Auto Veteran - What Happens If You Press the Throttle and Brake Together in an Automatic Car?

What Happens If You Press the Throttle and Brake Together in an Automatic Car?

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Auto Veteran
Updated on Dec 04, 2024

If you drive an automatic car, you might have wondered what would happen if you press the throttle and brake together. Would the car speed up or slow down? Would the car stop or keep moving? Would the car break down or explode?

In this article, we will answer these questions and explain what happens if you press the throttle and brake together in an automatic car. We will also tell you why you should never do this, and what are the consequences of doing this. Let’s get started!


The Difference Between Automatic and Manual Cars

Before we explain what happens if you press the throttle and brake together in an automatic car, we need to understand the difference between automatic and manual cars. A manual car is a car that has a clutch pedal and a gear stick, and the driver has to change the gears manually. An automatic car is a car that has no clutch pedal and no gear stick, and the car changes the gears automatically.

The main difference between automatic and manual cars is how they use the engine power to move the wheels. A manual car has a direct connection between the engine and the wheels, and the driver can control the amount of power by changing the gears. An automatic car has an indirect connection between the engine and the wheels, and the car uses a device called a torque converter to transfer the power.

A torque converter is a device that has two fans that spin in a fluid. One fan is connected to the engine, and the other fan is connected to the wheels. When the engine spins the first fan, it pushes the fluid and makes the second fan spin, which moves the wheels. The faster the engine spins the first fan, the faster the second fan spins, and the faster the wheels move.


The Effect of Pressing the Throttle and Brake Together in an Automatic Car

Now that we know how automatic cars work, we can explain what happens if you press the throttle and brake together in an automatic car. The throttle is the pedal that controls the amount of gas that goes into the engine, and the brake is the pedal that controls the amount of friction that stops the wheels. When you press the throttle and brake together, you are sending two opposite signals to the car: one to speed up and one to slow down.

What happens next depends on the age and the type of the car. Some cars have a system that prevents you from pressing the throttle and brake together, and some cars have a system that allows you to do this for a special purpose. Here are some examples of what could happen:

  1. If you have a modern car that has a computer that controls the engine and the brakes, the computer will detect that you are pressing the throttle and brake together, and it will ignore the throttle and prioritize the brake. This means that the car will slow down or stop, and the engine will not rev up. The computer will do this to protect the car and the driver from damage and injury. This is the safest and smartest option for most cars and situations.
  2. If you have an older car that has a mechanical connection between the engine and the brakes, the car will not have a system that prevents you from pressing the throttle and brake together, and it will try to do both. This means that the car will try to speed up and slow down at the same time, and the engine will rev up. However, the brake will be stronger than the throttle, and the car will eventually slow down or stop. But while this is happening, the car will overheat the fluid in the torque converter, and the fluid will start to smell bad and boil. This will damage the torque converter and the transmission, and it will cost you a lot of money to fix. This is the worst and most expensive option for most cars and situations.
  3. If you have a special car that has a dual clutch transmission or a launch control feature, the car will have a system that allows you to press the throttle and brake together for a special purpose. A dual clutch transmission is a type of automatic transmission that has two clutches that can change the gears faster and smoother. A launch control feature is a type of system that helps the car accelerate faster and better. When you press the throttle and brake together in these cars, the car will prepare to launch.  This means that the car will rev up the engine and hold the clutch, and when you release the brake, the car will release the clutch and accelerate as fast as possible. This is a fun and exciting option for some cars and situations, but you should only do this if you know what you are doing, and if you are on a safe and legal road.


In conclusion, if you press the throttle and brake together in an automatic car, you will get different results depending on the age and the type of the car. Some cars will ignore the throttle and prioritize the brake, some cars will try to do both and overheat the fluid, and some cars will prepare to launch and accelerate fast. However, you should never do this, unless you have a special car and a special reason, because it is dangerous and damaging for you and your car. You should always use the throttle and brake separately, and follow the traffic rules and the car instructions. 

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