CITATION CE551 PLT HAS A RWY EXCURSION DUE TO BRAKE MALFUNCTION.

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I WAS RETURNING THE ACFT TO OUR HOME BASE C65. I RECEIVED THE CURRENT AWOS FROM SBN GIVING THE WINDS 340 DEGS AT 15 KTS AND GUSTING AND ELECTED TO LAND ON RWY 28 AT C65. BEING FAMILIAR WITH THE LCL PROB OF ERRATIC WINDSHEAR EFFECT FROM TALL TREES PARALLELING THE RWY; I CHOSE VREF +10 KTS FOR MY APCH SPD AS I HAD MANY TIMES BEFORE. AS I TOUCHED DOWN I ENCOUNTERED A POSITIVE RATHER THAN THE ANTICIPATED NEGATIVE WINDSHEAR. DUE TO THE ERRATIC XCTLING REQUIRED BY THE GUSTING XWIND CONDITIONS; I WAS SLOW TO ACTIVATE THE SPD BRAKES. THIS; AND THE FACT THAT I WAS WITHOUT PAX; NOT MUCH FUEL; AND THE +10 KTS REF SPD; CAUSED THE REVERSERS TO BE SLOW IN DEPLOYING DUE TO THE MAIN GEAR CTLING SQUAT SWITCH NOT BEING ACTIVATED. AS SOON AS THE REVERSERS DEPLOYED; I APPLIED THE BRAKES TO USE DIFFERENTIAL BRAKING TO HELP STABILIZE THE LNDG ROLL AND FOUND THAT THE PEDALS WERE UP HARD; BUT THAT I HAD NO BRAKING EFFECT AT ALL! AS I WAS STILL XCTLING; AND WITH REVERSE ACTIVATED; I TRIED TO HOLD THE ACFT ON THE CTR OF THE RWY. I THEN REACHED FOR THE EMER BRAKE HANDLE; LEAVING CTL OF THE REVERSERS; AND STARTED A SMOOTH PULL ON THE HANDLE. THE ACFT STARTED TO DART TO THE L; SO I HAD TO RELEASE THE BRAKE HANDLE AND GO BACK TO THE REVERSERS FOR CTRLINE CTL. JUST ABOUT THE TIME I HAD THE ACFT STABILIZED ON CTRLINE; I RAN OUT OF THE 4100 FT RWY PAVEMENT ONTO THE GRASS FOR ABOUT 100 FT AND STOPPED. AFTER REVIEWING THIS COMPLETE OCCURRENCE; I HAVE LEARNED VERY MUCH AND I THINK I HAVE DISCOVERED SOME OPERATIONAL AND SAFETY HAZARDS THAT NEED TO BE EXPLORED. 1) UPON LOOKING FOR THE CAUSE OF THE LOSS OF BRAKING; MAINT HAS FOUND THAT THE ANTISKID SENSORS WERE SEVERELY CORRODED AND IN ALMOST 30 YRS HAD NOT BEEN OVERHAULED. WHEN THE SENSOR WIRING CONNECTORS WERE BEING REMOVED; THE WIRES BROKE IN TWO AT THE PLUGS AND THE CONNECTORS THEMSELVES WERE ALSO SEVERELY CORRODED. 2) WHEN THE ANTISKID SENSORS ARE NOT OPERATING NORMALLY; THE SENSORS TELL THE HYD BRAKING SYS THERE IS A SKIDDING WHEEL AND AUTOMATICALLY RELEASE THE BRAKE HYD PRESSURE WHICH RESULTS IN THE FULLY HARD BRAKE PEDAL WITH NO BRAKING EFFECT I EXPERIENCED. 3) THE CURRENT C-551 CHKLIST EMER/ABNORMAL PROCS UNDER 'WHEEL BRAKE FAILURE' HAS TWO MEMORY ITEMS ONLY. 'REMOVE FEET FROM PEDALS' AND 'PULL EMER BRAKE HANDLE AS REQUIRED.' NOTHING ABOUT SELECTING ANTISKID OFF. 4) IN ALL MY YRS OF RECURRENT TRAINING; I HAVE NEVER BEEN BRIEFED ON ANY BRAKE FAILURES DUE TO ANTISKID PROBS OR ANY SIMULATOR SCENARIOS RELATING TO ANYTHING BUT HYD BRAKE FAILURES. 5) IN REVIEW OF THE CESSNA CITATION TECHNICAL MANUAL THERE IS NO MENTION OF A BRAKE FAILURE WITH ANTISKID 'ON' AND A SEQUENCE GIVEN FOR SWITCHING ANTISKID 'OFF' AND REGAINING NORMAL BRAKE OP.