It is clear from the passage that one of the functions of an aircraft's landing-wheel brakes is to ----.

Aircraft landing-wheel brakes are fitted to all sizes of
aircraft for arresting motion after touch-down, for
steering during taxiing by differential control of port
and starboard brakes, and to hold the aircraft
stationary while the engine is warmed-up or tested.
Small aircraft have simple two-shoe internal
expanding brakes manually operated and very similar
to the standard road-vehicle brake, but the larger
machines require power-operated brakes using
compressed air or hydraulic pressure from
compressors or pumps driven by the engine. Besides
being as light and compact as possible, landing-wheel
brakes must remain effective and balanced during
very high rates of energy dissipation due to the great
weight of the aircraft and the very high landing
speeds.