Read the following passage:
Glycol-based automotive brake fluids are inherently hygroscopic, meaning they steadily absorb moisture from atmospheric humidity through microscopic pores in flexible rubber hoses and reservoir seals. Over time, accumulated water substantially lowers the fluid's boiling temperature. Under sustained braking, intense frictional heat migrates from the brake calipers into the hydraulic lines. If degraded fluid exceeds its reduced boiling threshold, the dissolved water vaporizes into compressible gas pockets. This condition, known as vapor lock, prevents hydraulic pressure from acting on the friction pads, leading to a sudden failure of braking effectiveness.
According to the passage, the infiltration of atmospheric moisture into brake fluid decreases the temperature required for the liquid to transform into gas.
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