What was found
DURING TAXI OUT, AIRCRAFT BRAKING SYSTEM BEGAN TO SHUDDER. NOTICEABLE IN BOTH LEFT AND RIGHT BRAKES, HOWEVER THE RIGHT SIDE WAS MUCH MORE EXTREME. NO CAS MESSAGES WERE DISPLAYED. NO ABNORMALITIES WERE NOTED ON POST FLIGHT VISUAL INSPECTION. PERFORMED BLEEDING OF THE MAIN AND EMERGENCY BRAKE SYSTEM. REMOVED AND REPLACED BRAKE CONTROL UNIT. / PERFORMED BRAKE FUNCTIONAL TEST AND OPS AND LEAK CHECKS WITH NO DEFECTS NOTED AT THIS TIME. IAW AMM 32-40-00, 32-41-00 AND 32-41-01. PERFORMED TAXI CHECK TO VERIFY IF THE BRAKE SHUTTER HAS BEEN CORRECTED. TAXI CHECKS ARE GOOD AT THIS TIME. NO SHUDDER OR UNUSUAL NOISES HEARD OR FELT DURING TAXI. IAW AMM 09-20-01.