One problem related to brake foundation components has been reported for the 2005 Chevrolet Trailblazer. The most recently reported issues are listed below.
2005 chevy Trailblazer braking system failure. . . During normal driving without any indication the brake pedal will go to the floor when depressed and the brakes are not applied. . . After several pumps (7-10)the pedal comes back and the braking system starts working again. This is the second braking failure event of this type for this vehicle. After the first event the dealership replaced the master cylinder, claiming the master cylinder leaked.