One problem related to brake master cylinder has been reported for the 2003 Honda Civic. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Honda Civic based on all problems reported for the 2003 Civic.
After refueling and pulling away from a gas station, brakes went almost to floor and car felt like it would not stop. Repeated pumping of brakes restored some braking power. However, after stopping, brakes went almost to floor again. Dealer could not detect problem on first test drive; however brakes failed on second test drive. Invoice for repair says "brake master cylinder leaking (into brake booster). Replaced brake master cylinder and flushed brake fluid". Old master cylinder available.