What is the B gear on a Toyota Prius? Toyota Prius has a gear on the gear shift lever marked B, which is short for engine braking. When you put your car into B gear, it uses the engine as a brake when you’re going downhill, so you don’t have to use your brakes to slow down. If you are going down an especially steep hill, you can use the B gear to keep you going slower than you would if you were in drive with your foot off the gas. You don’t want to use B gear all the time, but it is useful in situations where you are going down Steep Hills, and it is completely safe to shift from drive into B gear and back while the car is moving. If your Prius has B mode, try it out.

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