THERE WAS CONFUSION INTERPRETING THE VARIOUS BRAKING ACTION MEASURING DEVICES AS TO WHETHER THE BRAKING ACTION WAS GOOD OR POOR.

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ARRIVED YYZ GATE AND GOT PAPERWORK. PLANE FULL AND PRELIMINARY TKOF WT ARRIVED ACFT AT YYZ. SNOWED ALL MORNING. PRELIMINARY TKOF WT 145700 LBS. CHKED ARPT RPT; ATIS; AND GND CTL. FIELD CONDITIONS RPTED JAMES BRAKE INDICATOR (JBI) OF .31 AND .41 WITH 1 INCH OF SNOW ON RWY. QUICK CHK SHOWED THAT I NEEDED CORRECTION TO TKOF DATA. CALLED DISPATCH AND THEY AGREED. TRIED TO STOP FUELING; BUT IT WAS DONE. NEW TKOF PERFORMANCE SYS SHOWED 129000 LBS WT AND THEY DECIDED TO DEFUEL AND GO TO BNA OR CMH. GATE MGR CAME UP AND STATED THAT LNDG ACFT SAID BRAKING GOOD. I STATED THAT JBI OF .41 ON RWY 24R WITH SNOW OF 1 INCH WAS RPTED. THE LATEST QUOTE FIELD RPT. GATE MGR SAID IT SHOWED GOOD BRAKING ACTION RPTED BY ARPT AUTH. I TOLD COPLT TO CHK WITH GND AS I READ THE RPT. IT AGAIN SHOWED .41 ON THE RPT. IT WAS JBI; NOT MUMETER (MU). .40 MU IS GOOD; .41 JBI IS POOR. I SAID THAT I COULD NOT TKOF WITH .41 JBI; THIS DIFFERENCE NEEDS TO BE ADDRESSED. JBI IS AVERAGE BRAKING ON WHOLE RWY. IF BRAKING IS GOOD ON LNDG ROLL; THEN THE DEP END WOULD BE VERY BAD TO GET A JBI AVERAGE OF .41. I THEN WENT OUT TO RWY AND CHKED IT WITH THE ARPT AUTH. BY NOW RWY 24R WAS BRUSHED CLEAN. BRAKING GOOD. REFUELED; AND DEPARTED TO DFW. CONFUSION BY THE GATE MGR ON DIFFERENCE OF JBI AND MU SHOULD BE LOOKED INTO. JBI AVERAGE NEEDS TO BE EXPLAINED TO ALL THAT LOW JBI AVERAGE WITH GOOD BRAKING ON LNDG COULD MEAN VERY POOR BRAKING ON REST OF RWY. ALSO; ACFT DIFFERENCE SHOULD BE EXPLAINED TO GATE MGR AND STAFF OF ALL ARPTS. ALSO NEED TO EXPLAIN THAT TKOF PENALTIES ARE FOR STOPPING SAFELY AND SUCCESSFULLY; NOT TAKING OFF.