LTT PLT LANDS ON SNOW COVERED RWY WITH BRAKING ACTION RPTED POOR TO NIL.

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WHILE ON FINAL APCH TO RWY 34 AT BINGHAMTON; NY; (WX 2200 OVCST 1 1/2 MI SNOW; EXECUTING ILS APCH) ACFT AHEAD (SMT) BY 4-5 MI LANDED AND RPTED BRAKING ACTION POOR TO NIL. I HAD NEVER HEARD ANYONE RPT BRAKING ACTION THAT WAY (FAIR TO GOOD; FAIR TO POOR) BUT NEVER POOR TO NIL. MOST PLTS KNOW IF YOU RPT IT AS NIL YOU SHUT THE ARPT DOWN. COMPANY PROCS FORBID OPS ON NIL BRAKING ACTION. BECAUSE HE RPTED POOR TO NIL NOT ONE OR THE OTHER; I DECIDED TO AVERAGE THE POOR TO NIL AND CAME UP WITH SOMETHING BETTER THAN NIL LESS THAN POOR. I LANDED; FOUND BRAKING ACTION POOR; RPTED IT AS SUCH. TWR HAD VEHICLE GO OUT ON RWY AND TRUCK RPTED BRAKING ACTION AS POOR. HINDSIGHT. SHOULD HAVE MADE MISSED APCH. REQUESTED HOLDING OR VECTORS AND ASKED TWR TO GET A VEHICLE TO CHK RWY SO THE OFFICIAL BRAKING ACTION WOULD BE DETERMINED TO BE ONE OR THE OTHER (NIL OR POOR). I AM IN VIOLATION OF MY COMPANY'S OPS MANUAL. IT STATES ANY BRAKING ACTION RPT THAT CONTAINS WORD 'NIL' WILL NOT BE OPERATED ON. I THOUGHT IT SAID SOMETHING TO THE EFFECT OF ABSOLUTELY NIL. I WAS WRONG. NEXT TIME I WILL GAR; HAVE THE ARPT MGR MAKE THE DECISION; NOT ME; ON A 2 MI FINAL.