AIR BRAKES CDL PRACTICE TEST - OHIO
21.
Hydroplaning is more likely if:
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tire tread is worn.
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tire pressure is low.
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All of the above.
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22.
Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
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It takes one half second or more for the air to flow through the lines to the brakes.
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Stopping distance for vehicles with air brakes is made up of six different factors.
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Air brakes use different brake drums.
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23.
Which of the following is NOT part of the drum brake?
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Safety valve
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Axle
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Brake drum
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24.
Brake lag is:
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the time required for the air brakes to work after the brake pedal is pushed.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the amount of air pressure required to stop the vehicle.
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25.
To check the slack adjusters on S-cam brakes, you should:
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release the parking brake valve and begin reducing the air pressure by stepping on and off the brake pedal.
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park on level ground and fan off the air pressure by rapidly applying and releasing the foot brake.
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park on level ground, chock the wheels and release the parking brakes, then use gloves and pull hard on each slack adjuster that you can reach.
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