One problem related to brake foundation components has been reported for the 1999 Buick Lesabre. The most recently reported issues are listed below.
Was driving on a steep hill & had foot on brakes. When foot was taken off brakes, vehicle rolled backwards. Took to dealership. Informed by mechanic brakes were designed like that. Currently, while driving on a hill would have one foot on brakes & the other foot on accelerator.