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Question:

If testing your hydraulic brakes for leaks, you should…

Answer: Pump the brakes 3 times, then apply pressure for 5 seconds

Explanation
When testing your hydraulic brakes, you want to pump the brakes three times. At that point, you should then hold the pedal down with firm pressure for five seconds. If it moves at all, it is possible that the brakes have a leak or other problem.
This question is in Section 1: General Knowledge of our CDL Test Guide. Explore now!
Related Question

Question: What is the definition of a pull-up?

Pulling your CMV forward, when you are in the process of backing, to reposition your trailer better

A pull-up is pulling forward to reposition yourself so that you can back your trailer at the best angle. You should do this as often as you need to back in a straight line if possible. You do not need to pull up short for any reason, nor should you ever pull forward at railroad crossings to get a better view if signals indicate a train is coming. Simply follow the signals to cross when safe, as you may not be able to see a train until it has almost arrived.

Question: You must drive on a slippery road. Which of these is a good thing to do in such a situation?

1. Slow down gradually.

2. Apply the brakes while on curves.

3. Use a smaller following distance.

Slow down gradually.

Question: Which of these is the best general rule for night driving?

1. Drive slightly faster than the other traffic.

2. Increase the normal (daytime) following distance by one second.

3. Drive slightly slower than the other traffic.

Increase the normal (daytime) following distance by one second.

Question: You supply air to the trailer tanks by:

Pushing in the trailer air supply valve.

Question: How would you expect a truck with a baffled cargo tank to handle on the road?

There will be less front-to-back surge than there is in tanks without baffles.

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