BHP stands for brake horsepower and PS stands for Pferdestärke, or horse-strength in German. Both units describe the power output of a vehicle's engine.
Both units are widely used in the automotive world. BHP is less than the total horsepower of an engine and looks at the amount of energy remaining after the alternator, water pump and other systems have been powered up. BHP is measured at the road wheels, rather than at the flywheel, and the higher the BHP, the more powerful the engine.
PS is still commonly used by car makers from Germany and other countries, although it was replaced as the official EU measurement of engine power by kW or kilowatts in 1992. One PS is the equivalent of about 98.6 percent of 1 BHP.