Your car is secretly braking in the rain #car #shorts

The development of Brake Disc Wiping (BDW) was a response to the "wet brake lag" phenomenon, which became more prominent as cars got heavier and faster. In heavy rain, centrifugal force is often not enough to clear the water film from the rotors. Mercedes-Benz was one of the first to introduce this technology in their 2005 S-Class (W221) under the name "Brake Drying." The logic was simple: visibility is reduced in rain, so braking response must be optimized to the maximum.

Technically, the system is purely software-based, utilizing the existing hydraulic pumps of the ABS/ESP module. It typically activates when the wipers have been on for a certain period (e.g., 5 seconds) and the vehicle is traveling above a certain speed (usually 50–70 km/h). The pulses occur every few minutes. The pressure is so minute (around 2–3 bar) that the friction produces negligible heat and zero noticeable deceleration, meaning there is no extra wear on the pads. Today, this feature is standard on most German vehicles (VW Group, BMW, Mercedes) and is increasingly found in American and Asian brands as part of their advanced stability control packages.

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