TENNESSEE CDL AIR BRAKES PRACTICE TEST
11.
The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
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it is shaped like the letter "S".
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"S" stands for "Shoes".
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it is a safe-driving brake.
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it applies a "Shock" to the brakes.
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12.
How do you test hydraulic brakes for leaks?
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Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
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Pull forward against parking brake to make sure the hydraulic brakes holds.
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Pump the brake pedal ten times and see if it holds.
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None of the above.
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13.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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at 30 psi.
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if there is too little pressure.
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every 15 minutes.
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if there is too much pressure.
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14.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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30 to 35 psi.
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20 to 45 psi.
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55 to 74 psi.
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5 to 15 psi.
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15.
The air compressor governor controls:
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the speed of the air compressor.
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when air tank pressure falls below the “cut-out” level.
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the air pressure applied to the brakes.
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when the air compressor will pump air into the air storage tanks.
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