The Aeroflow Performance brake vacuum reservoir tank will let you run vacuum-assisted power brakes by storing the vacuum produced by the engine or by an aftermarket vacuum pump. It does not create any additional vacuum by itself. Since the brake systems performance is directly related to the vacuum available, we highly recommend you install a vacuum gauge in the reservoir tank to monitor it, an outlet is provided for this in the tank if required. They are made for cars equipped with big cams and power brakes. These tanks approximately double the volume of vacuum available for your power brakes. They are recommended for cars with 14 in. of vacuum or less. It comes with a vacuum valve and a mounting bracket, available in either polished or black finishes.