* Automatic Transmissions and Engine Braking: Automatic transmissions use a torque converter to transfer power from the engine to the wheels. When you're in drive, the torque converter is engaged, allowing the engine to provide braking force (engine braking) as you slow down. However, engine braking is not as strong as applying the brakes directly.
* Gravity vs. Engine Braking: On a steep hill, the force of gravity pulling the car downwards can be stronger than the engine braking force.
* Brake Pedal and Automatic Transmissions: When you apply the brake pedal in an automatic transmission, you're actually applying hydraulic pressure to the brake calipers, not directly engaging the engine.
Here's what happens in this scenario:
1. The Car is in Drive: The torque converter is engaged, allowing the engine to provide some braking force.
2. The Brake Pedal is Applied: This applies pressure to the brake calipers, slowing the car down.
3. The Hill is Steep: Gravity is pulling the car downwards with a strong force.
4. Gravity Overcomes Braking: If the hill is steep enough, the force of gravity will overcome the combined braking force of the engine and your brake pedal.
Important Note:
* This is a dangerous situation and should be avoided.
* Always use the parking brake on an incline, even if the car is in drive.
* If you find yourself in this situation, shift the car into "Park" or "Neutral" and engage the parking brake immediately.
Let me know if you have any other questions!
