The term PAD SITE can be broken down into two crossword solutions: KNEE (4 letters) and BRAKE (5 letters). KNEE is a joint in the middle of the leg that connects the thigh and lower leg bones. It is also the largest joint in the body and is responsible for bending and straightening the leg. BRAKE is a device used to slow or stop the motion of a vehicle, usually by pressing a pedal or lever. It is an important safety feature in cars and other vehicles.