MA CDL AIR BRAKES PRACTICE TEST
16.
Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
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It was built after March 1, 1998.
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The letters "ABS" are printed on the side of the steering wheel.
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Wheel speed sensor wires are coming from the back of the brakes.
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It has yellow ABS malfunction lamps.
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17.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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None of the above.
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18.
Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = ?
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Partial Stopping Distance
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Stopping Distance - (minus) Brake Fade Distance
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Total Stopping Distance
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Total Air Pressure
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19.
In some vehicles a modulating control valve may be used to:
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apply the parking brake.
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apply the spring brakes gradually.
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decrease the pressure in the brake system.
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apply the front brakes.
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20.
When going down grades, you should:
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put the transmission in Neutral.
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downshift to a lower gear.
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shift up.
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rely solely on engine braking to reduce your speed.
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