One problem related to power assist brake hoses, lines/piping, and fittings has been reported for the 1999 Chevrolet Blazer. The most recently reported issues are listed below.
While driving I had a complete brake failure on my 1999 Chevrolet Blazer the "brake pressure moudulation brake pipe" let go without warning. The brake warning light came on as the brake pedal went to the floor. The dealer has had my car since 12/22/04 and has been unable to get the part to repair the car.