CDL
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels? | Never
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| The stop light switch_______ | Turns on your brake lights to warn drivers behind you.
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| It is not safe to drive a vehicle that has brake drums with cracks longer than_______ of the width of the friction area. | 1/2
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| To test air service brakes you should________. | Brake firmly while slowly moving forward.
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| A slack adjusters free play needs to be adjusted if it is more than about _________ when you pull on it? | 1 inch
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| If air pressure is not built up within the correct amount of time, then ___________? | Your air pressure may drop to a low point while driving, requiring an emergency stop.
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| The safety valve reduces pressure at _________ psi? | 150
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| Why should you drain water from compressed air tanks? | Water can freeze in cold weather and cause brake failure.
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| If your vehicle has an alcohol evaporator, everyday during cold weather you should _________. | Check and fill the alcohol level
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| The air loss rate for a straight truck or bus with the engine off and the brakes on should not be worn more than ________. | 3 psi in one minute
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| The driver should be able to see a low pressure warning which comes on before pressure in the service air tanks falls below ________ psi? | 60
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| The air brake lag distance at 55 mph on dry pavement adds about ________ feet? | 32 feet
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| If your truck has a properly functioning dual air brake system and minimum size air tanks the air pressure should build up from 85 to 100 psi within how many minutes? | 45
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| How should you check that your service brakes are working properly? | Park on ground level, wait until normal air pressure is reached, release the parking brake and move forward slowly at 5 mph. Then apply the brakes firmly using the brake pedal.
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| A straight truck or bus air brake system should not leak at the rate of more than _________ psi per minute with the engine off and the brakes released. | 2
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| Excessive use of the service brakes results in overwhelming which can lead to _______. | Expansion of the brake drums.
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| The safety valve is set automatically when pressure is _______. | 150
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| If you must make an emergency stop, you should brake so you __________. | Can steer and so your vehicle stays in a straight line
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| Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do? | Stop right away and safely park. Continue only after the system is fixed.
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| The brake pedal in an air brake system________. | Control the air pressure applied to put on the brakes.
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| All air brake equipped vehicles have _________. | A supply pressue gauge
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| With air brake vehicles, the parking brakes should be used _____________. | Whenever you leave the vehicle unattended
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| A straight truck or bus air brake system should not leak at the rate of more than ________ psi per minute with the engine off and the brakes released. | 2
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| To check the free play of manual slack adjusters of S-cam brakes, you should park on ______? | Level ground, check the wheels and release the parking brakes
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| The use of brakes on a long and steep downgrade under normal conditions is only a supplement to _________? | The braking effect of the engine
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| The most important thing to do when a low air pressure warning comes on is ________? | Stop and safely park as soon as possible
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| The parking or emergency brake on a heavy vehicle can only be held on position by something that cannot leak away, like ____? | Spring pressure
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| Why drain water from compressed air tanks? | Water can freeze in cold weather and cause brake failure
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| Repeatedly partially releasing and pressing the brake pedal may result in _____? | A loss of brake air pressure
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| The brake system that applies and release the brakes when the driver uses the brake pedal is the __________ brake system. | Service
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| A slack adjusters free play needs to be adjusted if it is more than about ________ how many inches when you pull hard on it? | 1 inch
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| An air brake system is fully charged at what psi? | 125
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| If the spring brakes are on, when would you push the brake pedal? | Never
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| When brakes are applied, the brake shoes will press against the ______? | Brake drum or disc
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| The safety valve discharges automatically at the pressure of _________? | 150
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| Emergency stab braking is ________? | Press on the brake pedal as hard as you can, release the brakes when the wheels lock, put on the brakes again when the wheels start rolling
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| Why should you drain water from compressed air tanks? | Water can freeze in cold weather and cause barke failure
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| Modern air brake systems combine three different systems. They are the service, the parking and the ___________ brakes. | Emergency
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| If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks? | At the end of each day of driving
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| The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ________ mph below the posted speed for your safety and release your brake | 15 mph
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