CDL Air Brakes – Complete Study Flashcards
Master the air brake system for your CDL exam with these 30 targeted flashcards covering components, inspection procedures, safety limits, and brake failure techniques. Each card focuses on a single testable concept to help you pass the CDL General Knowledge and Air Brakes endorsement tests.
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Preview Questions
Question 1
What is the purpose of the air compressor in an air brake system?
Answer
The air compressor pumps air into the storage tanks to build and maintain the air pressure needed to operate the brakes.
Question 2
What is the function of the air dryer in an air brake system?
Answer
The air dryer removes moisture and contaminants from the compressed air before it enters the storage tanks, preventing freeze-ups and corrosion.
Question 3
What does the governor control in an air brake system?
Answer
The governor controls when the air compressor pumps air by cutting out at a set maximum pressure and cutting in again when pressure drops to a minimum level.
Question 4
At what pressure does the governor typically cut out the air compressor?
Answer
The governor cuts out the air compressor at approximately 125 psi (the cut-out pressure), stopping compression until pressure drops back to the cut-in level.
Question 5
What is the purpose of the safety relief valve in the air tank?
Answer
The safety relief valve opens to release air if the pressure in the tank exceeds the maximum safe level (usually 150 psi), protecting the system from over-pressurization.
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