As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT AT FIRST BRAKE APPLICATION NOTICED SIGNIFICANT BRAKE SHUDDER USING BOTH PEDALS. ADDITIONAL BRAKE APPLICATIONS ON THE TAXI OUT REVEALED SHUDDER COMING FROM BOTH PEDALS HOWEVER THE RIGHT PEDAL PRODUCED A MUCH MORE SIGNIFICANT SHUDDER. SERVICED HYDRAULIC RESERVOIR. OPS CHECK GOOD. IAW AMM 32-40-00-870-801A