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Question:

What is the best way to test if your vehicle's spring brakes come on automatically?

1. On tractor-trailer vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.

2. Continue to step on and off the brake pedal until the manufacturer's low psi specification has been met for spring brakes to deploy.

3. On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.

4. All of the above

Answer: All of the above

Explanation
On both tractor-trailer vehicles and single vehicles, you can test whether your vehicle's spring brakes will come on automatically by continuing the same method you use for testing the low air pressure warning signal--stepping on and off your brake pedal, this time until you reach an even lower psi reading and the parking brake valve closes or pops out.
This question is in Section 3: Air Brake of our CDL Test Guide. Explore now!
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