How long should new brake pads be “bed-in”?

Standard brake pads should be bed-in for at least 300 km, not braking sharply but rather progressively and softly. In pads where scorching (heat treatment of the friction material) is used, bed-in is not necessary as this process eliminates the fading phase, i.e. the loss of effectiveness when the brakes are hot.

Are there sport versions of brake pads?

Yes, but they should not be used in commercial vehicles. These pads have completely different properties, primarily due to the extremely high disc temperatures generated by the frictional force. Such pads are manufactured specifically for this type of competition, they are softer and adapted precisely to high temperatures, so they wear out very quickly.