At a glance
What can fail
A control valve in the air brake system has an improperly configured internal check valve that blocks normal air flow. During emergency braking, this prevents the brakes from working as designed, increasing stopping distance.
What the fix does
Dealers will replace the air brake application valve assembly on C-Series trucks or reroute air brake lines on T-Series trucks at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.