CDL Air Brake Air Tanks and Drains 2

Question 1

What can happen if water is not drained from air tanks during cold weather?

Accepted Answer

The water can freeze and cause brake failure

Answer

Water left in air tanks can freeze in cold temperatures, blocking air lines and valves, which can cause total brake failure.

Question 2

Which air tank typically accumulates the most water and oil contamination?

Accepted Answer

Supply (wet) tank

Answer

The supply or wet tank receives air directly from the compressor and therefore collects the most water vapor and oil before air passes to other tanks.

Question 3

What type of drain valve removes moisture from air tanks automatically?

Accepted Answer

Automatic drain valve

Answer

Automatic drain valves expel accumulated moisture from air tanks without driver intervention, though they should still be checked during pre-trip inspections.

Question 4

What is the minimum number of air tanks required in a basic single air brake system?

Accepted Answer

One tank

Answer

A basic single air brake system requires at minimum one air tank, though most systems use multiple tanks for reliability and separation of circuits.

Question 5

Where are drain valves typically located on air tanks?

Accepted Answer

At the bottom of the tank

Answer

Drain valves are located at the bottom of air tanks so that gravity causes water and oil to settle there, making draining effective.

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 2