Three problems related to brake master cylinder have been reported for the 2003 Chevrolet Avalanche. The most recently reported issues are listed below.
Primary master cylinder brake line burst lost brakes.
Brake line explosive failure before the firewall. 95% loss of stopping power. Inspection of lines indicates corrosion. Also heavy corrosion on frame members noted. This vehicle has been in the chevy dealership several times for corrosion of the brake rotors. At 25000 mi. Replaced all rotors and pads with non chevy parts. No more rotor issues. Now all brake lines changed due to corrosion and burst line has caused a master cylinder failure. There are serious safety issues here and it's time for NHTSA to step in.
The contact owns a 2003 Chevrolet Avalanche 1500. The contact stated that when braking, the rear brake would seize and began to smoke. The brake pads were replced by a local mechanic and the brake booster and master cylinder was replaced three times. The repair did not correct the failure and the rear brake continued to seize and smoke. The vehicle was not repaired. The manufactured was contacted and advised that the VIN was not included in any recalls. The failure mileage was 120,000 and the current mileage was 133,000.