C402 PLT ROLLED OFF THE RWY END AFTER DISCOVERING THE ACFT BRAKES WOULD NOT WORK.

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ON DEC/SUN/2001 I WAS FLING ACFT X; A CESSNA 402C ACFT WITH 6 PAX FROM (MYAT) TREASURE CAY; BAHAMAS; TO (FXE) FT LAUDERDALE EXECUTIVE ARPT. A FULL PREFLT AND RUN UP WAS ACCOMPLISHED BY ME WITH ALL SYS CHECK. THE FLT DEPARTED MYAT AT XA45 WITH AN ETA INTO KFXE AT XB40. A LCL VFR FLT PLAN WAS FILED AND UTILIZED WHICH CALLED FOR A CRUISE ALT OF 8500 FT. ENRTE AND ABOUT HALF WAY TO MY DEST I NOTICED A CONSIDERABLE AMOUNT OF OIL COMING FROM THE LEFT ENG. THE ENG INSTS WERE MONITORED AND SHOWED NORMAL OPS RANGES. THE CONCERN I HAD WAS THAT THE OIL LOSS WAS DUE TO A CYLINDER WHICH HAD JUST BEEN REPLACED. CONTINUING THE FLT AS ALL ENG INSTS WERE STILL OPERATING IN THEIR RESPECTIVE GREEN ARC; I ENTERED A LEFT DOWNWIND ON RWY 8 AS ADVISED BY TWR CTL AT FXE. A NORMAL LNDG FOLLOWED WITH A PLANNED A ROLLOUT ONTO D TXWY. FXE TWR REQUESTED ME TO TURN OFF AT C TXWY AS I WAS PASSING IT AND PROMPTLY RESPONDED 'UNABLE.' CTLR TWR THEN REQUESTED I EXPEDITE MY TURN OFF. AT THIS POINT I ADDED PWR TO ACCELERATE TO D TXWY HOWEVER THE BRAKES DID NOT RESPOND. ATTEMPTING TO PUMP THE BRAKES TO TRY AND REGAIN SOME BRAKING ACTON FAILED SO ELECTED TO ROLL OFF THE END OF THE RWY. AS THERE WERE NO OBSTACLES; I KEPT THE ENGS RUNNING AND TRIED TO TAXI THE AIRPLANE IN THE SANDY OVERRUN BACK ONTO THE TXWY. SOFT FIELD TECHNIQUE WAS USED HOWEVER THE LEFT SIDE BRAKE ON MAIN GEAR LOCKED UP AT WHICH POINT THE ACFT WAS IMMOBILE. THE ACFT WAS THEN SHUT DOWN. NO INJURIES WERE SUSTAINED AND I RADIOED FOR ASSISTANCE. SECURITY RESPONDED AT XC00 AND FBO X WAS PHONED AT XC15 FOR AN ACFT TOW. I WAS DRIVEN TO CUSTOMS BY SECURITY PERSONNEL AND CLRED ALL PAX AT XC20. FBO X ARRIVED AT XC30 AND THE ACFT WAS TOWED TO ACR X HANGAR BY XA45. SECURITY FOLLOWED TO COMPLETE THE PAPERWORK WITH ME. ARPT OPS ARRIVED TO INVESTIGATE. OIL LEAKAGE FROM THE ENG APPEARED TO HAVE COVERED THE ENG COWLING TOP TO BOTTOM AND IN SO DOING GOT ON THE DISC BRAKE ON LEFT SIDE. BRAKING TO BE NILL. COUPLED WITH A REQUEST BY THE CTLR TWR TO EXPEDITE CAUSED A TURN OFF THE RWY AFTER SPDING UP IMPOSSIBLE. OIL LEAKAGE ON THE TXWY WAS PREVENTED DURING THE TOW BY SAND ADHERING TO UNDERSIDE OF ENG COWLING. FXE OPS REQUESTED A VISUAL INSPECTION OF RWY AND TXWYS. THE ACFT WAS SECURED AND PARKED AT THE ACR X HANGAR. WHAT COULD HAVE BEEN DONE TO PREVENT THIS: CTL TWR GIVEN MORE SPACING; AND DON'T HAVE GASKETS OR SEALS THAT CAUSE LEAKS.