WI CDL AIR BRAKES PRACTICE TEST
11.
To check the slack adjusters on S-cam brakes, you should:
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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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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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All of the above.
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12.
The tire load rating is stated:
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on each axle.
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on the dashboard.
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on the side of each tire.
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inside the suspension system.
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13.
Parking brakes are:
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not required on trailers.
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not required on buses.
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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14.
The spring brakes come on:
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when main air pressure is lost.
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when you lose ABS control.
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when you bring the vehicle to a complete stop right away.
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15.
Spring brakes are usually held back by:
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the brake pedal.
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modulating control valves.
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the antilock braking system.
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air pressure.
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