As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAINS LEFT BRAKE GOES TO FLOOR AND WON'T STOP THE AIRCRAFT. WHEN PUMPED IT WILL GRAB BUT FADES TO THE FLOOR QUICKLY AND FAILS TO STOP OR SLOW THE LEFT WHEEL PROPLEM OCCURS ON TAXI AND LANDING. TROUBLESHOT THE SYSTEM REPLACED THE RIGID HYDRAULIC LINES FROM ZONE NR 1 TO ZONE NR 5 IAW THE ATR42 AMM 20-23-13. THE SYSTEM LEAK CHECKED GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.