FLC SETS TKOF PWR WITH PWR LEVERS. AUTOTHROTTLES ADVANCE PWR ASYMMETRICALLY CAUSING ACFT TO VEER. FLC ABORTS TKOF.

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ON TAKING RWY; ADVANCING AND ACTIVATING AUTOTHROTTLES; ACFT BEGAN TO VEER TO R DUE TO ASYMMETRICAL THRUST. AS I CORRECTED TO L; #2 ENG CAME UP AND THE ACFT VEERED TO THE L. NOT EXTREME; BUT WHEN I GOT ACFT STRAIGHTENED OUT; I FOUND THAT TKOF PWR N1 SETTING HAD NOT BEEN REACHED AND THROTTLES HAD DECLUTCHED. REALIZING THAT I COULD SET PWR MANUALLY; IT ALSO OCCURRED TO ME THAT I DID NOT KNOW HOW MUCH RWY I HAD LEFT. DUE TO CONFUSION; I ABORTED THE TKOF. WAS APPROX 90 KTS; SO AUTOBRAKES ACTIVATED. SHOULD HAVE DISENGAGED THEM FIRST. TOLD TWR IMMEDIATELY. ACFT ON FINAL WENT AROUND. TAXIED TO PAD. GOT A HOT BRAKE LIGHT; CALLED AND CONFERRED WITH MAINT. DECIDED TO GO AGAIN DUE TO PERCEIVED AUTOTHROTTLE PROB. HAD MAINT COME AND CHK #7 WHEEL WHICH WAS OVERHEATING. CHKED CHART AND CONSTRAINTS. TURNED OUT #7 BRAKE TEMP INDICATOR WAS ERRONEOUS; BUT WAITED TILL TEMP CAME DOWN BELOW 150 DEGS TO ATTEMPT TKOF AGAIN. ON NEXT TKOF ROLL; AUTOTHROTTLES CAME UP EVENLY BUT AGAIN DID NOT REACH PRESCRIBED TKOF PWR. SET MANUALLY AND CONTINUED ON TO BOG.