Welcome to the Air Brake Quiz 1. The weight of a vehicle is doubled. To stop in the same distance, the braking power must be increased: 8 times 6 times 4 times 2 times2. In a dual circuit air system, air from the primary and secondary air reservoirs is directed to: The relay valve The foot valve The one-way check valve The front wheel limiting valve3. The main purpose of the hand valve is to: Act as an emergency brake if the foot valve fails Supplement the other braking system Control the amount of application air directed to the tractor brakes Control the amount of application air directed to the trailer brakes4. In a 105 PSI system, the governor will cause the compressor to return to its pumping stage at a pressure of: 65 PSI 105 PSI 85 PSI 95 PSI5. If the brakes are out of adjustment, the force of the spring brakes when applied will be: Greater Variable The same Less6. In a dual circuit air system, the valve that protects the primary circuit from air loss in the secondary circuit is the: Emergency relay valve Limiting valve Two-way check valve Dual circuit foot valve7. When a trailer without spring parking brakes is disconnected and left parked, you should make sure: The trailer is dynamited The air lines are sealed The brakes are properly adjusted The wheels are blocked8. The low pressure warning device activates at: 40 PSI 85 PSI 60 PSI 50 PSI9. When a compressor discharge line is broken, total loss of air is prevented by the: Governor valve Relay valve One-way check valve Two-way check valve10. If your brakes do not seem to be holding even when air pressure is sufficient, you should: Continue normally, as long as you have some braking power Travel at a reduced speed Report the condition at the end of the trip Stop, check the brakes and make adjustments11. A tug test on the trailer brakes should be done with the: Foot valve applied Hand valve applied Parking brake and hand valve applied Parking brake applied12. Why should you lock the tractor glad hands to each other, or use dummy couplers when you are NOT towing a trailer? It saves wear on the compressor The brake circuit becomes a back-up air tank It keeps dirt and water out of the lines If you did not, you could never build up system pressure13. The foot valve: Needs reservoir pressure to control it to within 10 PSI Continuously maintain applied pressure when in use Automatically adjusts to braking requirements Should be used instead of the hand valve14. When the foot and hand valve are operated at maximum at the same time, the application pressure will: Be the same as the reservoir pressure Be greater than reservoir pressure Be less than the reservoir pressure Compound the force exerted on the brake chambers15. The 20 lb range between the cut-in and cut-out of the governor serves to: Cool the compressor Reduce condensation in the wet tank Give the system a pressure variation Remove impurities from the lines16. When necessary, a driver should use the manual front wheel limiting valve on slippery roads: To reduce the brake application by 25 percent Instead of the hand valve To reduce the brake application pressure by 50 percent To cut out the front wheel brakes17. Responsibility for ensuring that the braking system is operational finally rests with the: Driver Company mechanic Company or owner Maintenance crew18. The final factor in determining if a vehicle will move is the amount of: Friction Traction Power Inertia19. Reservoirs should be drained at least: Monthly Weekly Bi-weekly Daily20. To stop a vehicle, the energy of motion is turned into: Heat in the brake lining and drums Friction Moisture in the reservoirs Traction Your Name Time is Up!