One problem related to brake master cylinder has been reported for the 2003 Cadillac Deville. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Cadillac Deville based on all problems reported for the 2003 Deville.
Brake pedal goes down to the floor. Dealer changed the master cylinder, but brake pedal still goes down to the floor.