Air Brakes CDL Practice Questions
68 free Air Brakes CDL-style practice questions.
If air pressure is not built up within the correct amount of time, then:An air brake system is fully charged at what psi?The proper use of the brakes when going down a long steep grade after selecting a proper gear is to…Air braking takes more time than hydraulic braking because:Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of…Why drain water from compressed air tanks?A straight truck or bus air brake system should not leak at the rate of more than _____ psi per…Why should you drain water from compressed air tanks?The braking power of the spring brakes:Excessive heat caused by using your brakes too often can also cause:Stab braking:With air brake vehicles, the parking brake should be used:If you must make an emergency stop, you should brake so you:Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system,…Excessive use of the service brakes results in overheating, which can lead to:Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only…When brakes are applied, the brake shoes will press against the:The air brake lag distance at 55 mph on dry pavement adds about ____ feet.The driver must be able to see a low air pressure warning which comes on before pressure in the service…If your vehicle has an alcohol evaporator, it is there to:What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?Under normal conditions, in order to engage the parking brakes, the driver should:Which of these is NOT a proper time to apply the parking brakes?To check the free play of manual slack adjusters of S-cam brakes, you should park on:The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak…If you do not have automatic tank drains, how often should you drain the oil and water from the bottom…A slack adjuster's free play needs to be adjusted if it is more than about ______ when you pull hard…If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply…If your truck has a dual air brake system, and one of the systems is low on pressure:What is a \"Wig Wag\"The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:The safety valve is set automatically when pressure is:Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.If the spring brakes are on, when should you push the brake pedal?The safety valve reduces pressure at ___ psi.The stop light switch:The air compressor governor controls:The ____ shows how much pressure is in the air tanks.The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake…When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?During normal driving, spring brakes are usually held back by:The air loss rate for a straight truck or bus with the engine off and the brakes on should not…If your truck has a properly functioning dual air brake system and minimum-size air tanks, the air pressure should build…Repeatedly partially increasing and pressing the brake pedal may result in:Your brakes are fading when:If the air compressor should develop a leak, what keeps the air in the tanks?The most important thing to do when a low air pressure warning comes on is:It is accepted that too much heat caused by using your brakes too often can also cause:If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
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