One problem related to power assist brake vacuum has been reported for the 2003 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Hyundai Sonata based on all problems reported for the 2003 Sonata.
At a stop light when consumer put his foot on the brake, the brake pedal went to the floor. This occurred at least four times. The first time when this happened vehicle had less than 200 miles on it. Dealer informed the consumer that there was lost of vacuum to the power booster. The cause was a blockage in the vacuum hose. The manufacturer was informed of the problem.