The official notice
Defect
On certain trucks equipped with a 3.5 L Ecoboost engine, brake fluid could leak from the brake master cylinder into the brake booster. This can cause reduced front brake performance, and the driver may experience increased brake pedal travel and increased pedal effort. Full braking function remains in the rear wheel circuit. Note: Depending on the amount of brake fluid loss, the driver may hear a warning chime and see a red brake warning indicator in the instrument cluster. This is an expansion of Ford recall 20S31 (Transport Canada Recall No. 2020-252).
Safety Risk
Reduced front brake performance can cause extended stopping distances and increase the risk of a crash.
Remedy
Ford will notify owners by mail and instruct you to take your truck to a dealer to replace the brake master cylinder. The dealer will also replace the brake booster if the brake master cylinder is leaking.