Torque Shop: Hissing noise when using the brakes is not normal and should be rectified immediately

A hissing sound when braking indicates a vacuum leak in your car's brake system, requiring immediate inspection and repair to ...
USA Today

Ford Motor Company - Sudden Loss of Brake Function

Ford Motor Company (Ford) is recalling certain 2025 F-550 SD, F-450 SD, F-350 SD, and F-250 SD vehicles. The brake booster pushrod retaining spring may not have been installed, which can allow the ...