Brake horse power can be defined as the maximum rate at which an engine can do work as measured by the resistance of an applied brake. It is the measure of the engine's horsepower before the loss in power.
3 Additional Answers
Brake horsepower was originally designed to calculate and compare the output of steam engines. It is a unit used for the calculation of an engine's capacity of doing work and the amount of work generated by a motor under ideal conditions.
Brake-horsepower refers to the horsepower measured at the wheels of an automobile. A certain percentage of horsepower created at the fly wheel will be lost through the drive train.
Brake horsepower refers to the amount of horsepower and engine has before there is any loss of power due to things that the engine runs. Some things that cause loss of power are the alternator and water pump.