Why does the brake suddenly become very hard to press while driving?
1 Answers
The issue is related to pressing the brake before the engine is turned off; the car's braking system operates at its maximum efficiency only when the engine is running, and the brake booster pump is the key component behind the vehicle's braking function. When the engine is off, the brake booster pump stops working. Typically, pressing the brake pedal three times will deplete its remaining vacuum force, making the brake feel very hard due to the lack of assistance. Here are additional details: Solution: In this situation, simply restart the engine and then try pressing the brake pedal firmly again. Once the engine is running, the brake booster pump will resume operation, and the brake pedal will return to normal function.