What was found
WHEN STOPPING THE ACFT ON THE RAMP BOTH MAIN GEAR BRAKES GROWL & GRAB WHEN MAKING A COMPLETE STOP. TAXIED ACFT FOUND LT & RT BRAKE GROWLING AT VERY SLOW SPEEDS. JACKED ACFT & REMOVED ALL FOUR MAIN WHEEL ASSEMBLIES, REMOVED ALL BEARINGS & CLEANED BEARINGS. CLEANED DEBRIS FROM ALL BRAKE ASSEMBLIES & BRAKE STACKS. BLED ALL BRAKE ASSEMBLIES, NOTED ONLY A SMALL AMOUNT OF AIR WITH EACH BRAKE ASSEMBLY. WHEN BLEEDING COMPLETED SET BRAKES, OPS & LEAK CHECKED GOOD. REPLACED ALL BEARINGS & INSTALLED ALL MAIN WHEELS. WORK DONE IAW MM 32-42-10. TAXI CHECKED ACFT BRAKE OPS CHECK & LEAK CHECKED GOOD.