As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI BRAKE CHECK, LEFT BRAKE GRABS SEVERELY AND PULLS AIRCRAFT LEFT ON BOTH SIDES (PILOT AND COPILOT). NO LEAKS FOUND AROUND BRAKE ASSEMBLY. NO LEAKS FOUND AROUND BRAKE ASSY. REMOVED BROKEN LT BRAKE VALVE LEVER RETURN SPRING AND INSTALLED A NEW SPRING. PERFORMED TAXI CHECK WITH NO DEFECTS NOTED, REF AMM 32-40-00.