What was found
POWER BRAKE CB: REPEAT WRITEUP; PWR BRKS CB POPPED AT 500' AGL ON APPROACH. PREVIOUS WRITEUP INDICATES THE SAME CB POPPED ON THE GROUND A DAY EARLIER. BOTH INCIDENTS OCCURRED AFTER POWER HAD BEEN ON THE AIRCRAFT FOR AT LEAST AN HOUR. CB WAS RESET FOR LANDING AT DIVERT AIRPORT. // SIGNOFF // VISUALLY INSPECTED PNUEMATIC BRAKE BOTTLE AND WAS FOUND TO BE FULL. REMOVED UNSERVICEABLE BRAKE PUMP MOTOR PN MP50B-L SN 3666. INSTALLED AN OVERHAULED BRAKE PUMP MOTOR PN MP50B-J SN 4844. OPERATIONAL CHECK WAS FOUND TO BE SATISFACTORY. ACCOMPLISHED REF: CE560XL MM 32-42-06.