Here's why:
* Power brakes rely on engine vacuum: The vacuum created by the engine is what assists in applying the brakes. This vacuum operates a booster that multiplies the force you apply to the brake pedal, making braking easier.
* Without engine vacuum, you lose power assist: When the engine fails, the vacuum is lost, and you're left with only manual braking.
* Manual braking is still possible: You can still stop the car using only the brake pedal, but it will require significantly more effort.
Important Note: In some vehicles with electric power brakes, you may retain some braking assistance for a short time after the engine fails due to a battery-powered backup system. However, this assistance will eventually diminish.
