One problem related to brake hoses, lines/piping, and fittings has been reported for the 2003 Ford Explorer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Explorer based on all problems reported for the 2003 Explorer.
The rear air conditioner line rubbed against the brake line causing brake line failure. The rupture occurred during an attempt to suddenly stop. There were no signs of rust either inside or outside the brake line. The failure occurred at about 156,000 miles on the vehicle. Oddly enough, the mechanic specifically noted that rust was not a factor in this case as is common on many newer vehicles. I have owned the vehicle since 3/7/2006. No collision work has been performed on the vehicle since taking ownership.