CDL Air Brake Air Tanks and Drains 3

Question 1

What prevents air from flowing backward from the primary tank to the supply tank if there is a failure?

Accepted Answer

A one-way check valve

Answer

One-way check valves are installed between tanks to ensure that if one section of the system fails, air cannot flow backward and depressurize other tanks.

Question 2

What could result from allowing oil contamination to build up in air tanks over time?

Accepted Answer

Damage to valves, seals, and brake components

Answer

Oil buildup in air tanks deteriorates rubber seals and valves throughout the brake system, leading to leaks and brake malfunction.

Question 3

If a vehicle has automatic drain valves on the air tanks, what is still required of the driver?

Accepted Answer

Check that the automatic drain valves are functioning properly during pre-trip inspection

Answer

Even with automatic drain valves, drivers must verify during pre-trip inspection that the valves are working correctly and not clogged or frozen.

Question 4

What is the purpose of having multiple air tanks in a split (dual) air brake system?

Accepted Answer

To keep the front and rear brake circuits separate so one failure does not disable all brakes

Answer

A dual system uses separate tanks for primary and secondary circuits, ensuring that a failure in one circuit still leaves the other operational for safe stopping.

Question 5

What does it indicate if air tanks need to be drained more frequently than usual?

Accepted Answer

Excessive moisture or oil is entering the air system, possibly indicating compressor wear

Answer

Unusually frequent need to drain tanks suggests excessive moisture or oil contamination, which may indicate compressor wear, a failing dryer, or other system problems.

CDL Air Brake - Commercial Driver's License Air Brakes Test Practice Test

CDL Air Brake - Commercial Driver's License Air Brakes Test Practice Test

CDL Air Brake Air Tanks and Drains 3