Is it safe to park a car with automatic transmission without using the parking brake?

While it may not be unsafe or damaging to your vehicle to park without the parking brake engaged, it is considered best practice to use the parking brake whenever you park your car, regardless of the transmission type. Engaging the parking brake provides an extra layer of security, especially if you're parked on a hill or in an area with potential hazards.

Here are the reasons why it is advisable to use the parking brake:

1. Added security: The parking brake provides a mechanical means to keep the vehicle from rolling by locking the rear wheels in place. This is particularly important if the car is parked on an incline or a sloping surface, as it helps prevent unintentional movement and potential accidents. Even if you're parking on level ground, the parking brake can help secure the car in case the transmission is not fully engaged or if the gearshift accidentally slips.

2. Reduced strain on the transmission: When you park your car without using the parking brake, you are relying solely on the transmission's "Park" position to hold the vehicle in place. This can put unnecessary strain on the transmission components over time, especially if you park on an incline or if the car is jostled or bumped. Engaging the parking brake helps to distribute the load between the transmission and the brakes, reducing the stress on the transmission and prolonging its lifespan.

3. Enhanced brake life: Using the parking brake helps to preserve the life of your brake pads and rotors. When you park without the parking brake engaged and rely solely on the transmission, your car's weight rests on the brake pads. Over time, this can cause the pads to wear prematurely and require more frequent replacement. Using the parking brake diverts this weight from the pads and onto the parking brake mechanism, reducing wear and tear on your brakes.

4. Peace of mind: Engaging the parking brake provides peace of mind, knowing that your vehicle is securely immobilized. This is particularly important if you're leaving your car unattended for a significant amount of time or if you're parking in an unfamiliar or busy area.

To summarize: While not necessarily unsafe or damaging to your car, it is a good practice to use the parking brake every time you park, regardless of the transmission type. This simple step adds an extra layer of safety, reduces strain on the transmission, preserves brake life, and offers peace of mind.