What would be a cause for brake failure while driving down a steep hill?

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Braking consistently without rest is a significant cause of brake failure when driving down a steep hill. When a driver engages the brakes continuously, especially on a steep incline, the brakes can become overheated due to the excessive friction generated. This overheating can lead to a reduction in braking power, often referred to as "brake fade." Brake fade occurs when the brake components do not cool down adequately because of prolonged use, leading to diminished braking effectiveness, which can be dangerous in steep driving situations.

By allowing the brakes to rest intermittently and using engine braking techniques, drivers can help prevent overheating and maintain better control of the vehicle while descending hills. This practice ensures that the braking system remains effective and reduces the risk of failure due to heat buildup.