT SOME WATER HAD INFILTRATED INTO THE BRAKE MECHANISM WHICH HAD THEN FROZEN DURING THE FLT. MY ORIGINAL INTENTION WAS TO FLY TO PHL. BEFORE LEAVING; THOUGH; I DECIDED TO DO 1 CIRCUIT AT GED TO MAKE SURE THE GEAR AND BRAKES WERE ALL RIGHT. I STARTED THE PLANE OFF; PAID CAREFUL ATTN TO TEST THE BRAKES BEFORE AND DURING MY TAXI TO THE ACTIVE RWY AND TOOK OFF. THE GEAR RETRACTED AND THEN EXTENDED WITHOUT INCIDENT. THE LNDG WAS WITHOUT ANY PROBS. I THEN PROCEEDED FOR THE TRIP TO PHL. AFTER LNDG AT PHL ON RWY 35; AND DURING THE ROLLOUT; AS I BEGAN APPLYING THE BRAKES; THE PLANE AGAIN SWERVED TO THE R; AND OFF THE RWY ONTO THE GRASS. I TOLD THE TWR WHAT HAD HAPPENED; THAT THE PLANE AND PAX WERE FINE; AND TOLD HIM THAT I WOULD LIKE TO TAXI CAREFULLY ONTO THE NEAREST TXWY ENRTE TO THE FBO. WITH HIS CONCURRENCE; I DID SO WITHOUT INCIDENT; SHUT THE PLANE DOWN; AND AGAIN INSPECTED THE GEAR; BRAKES AND TIRES. THERE WAS NO DAMAGE. BEFORE TAKING OFF; AND AT THE REQUEST OF PHL TWR; I TELEPHONED A SUPVR IN THE TWR AND EXPLAINED CAREFULLY WHAT HAD HAPPENED; RPTED THAT THERE HAD BEEN NO DAMAGE TO THE ACFT OR PAX. I THEN RETURNED TO GED. THE FLT AND LNDG WERE WITHOUT INCIDENT. I PAID CAREFUL ATTN TO KEEP OFF THE BRAKES UNTIL I HAD SLOWED DOWN QUITE CONSIDERABLY. I THEN RETURNED TO GAI; AND AGAIN LANDED WITHOUT INCIDENT; KEEPING OFF THE BRAKES AS LONG AS POSSIBLE. THAT DAY; I RPTED THE INCIDENT TO THE UNICOM ATTENDANT; AND; AS SOON AS POSSIBLE (2 DAYS LATER -- THE FOLLOWING MONDAY) RPTED WHAT HAD HAPPENED TO THE CHIEF INSTRUCTOR AT GAI. I SUGGESTED THAT THE PLANE BE GNDED AND THE BRAKES INSPECTED CAREFULLY. I HAVE NO IDEA WHY THE R BRAKE LOCKED UP LIKE THIS. I THINK THAT TRYING TO MAINTAIN CTL OF THE ACFT; WITHOUT PANIC; AND RESPONDING CALMLY TO THE INCIDENT CONTRIBUTED TO THE LACK OF DAMAGE TO BOTH ACFT AND PAX.