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Air Brakes

CDL

QuestionAnswer
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels? Never
The stop light switch_______ Turns on your brake lights to warn drivers behind you.
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
To test air service brakes you should________. Brake firmly while slowly moving forward.
A slack adjusters free play needs to be adjusted if it is more than about _________ when you pull on it? 1 inch
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.
The safety valve reduces pressure at _________ psi? 150
Why should you drain water from compressed air tanks? Water can freeze in cold weather and cause brake failure.
If your vehicle has an alcohol evaporator, everyday during cold weather you should _________. Check and fill the alcohol level
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
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
The air brake lag distance at 55 mph on dry pavement adds about ________ feet? 32 feet
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
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.
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
Excessive use of the service brakes results in overwhelming which can lead to _______. Expansion of the brake drums.
The safety valve is set automatically when pressure is _______. 150
If you must make an emergency stop, you should brake so you __________. Can steer and so your vehicle stays in a straight line
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.
The brake pedal in an air brake system________. Control the air pressure applied to put on the brakes.
All air brake equipped vehicles have _________. A supply pressue gauge
With air brake vehicles, the parking brakes should be used _____________. Whenever you leave the vehicle unattended
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
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
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to _________? The braking effect of the engine
The most important thing to do when a low air pressure warning comes on is ________? Stop and safely park as soon as possible
The parking or emergency brake on a heavy vehicle can only be held on position by something that cannot leak away, like ____? Spring pressure
Why drain water from compressed air tanks? Water can freeze in cold weather and cause brake failure
Repeatedly partially releasing and pressing the brake pedal may result in _____? A loss of brake air pressure
The brake system that applies and release the brakes when the driver uses the brake pedal is the __________ brake system. Service
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
An air brake system is fully charged at what psi? 125
If the spring brakes are on, when would you push the brake pedal? Never
When brakes are applied, the brake shoes will press against the ______? Brake drum or disc
The safety valve discharges automatically at the pressure of _________? 150
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
Why should you drain water from compressed air tanks? Water can freeze in cold weather and cause barke failure
Modern air brake systems combine three different systems. They are the service, the parking and the ___________ brakes. Emergency
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
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
Created by: Honeynut718
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