Lack of Adequate Braking: If the parking brake is not engaged and the car is not fully stopped before shifting to drive, it could roll backward. This can happen if the driver inadvertently releases the brake pedal too soon or if the vehicle is on a slight incline.
Transmission Issues: In some cases, a faulty transmission or a disengaged transmission gear can cause the car to roll backward even when in drive. If the transmission is not properly engaging the gears, it may lose power and allow the car to roll freely.
Worn-Out Brakes: If the brakes are worn out or not properly adjusted, they may not provide sufficient stopping power, causing the car to roll backward. This is particularly risky on inclined surfaces.
Loss of Engine Power: If the car experiences a sudden loss of engine power, such as due to a mechanical failure, it may roll backward even with the transmission in drive.
Drive Shaft Problems: A worn or damaged drive shaft can cause the connection between the transmission and the wheels to be faulty, leading to a lack of power transmission and potential backward movement of the car.
