At a glance
What can fail
The air suspension control valve supply line lacks a pressure protection valve. If an air suspension bag fails, the front axle brake system loses air pressure, which can disable front brakes and lengthen stopping distance.
What the fix does
An air pressure protection valve will be installed in the supply line to prevent pressure loss to the front axle brakes.
Summarized — see the official notice for exact wording, dates, and contacts.