what would cause brakes no a 1991 nissan maxima to grab and lock on 1991 Nissan Maxima

brakes locking up

Asked by for the 1991 Nissan Maxima
Front brakes are disc brakes, the rear are drum brakes. Oil or contamination on the brake linings will cause the brakes to act less inefficiently and will cause "pulling", needs to have all for brakes inspected to determine what's wrong.