Which of the following braking devices does not exist in a vehicle?
Active and passive safety
Explanation
The **correct answer** is **1: Engine and body brake**, because this device does not exist in a vehicle.
- **Engine brake**: It is a system that allows reducing the vehicle's speed without using the wheel brakes. It works by stopping acceleration, causing the engine to hold back the vehicle. It is especially useful when going down long slopes. However, it does not combine with the body, as it only involves the engine.
- **Emergency brake**: Although not mentioned in the fragments, it is a real device used in emergency situations when the main brake system fails.
- **Parking brake**: It is a common device in vehicles used to keep the vehicle stationary when parked.
Therefore, the "engine and body brake" is not a real device, as there is no system that combines the engine and the body to brake a vehicle.
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