This car button tricks even experienced drivers: What really happens when you press it while driving?

Activating an electric parking brake while driving is a maneuver that experts strongly advise against, as it functions differently from a traditional handbrake and can lead to system issues. While modern electric parking brakes are standard in most new vehicles, offering convenience for hill starts, their operation differs significantly from older mechanical systems.

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The control unit of the car recognizes such a situation as normal braking, preventing wheel lock-up. Instead, the brake acts intermittently, with the ABS system engaged.

When a driver pulls the electric brake switch during motion, the car's control unit interprets this as a standard braking event, not a full lock-up of the wheels. Instead of engaging a direct mechanical lock, the system activates intermittently, often in conjunction with the Anti-lock Braking System (ABS). This is a crucial distinction from a conventional handbrake, which directly locks the rear wheels.

Traffic experts, including Željko Marušić, emphasize that the electric parking brake is a static braking mechanism. This means it is designed for use when the vehicle is completely stationary. Prematurely engaging it while the car is moving introduces dynamic load into the system. This added stress can potentially compromise the brake's reliability and shorten its operational lifespan, particularly at higher speeds.

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The advice is clear: avoid activating the electric brake while driving.

Furthermore, the correct procedure for engaging the electric parking brake varies depending on the transmission type. For vehicles with manual transmissions, it should only be activated after shifting into first gear. For automatic transmissions, the gear selector must be in the 'P' (Park) position. The article, sourced from HAK Revija and Večernji List, highlights that the mechanism relies on hydraulics or mechanics, ensuring it functions even if the car's battery is depleted, but strict adherence to operating instructions is necessary.

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It is a static braking, so the vehicle must be completely stopped before activation. Premature activation creates dynamic load in the system, which can jeopardize its reliability and shorten its lifespan, especially at higher speeds.