What factors influence brake temperature during and after landing, and what are consequences of overheating?

• A. High braking loads, high speeds, and repeated landings raise temperature; overheating can cause brake fade, reduced efficiency, and structural damage.
• B. Only high speeds affect temperature; overheating increases braking efficiency.
• C. Temperature is constant; overheating only causes paint damage.
• D. Weather conditions solely influence temperature; overheating leads to wear but no performance loss.

Answer: (A)

Braking temperature is determined by the energy the braking system must absorb, which comes from the aircraft’s kinetic energy at touchdown. The hotter the brakes get, the more heat they must shed. This heat load depends on how hard you brake (braking loads), how fast you land (high speeds), and how many landings or braking events occur in quick succession (repeated landings). High speeds mean more energy to dissipate per braking event, and multiple hard landings give less time for cooling between events, so heat builds up. After touchdown, cooling helps as the wheels spin and air flows around the brakes, but if you’ve had heavy braking at high speed on a hot day or with several landings in a row, cooling may not keep up, leading to higher temperatures.

Overheating can cause brake fade, where friction drops because the pad and disc materials degrade or gases form, making braking less effective. This reduces braking efficiency and can increase stopping distance. In extreme cases, overheating can damage components—things like warped or cracked discs and worn seals or hardware—shortening brake life and potentially compromising performance. Weather and cooling effects matter, but the main concern is the combination of high braking loads, high speeds, and repeated braking events driving temperatures up and leading to these issues.