Air Break Practice Test Results - #1. Evacuating air from the brake chambers will apply The service brakes. The service brakes. The spring brakes. The spring brakes. Neither the spring brakes nor the service brakes. Neither the spring brakes nor the service brakes. Both the spring brakes and the service brakes. Both the spring brakes and the service brakes. The spring brakes are held back by air pressure. If air pressure is lost, the spring brakes will kick in. Next