Air Break Practice Test Results - #1. Compressed air entering the brake chambers applies The spring brakes. The spring brakes. The service brakes. The service 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. When you press the brake pedal, compressed air enters the brake chambers and activates the service brakes Next