Which of these is NOT an advantage of disc brakes over drum brakes?

Disc brakes are known for several advantages over drum brakes, particularly in terms of performance under various conditions. One of the main benefits is better heat dissipation. Disc brakes are designed to allow air to circulate around the braking surface, which helps to reduce the heat generated during braking. This high heat dissipation capability also leads to better fade resistance, meaning that disc brakes maintain their performance better under heavy or prolonged braking compared to drum brakes, which can experience brake fade when they overheat.

Self-adjust capabilities are another feature inherent to some drum brakes, where they can adjust automatically to shoe wear. However, this feature is not present in disc brakes, as they rely on different mechanisms for wear adjustment.

While water resistance might be relevant in certain contexts, drum brakes can actually retain water when wet, compared to the effective drainage characteristics of disc brakes. Therefore, stating that improved water resistance is an advantage of disc brakes misses the mark, as it is actually a characteristic where drum brakes can sometimes perform better. Hence, the correct stance is that improved water resistance is not an advantage of disc brakes over drum brakes.