A spring brake control valve (SBCV) option using integral one-way check valves for two reservoir systems that assures the loss of one reservoir will "protect" the other reservoir. Allows for the release of the parking brakes at least once after they have been applied due to the catastrophic loss of air pressure in one of the reservoirs. Simultaneously charges the reservoirs and releases the parking brakes when starting with 0 psi in the trailer air brake system.