Question 1When the brakes are applied on a moving vehicle, what happens to the vehicle’s kinetic energy?
Question 2What is the primary purpose of brake fluid in a hydraulic brake system used on passenger vehicles?
Question 3What do air brake systems use to apply the brakes on most large commercial vehicles?
Question 4Which statement is true about air brake systems?
Question 5Which statement about vehicles equipped with air brake systems is correct?
Question 6What is the function of an air compressor in an air brake system?
Question 7Why must compressed air be handled carefully in an air brake system?
Question 8What is the primary function of an air compressor in an air brake system?
Question 9How are air compressors commonly powered on vehicles equipped with air brake systems?
Question 10How are air compressors typically mounted on vehicles with air brake systems?
Question 11What is the function of the air compressor governor in an air brake system?
Question 12What is the normal operating pressure range for a vehicle air brake system?
Question 13Why is it unsafe to operate a vehicle when the air pressure is outside the air brake system’s normal operating range?
Question 14What air tanks are commonly used on vehicles with air brake systems to store compressed air?
Question 15Why must air tanks in an air brake system be drained regularly?
Question 16What do air pressure gauges indicate in a vehicle equipped with a dual-service air brake system?
Question 17What is the purpose of a safety valve in an air brake system?
Question 18What is the purpose of audible and visual low air pressure warning devices in an air brake system?
Question 19What is the primary function of an air dryer in an air brake system?
Question 20What is the purpose of an alcohol evaporator in an air brake system?
Question 21What is the primary function of the brake pedal in a vehicle with an air brake system?
Question 22What is the function of a manually controlled front-wheel limiting valve in an air brake system?
Question 23What causes the stroke of an air brake chamber pushrod?
Question 24Which statement about air brake chambers is correct?
Question 25How can spring brake chambers be distinguished from service brake chambers?
Question 26Why must spring brake chambers be handled carefully during maintenance?
Question 27Why are spring brake chambers mechanically compressed or caged?
Question 28Which statement about the spring brake control valve is correct?
Question 29When can the spring brake control valve be used?
Question 30When do the spring brakes automatically apply on a vehicle with an air brake system?
Question 31What components are included in a trailer brake subsystem?
Question 32What is the purpose of trailer couplers (gladhands) in an air brake system?
Question 33How can trailer couplers (gladhands) usually be identified and protected from incorrect connection?
Question 34What is the result of crossed trailer couplers (gladhands)?
Question 35What is the purpose of the trailer hand valve in an air brake system?
Question 36How is the trailer supply valve typically identified in a vehicle with an air brake system?
Question 37What is the primary function of a tractor protection valve on a towing vehicle?
Question 38What is the function of a spring brake priority trailer brake subsystem?
Question 39In a spring brake priority trailer brake system, what is the only way to apply the trailer brakes if trailer service air is lost?
Question 40Which components are used in an ‘S’ cam brake system?
Question 41Which components are used in a disc brake system?
Question 42Which components are used in a wedge brake system?
Question 43How does increasing a vehicle’s speed or weight affect the demand on its brakes?
Question 44What can happen if a vehicle is overloaded?
Question 45What is the effect of repeated or severe brake use?
Question 46What can result from excessively high brake temperatures?
Question 47What happens when a vehicle’s brakes are out of adjustment?
Question 48What happens when a vehicle’s tires skid?