Question 29 - Air Brakes Test Practice Test for the CDL

What should you never do when the spring brakes are on?

Use the modulating valve.
Check the air in the air tanks.
Push the brake pedal down.
Press the gas pedal down.

Hint

Be alert for words like not, never, except, false, incorrect, least (likely), and other negative word forms in questions. These words change the purpose of your search for the correct answer.

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