AGC CTLR CONCERNED WITH BRITE RADAR OUTAGE WHEN ENCOUNTERING ACFT SEQUENCING PROBS FROM PIT TRACON.

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AGC HAS BEEN EXPERIENCING TWR BRITE RADAR OUTAGES NUMEROUS TIMES DURING THE LAST 3 MONTHS. WORKING WITHOUT A RADAR INCREASES CTLR WORKLOAD AT AGC AND PIT TWR (THEY RUN OUR IFR APCHS). AT THE TIME OF THE INCIDENT; AGC RADAR WAS OTS. PIT IS REQUIRED TO CALL IFR INBOUND ACFT. THEY CALLED IN A LEARJET ON A VISUAL APCH FROM THE SW OF THE ARPT. MEANWHILE; I HAD A C414 ON L DOWNWIND RWY 28 AND A BE35 ON R DOWNWIND RWY 2 SEQUENCED #2 BEHIND THE C414. THE LEARJET RPTED ON MY FREQ AND I INSTRUCTED HIM TO RPT A MIDFIELD L DOWNWIND. THE LEARJET INFORMED ME THAT WOULD BE HARD TO DO SINCE HE WAS DUE E OF THE ARPT. I ASKED HOW FAR OUT. HE REPLIED 4 MI. I IMMEDIATELY TOLD HIM TO REDUCE SPD AND SEQUENCED HIM #3 BEHIND A BE35 NOW ON ABOUT A 2 1/2 MI FINAL. THE LEARJET DID NOT SEE THE BE35 AND I OBSERVED OUT THE WINDOW THAT THIS WAS NOT GOING TO WORK. I IMMEDIATELY COORDINATED WITH PIT TO BREAK THE LEARJET OUT TO THE N AND PUT THE LEARJET BACK ON PIT'S FREQ TO BRING HIM BACK FOR ANOTHER APCH. AT THIS POINT; I ESTIMATE THE JET LESS THAN 1 MI BEHIND THE BE35. CONTRIBUTING FACTORS: 1) TWR BRITE RADAR OTS. BELIEVE IT OR NOT; VFR TWRS USE OUR RADAR DISPLAYS TO AID SEQUENCING AND FOR SAFETY ADVISORIES. IF RADAR WAS WORKING; I WOULD HAVE KNOWN EXACTLY WHERE THE LEARJET WAS AND COULD HAVE SEQUENCED THE BE35 #3 BEHIND THE LEARJET. 2) PIT APCH ERRONEOUSLY CALLING IN THE DIRECTION OF THE VISUAL APCH. IF I HAD KNOWN THE LEAR'S POS; ONCE AGAIN I COULD HAVE CHANGED THE SEQUENCE BY NOT ALLOWING THE BE35 TO TURN BASE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT ONE KNOWN PROB WAS RESOLVED WITHIN THE LAST 2 WKS. THE BRITE MICROWAVE LINK WAS REPAIRED AND THE EQUIP WAS RETURNED TO SVC. ANOTHER PROB; YET TO BE VALIDATED DUE TO THE MICROWAVE RESOLUTION; IS ONE ASSOCIATED DUE TO PWR FLUCTUATIONS. IT WAS RPTED TO THE WORK FORCE; THAT A POTENTIAL PROB EXISTS WHEN A LOAD IS APPLIED THROUGH THE ELECTRICAL PWR SYS WHEN THE LCL SHOPPING MALL; ON THE ADJOINING PROPERTY; UTILIZES FULL ELECTRICAL CAPABILITY -- BASICALLY ALL AIR CONDITIONERS ARE ON. THE RPTR STATES THAT THE BRITE; AND ASSOCIATED EQUIP; BECOMES UNRELIABLE BECAUSE OF A LACK OF UNIFORM PWR. THE RPTR IS AWARE OF MULTIPLE SUBMITTED UCR'S.