DURING TAXI THE BRAKES AND NOSE STEERING FAILED FOR A FAZO. ACFT STRUCK A PARKED C172. CAUSE OF BRAKE AND NOSE STEERING FAILURE UNKNOWN.

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ON JUL/THU/04; RAMP PULLED ACFT X OUT OF THE HANGAR AND PUT IT ON THE RAMP SO I COULD DO A LEAK CHK OF HYD PUMP AND TAXI THE ACFT TO THE COMPASS ROSE TO DO A COMPASS CHK. I STARTED THE #2 ENG AND RAN IT AT IDLE FOR ABOUT 10 MINS WHILE MR X DID THE LEAK CHK. I SAT IN THE L SEAT AND HELD THE BRAKES AND ADVANCED THE THROTTLE TO ABOUT 45% N; RPM FOR ABOUT 10-15 SECONDS. AFTER ABOUT 5 MORE MINS OF THE ACFT RUNNING AT IDLE I HAD MR X SIT IN THE R SEAT AND HOLD THE BRAKES WITH THE #2 ENG AT IDLE SO I COULD CLOSE THE DOOR. AFTER I CLOSED THE DOOR; I BEGAN TO TAXI; I TOOK MY FEET OFF OF THE BRAKES AND SLIGHTLY MOVED THE THROTTLE AS SOON AS I FELT THE ACFT MOVE SLIGHTLY (ROLL). I DID A BRAKE CHK; AGAIN; R/L BRAKE LIGHTS CAME ON AND I FELT THE ACFT STOP. I BUMPED THE THROTTLE UP VERY SLIGHTLY UNTIL IT AGAIN BEGAN TO ROLL; THEN I PULLED THE THROTTLE BACK TO IDLE AND TRIED TO TURN THE ACFT. IT DID NOT RESPOND SO I APPLIED THE BRAKES; BUT IT STILL DID NOT STOP. BY THE TIME I PULLED THE EMER BRAKE WE HAD ALREADY HIT THE C172; I THEN SHUT DOWN THE ENG AND APU.