Why are cars output power quoted in 'brake' horse power, why not just horse power?

Question:
Power is usually defined in horse power or watts, so why is a car quoted in brake horse power.

Answers:

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Brake horsepower is a way of cheating to show the highest engine output you can measure. The engine is stripped of all accessories, even the water pump (they must use an electric pump to circulate water during the test). Then the engine power is tested at the engine output shaft using a brake dynamometer, hence the term 'brake'. When you add water pump, fan, alternator, power steering pump and drivetrain losses, you can lose quite a bit of power. There are dynamometers that the car sits on and spins with the rear wheels, and the difference can be 50 horsepower or more. But bhp looks good in advertisements.

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Does the Scion tc have a transmission safety?

The brake horsepower refers to the power at the wheels. Some power is lost during transmission between the engine and the wheels. Because this loss varies from car to car, to compare like with like, power at the wheel (or brake) is used.

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Power under load conditions.
True driving power.

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