One problem related to brake sensor has been reported for the 2004 Buick Lesabre. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Buick Lesabre based on all problems reported for the 2004 Lesabre.
Front calipers do not fully engage and the "check stability control" warning occurs, making turning/braking rather challenging. It seems to occur random. It does need the steering wheel position sensor and not sure if the sensor is causing this issues as well. This has occurred several times, but not enough for a definitive pattern.