Basic Flashcards
7 cards from real Air Brake Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basic flashcards as text
What is the safety valve in the air supply system designed to do?
Answer: Release air if pressure gets too high
The safety relief valve opens to protect the system from over-pressurization.
What is total stopping distance for an air brake vehicle made up of?
Answer: Perception, reaction, brake lag, and effective braking distance
Air brake stopping distance adds brake lag distance to perception, reaction, and effective braking distance.
How does the added brake lag distance affect a vehicle's total stopping distance?
Answer: It increases total stopping distance
The brake lag adds extra distance, making total stopping distance longer.
What should you check on the brake chambers and slack adjusters during inspection?
Answer: That they are securely mounted and not damaged or leaking
Inspect chambers and slack adjusters for secure mounting, damage, and air leaks.
What is the function of the relay valve in an air brake system?
Answer: To speed up application and release of the rear brakes
The relay valve shortens the response time of the rear brakes by supplying air locally.
Before driving, what air pressure should the system build to before the warning light goes off?
Answer: At least 60 psi, building toward normal operating pressure
Pressure must rise above the warning threshold (about 60 psi) and continue building to normal levels before driving.
What should you do if your vehicle has automatic slack adjusters?
Answer: Still inspect them, since they require periodic checking and maintenance
Automatic slack adjusters still need inspection and occasional maintenance to work correctly.