DoT - Air Brakes 1of3

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Air brakes are vital components in bus driving, offering reliability, safety, and performance. They provide consistent braking power under demanding conditions, ensuring precise control over braking forces to enhance safety on the road. With their durable construction, air brakes withstand the rigors of daily bus operation and minimize maintenance requirements, contributing to long-term reliability and efficiency. Their superior performance compared to hydraulic brakes makes them indispensable in larger vehicles like buses, meeting regulatory requirements while ensuring optimal braking performance for the safety of passengers, drivers, and other road users.
The following questions test for understanding of basic concepts of air-brake technology

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Why is the Air Pressure Gauge front & center on the operator’s Instrument Panel?

1 point

a) The Air Pressure Gauge connects to air lines behind the panel so it can only be there

b) It’s important for the operator to monitor coach air pressure throughout operations

c) The Air Pressure Gauge is large so the best fit is in the center of the Instrument Panel

d) None of the above

Why does the coach have a Low Air Pressure Warning light and buzzer?

1 point

a) The buzzer & light remind the operator that air pressure is building during the pre-trip

b) The buzzer & light warn the operator that the Emergency Brakes may soon engage

c) The buzzer & light distract customers from talking to the operator when they’re busy

d) All of the above

Why are leaking Air Brakes a less immediate safety issue than leaking Hydraulic Brakes?

1 point

a) The coach is less likely to be damaged in a run-away collision than any objects it hits

b) The Air Compressor replenishes air pressure faster than most leaks can deplete it

c) The coach Emergency Brake will engage if the air pressure gets too low

d) All of the above

Which feature of the coach Parking Brakes is a fail-safe component of the Air Brake system?

1 point

a) The coach Parking Brake is always on unless there’s enough air pressure to release it

b) The coach Parking Brake is activated by a switch, while a car’s is a handle or a pedal

c) The coach Parking Brake can hold more weight steady than car parking brakes can

d) All of the above

Why are no errors whatsoever allowed when performing the DOL Air Brake Test?

1 point

a) Operators must fully understand how to operate the vehicle’s primary safety system

b) Operators must fully understand how to inspect the vehicle’s primary safety system

c) The DOL & Metro expect the highest degree of studiousness from trainee operators

d) All of the above

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