Wheel brake for a drum-braked vehicle and expander device for a drum brake

The wheel brake has a brake drum (3) and two brake shoes (2A,2B), where a drive member is movable over a movement section, as well as over a replacement arranged in an extension of the movement section. One or more form-fit locking elements are engaged on the movement section, and are also engaged at the elongated movement section. An overload clutch is arranged between a drive member and an adjusting element. Independent claims are included for the following: (1) a method for adjusting the air play at a wheel brake of a drum-braked vehicle; and (2) an expanding lock for a drum brake.