What to Do When the Brake Suddenly Becomes Hard and Unpressable During Startup?
1 Answers
Possible causes are as follows: 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, and usually, after pressing the brake pedal three times, the remaining vacuum force is depleted, making the brake feel hard due to the lack of assistance. 2. The car's brake booster is leaking or malfunctioning. If you haven't pressed the brake pedal after turning off the engine or notice that the brake pedal is hard to press while driving, it's likely due to a faulty brake booster, possibly caused by a leak or blockage in the vacuum tube. Solutions are as follows: 1. If this issue is noticed before driving, it's safer to avoid driving and take the car to a repair shop for inspection. If it occurs while driving, stay calm, slow down, and stop the car. Try pressing the pedal multiple times to see if braking can be restored; applying more force usually allows some braking power. 2. For this scenario, simply restart the engine and press the brake pedal firmly to reactivate the system. Once the engine is running, the brake booster will resume functioning, and the brake pedal will return to normal.
