What was found
MLG BRAKE PRESSURE: TAXIING OUT TO RUNWAY, "ANTISKID" ANNUNCIATOR CAME ON AND SIMULTANEOUSLY THE "PWR BRKS" CIRCUIT BREAKER POPPED. TURNED AIRCRAFT AROUND AND HAD A BRAKE BURNING SMELL AND SHUTDOWN, AND THEN THE "LO BRK PRESS" ANNUCIATOR CAME ON FLASHING. TOWED AIRCRAFT TO RAMP. // SIGNOFF// REMOVED HYDRAULIC BRAKE POWER PACK PUMP, MOTOR, AND PRESSURE SWITCH AND INSTALLED AN OVERHAULED MOTOR ASSY, A NEW HYDRAULIC PUMP ASSY, AND A NEW PRESSURE SWITCH WITH NEW PACKINGS ANO RETAINERS. OPS AND LEAK CHECKS GOOD. DONE I.A.W. CESSNA CE-560XL AMM 32-44-20. NO DEFECTS NOTED. ALSO FLUSHED LEFT ANO RIGHT BRAKE EMERGENCY PNEUMATIC LINE TO CLEAR OF RESIDUAL HYDRAULIC FLUID.