Free Colorado CDL Double/Triple Trailers Practice Test 2023

Do you know how to pair double or triple trailers? If you are planning to take the CDL double/triple trailer endorsement test, make sure to know it! Our Colorado CDL practice test has the same questions as the real exam which is based on the Colorado CDL manual. It covers most of the subject areas on the Double/Triple Trailers Test such as pulling double and triple trailers, the risk of rollover, managing space, and special considerations when hauling multiple trailers. In addition, each question has a detailed explanation that will help you understand the concept and answer future questions about it correctly. If you don't get the pass right away, you can take this CDL practice test an unlimited number of times to make sure you learn all the questions. Let’s try our Free Colorado CDL Double/Triple Trailers Practice Test today and pass your CDL endorsement exam! Good luck and keep driving safely!

Our CDL practice tests:
Based on 2021 CO commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
CO CDL Double/Triple Trailers Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
What is a modulating control valve?
What is the function of a stop light switch?
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
How can you be sure you supplied air to a second trailer?
Automatic slack adjusters ________.
After coupling, the air shut-off valves at the back of the first trailer should be:
The braking power of the spring brakes ______.
A low pressure warning signal could be __________.
With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. When you do this, you should hear:
How do you check the low pressure warning signal?
What is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer?
During a normal drive, the spring brakes are held back by _____.
Letting up on the brake pedal _______.
A danger of a malfunctioning tractor protection valve is:
Where is compressed air stored?
Why should you never leave your vehicle unattended without applying the parking brakes?
When inspecting doubles and triples shut-off valves, which of the following is true?
Vehicles with air brakes have pressure gauges connected to the _______.
You can test whether the trailer air system is charged by:
A visual inspection after coupling should show that: