AN A319 PILOT RECEIVES A BSCU ECAM WARNING AFTER LOWERING THE LANDING GEAR. THE NORMAL AND ALT BRAKES APPEARED NORMAL. A NORMAL LANDING WAS MADE.

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PROB WITH BRAKE SYS/POSSIBLE BSCU ISSUE. ACFT HAD AN MEL FOR THE AUTOBRAKE SYS INOP. NO ACTION ITEMS REQUIRED; EXCEPT FOR SPECIAL CONSIDERATION LISTED WHEN DOING THE TKOF CONFIGN TEST DURING TAXI OUT (PRIOR TO TKOF). ROUTINE FLT UNTIL WE EXTENDED THE LNDG GEAR ON RWY 25L APCH INTO ZZZ. WE RECEIVED A CLASS I ECAM FOR AUTOBRAKE SYS INOP. THIS WAS EXPECTED DUE TO THE INSTALLED MEL. HOWEVER; THE LOWER ECAM STATUS PAGE SHOWED THE NORMAL BRAKE SYS UNDER 'INOP SYS.' AFTER A QUICK DISCUSSION WITH MY FO; WE TOLD ZZZ TWR THAT WE NEEDED TO GO AROUND TO EVALUATE A MAINT ISSUE. THERE WAS NO REASON FOR OUR NORMAL BRAKE SYS TO BE INOP; SO I DID NOT FEEL COMFORTABLE CONTINUING FROM THAT POINT. WE WERE SOMEWHERE BTWN 2500-3000 FT MSL WHEN COMMENCING THE GAR. SINCE WE RECEIVED THE BRAKE FAULT(S) UPON SELECTING THE LNDG GEAR DOWN; WE DECIDED TO LEAVE IT DOWN. WE DIDN'T KNOW WHAT WAS GOING ON WITH THE BRAKE SYS AND DIDN'T WANT TO RISK LOSING ANOTHER COMPONENT. FUEL WAS NOT A FACTOR AT THIS POINT. WE HAD DEPARTED ZZZ1 WITH 1500 LBS CONTINGENCY FUEL; PLUS ABOUT 400 LBS MORE THAN THE RELEASE MINIMUM FUEL. ATC VECTORED US ON A VERY WIDE TFC PATTERN. OTHER THAN SOME MINOR CONFUSION ON A HDG ASSIGNMENT; EVERYTHING PROGRESSED SMOOTHLY. THE FO UPDATED THE PAX AND FLT ATTENDANTS WITH A PA AND THEN REACHED MAINT CTL ON VHF2. IN THE MEANTIME; OUR ECAM SYS PAGES SHOWED ALL HYDS NORMAL AND ALTERNATE BRAKES OPERATIONAL (GREEN ON THE 'WHEELS' PAGE). MAINT CTL AGREED THAT THERE WAS ANOTHER ISSUE WITH THE BRAKE SYS BECAUSE MEL'ED AUTOBRAKES SHOULD NOT IN ITSELF AFFECT NORMAL BRAKING. MAINT CTL OFFERED THAT I EXERCISE MY EMER AUTH AND CYCLE THE N/W AND ANTISKID SWITCH TO SEE IF NORMAL BRAKING COULD BE RESTORED. AFTER DISCUSSING IT WITH MY FO; I DECIDED AGAINST DOING THIS. SINCE I KNEW THAT THE ALTERNATE BRAKES WERE OPERATIONAL; I DIDN'T WANT TO RISK ANY FURTHER MALFUNCTIONS. WE WERE EXTREMELY LIGHT (APPROX 111000 LBS AFTER GAR). WE ASKED ATC FOR THE LONGEST RWY. WIND WAS LESS THAN 10 KTS. AFTER CAREFUL EVALUATION; WE DECIDED TO TREAT IT AS A NORMAL LNDG USING THE ALTERNATE BRAKE SYS. I MADE A PA ALERTING THE PAX AND FLT ATTENDANTS THAT OUR PRIMARY BRAKING SYS WAS INOP; BUT THAT OUR 2 BACK-UPS (ALTERNATE AND ACCUMULATOR) WERE FULLY FUNCTIONAL AND THAT WE PLANNED AN 'UNEVENTFUL' LNDG SAFELY IN APPROX 10 MINS.