Why does the brake fail after the car wades through water?

1 Answers
AndrewLee
07/30/25 8:11am
When the wheels are immersed in water, a layer of water film forms between the brake pads and the brake discs/drums, reducing friction. Additionally, water inside the brake drums is not easily dispersed. For disc brakes, this braking failure phenomenon is less severe. This is because the brake pads in disc brake systems have a small surface area, and the outer edges of the discs are fully exposed, preventing water retention. Here is additional information: Drum brakes: For drum brakes, after leaving the water, drive while applying the brakes—that is, press the accelerator with your right foot and the brake with your left foot. After pressing several times in succession, the water droplets between the brake pads and the brake drums will be wiped away. At the same time, the heat generated by friction dries them out, allowing the brakes to quickly regain their original sensitivity.
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