One problem related to power assist brake vacuum hoses, lines/piping, and fittings has been reported for the 2002 GMC Envoy. The most recently reported issues are listed below.
While operating vehicle at about 75 mph in fast lane vehicle lost power, almost causing an accident. Loss of engine power/ steering power, and once vehicle came to a stop. Dashboard illumination showed brake check valve defect.
| Brake Disc Rotor problems | |
| Brake Electric Antilock problems | |
| Brakes Failed problems | |
| Service Brakes problems | |
| Brake Disc Pads problems | |
| Brake Light On problems | |
| Power Assist Brake Vacuum Hoses, Lines/piping, And Fittings problems | |
| Brake Abs Warning Light problems | |
| Brake Drum problems | |
| Abs Brake Fail problems | |
| Brake Differential Proportional Valve problems | |
| Brake Grinding Noise problems |