Yes it is necesary. It is called Preventive Maintenance. In fact i would done that mutch earlier.Like your engine needs oilchange all others systems that use oil or fluid the fluid needs to be replaced .Including your brake system.
Yes ! I use BG products myself for almost 10 years. They great products and the company stands behind to they products even with warranty to your engine - tranmission- cooling system- brake system and power steering and they pay for repairs in case of malfunction while you using they products.