Why does the Mercedes-Benz brake suddenly become very hard and difficult to press?

1 Answers
PeterRose
07/29/25 4:47pm
Here are the reasons why the Mercedes-Benz brake suddenly becomes very hard and difficult to press: 1. Related to pressing the brake before turning off the engine: The car's braking system works best when the engine is running, and the brake booster is the key component that amplifies the force applied to the pedal. When the engine is off, the brake booster stops functioning. Typically, pressing the brake pedal three times will exhaust its remaining vacuum force, making the brake feel very hard due to the lack of assistance. 2. Leakage or malfunction of the car's brake booster: If you haven't pressed the brake pedal after turning off the engine, the issue is likely caused by a malfunctioning brake booster. This could be due to a vacuum tube leak or blockage in the brake booster.
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