What was found
WHILE TAXING OFF THE RAMP, THE ANTI-SKID INOP ANNUNCIATOR ILLUMINATED, STOPPED ACFT. POWER BRAKE CIRCUIT BREAKER TRIPPED. MINUTES LATER, LOW BRAKE PRESSURE ANNUNCIATOR ILLUMINATED, TOTAL POWER BREAK FAILURE. SHUT ENGS DOWN. R & R POWER BRAKE CB IAW AMM 24-00-00. PERFORMED OPS CHECK IAW AMM 32·42-00. PUMP COMES ON AS SHOULD & CB DOES NOT TRIP. R & R DIODES IAW AMM 24·00-00, PERFORMED OPS CHECK AND AGAIN, PUMP COMES ON & CB DOES NOT TRIP.