At a glance
What can fail
The vacuum hose connected to the brake booster may not be properly installed. If it becomes disconnected, the engine idle speed increases and the power-assisted braking system stops working without warning.
What the fix does
Dealers will fully seat and clamp the vacuum hose connection to the brake booster's vacuum check valve nipple.
Summarized — see the official notice for exact wording, dates, and contacts.