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Why can't the brake be pressed when starting with one key?

2 Answers

Destiny

07/24/25 6:01am

When starting with one key, the brake cannot be pressed because the vacuum in the vacuum booster is exhausted after stepping on the brake pedal several times when the engine is off. Since the engine is not running, the vacuum cannot be replenished. You can press the one-key start button to power on, then apply more force to press the brake pedal to unlock it. If you haven't stepped on the brake pedal unnecessarily several times after the vehicle is turned off, it is likely that there is an issue with the brake pedal itself, which requires inspection and repair at a 4S shop. The one-key start in cars is a part of smart car devices, a button mechanism designed to simplify the ignition process, and it can also be used to turn off the engine.

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LeElliott

08/11/25 1:45am

I encountered this issue with my keyless start car before - the brake pedal becoming too stiff to press is really annoying. The main reason is that the vehicle's brake booster system relies on engine-generated vacuum assistance. After parking and turning off the engine, the vacuum disappears, making the brake pedal hard to depress. The solution is quite simple: try turning on the electrical system (without starting the engine), wait a few minutes for system initialization, then gently pump the brake pedal a few times to see if some pressure builds up. If that doesn't work, simply start the engine and try again - the assistance usually returns. Regular maintenance is key: always check the vacuum pump and lines for leaks or aging, as any air leakage can cause trouble. Routine brake system maintenance prevents problems - don't neglect it like I did before, which left me stuck in a parking lot for ages. Safety first: never force the pedal when this happens; find a safe spot to address the issue.

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