Affected vehicles: 2006 Chevrolet Kodiak, T-Series; 2006 GMC Topkick, T-Series; 2006 Isuzu FVR, FXR 7500/8500 Series with Air Brakes

Situation: Certain affected vehicles fail to conform to Federal/Canada Motor Vehicle Safety Standard 121, Air Brake System. The brake systems on these vehicles have a check valve that, at times, may not seat properly, creating an internal air leak. This leakage can cause a delay in the application of the spring brakes when the operator pulls the dash valve button. If the vehicle is on an uneven surface, it could result in unintended vehicle movement and a possible vehicle crash. This condition does not affect normal service braking.

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