A bumper is the front-most or rear-most part, designed to allow the vehicle to sustain an impact without damage to the vehicle’s safety systems.
A brake is a device that converts kinetic energy in to heat and thus stops the vehicle. There are different types of brakes in use today including drum brakes, disk brakes and combo valve.
BHP stands for Brake Horsepower. This is the power of the engine before the loss caused by gearbox, alternator, and other auxiliary components. It is called brake horsepower because a brake was used to load the engine and the horsepower was calculated by measuring the output torque and the rotational speed.
BDC stands for bottom dead centre. This is the lowest position of the piston before is moves back up.