Combination #2
Combination Vehicles Practice Test | California 2026 #2 Page 2 of 3
Train for FREE online with our California CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a CA combination license in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.
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8 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:
In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.
9 . The service air line is attached to the:
The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.
10 . While inspecting coupling, you should go under the trailer and:
While inspecting coupling, you should go under the trailer and look into the back of the fifth wheel. Ensure that the fifth wheel jaws are secured around the shank of the kingpin.
11 . Before a drive, ensure that air flows to all trailers by:
Rolling each trailer down a hill and testing the brakes.
Before a trip, ensure that air in the air brake system reaches all trailers. Do this by waiting for air pressure to build, then sending air to both the emergency and service lines and opening the shut-off valves on the rear of the last trailer. If air escapes from the shut-off valves in the rear of the combination, the air is being supplied to the entire vehicle.
12 . Pull out the trailer air supply control to test:
The landing gear.
Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the "emergency" position. Pull forward slightly with the tractor and make sure the trailer does not move.
13 . Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.
At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. Follow the same formula when traveling at faster speeds, then add one additional second to your following distance. Remember that larger vehicles require more space to stop than smaller vehicles.
14 . When entering or crossing traffic while driving a combination vehicle, it is especially important that you:
Combination vehicles require more space on the road than other vehicles. When entering or crossing traffic while driving a combination vehicle, it is especially important that there is a large enough gap in traffic for you to safely do so.
See the exact questions that will be on the 2026 California DMV exam.
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2026 California | Frequently Asked Questions
To obtain a CDL Tank endorsement in California, you must first have a Commercial Driver's License (CDL). Then, study the California CDL handbook's section on Tank Vehicles to prepare for the written test. Schedule and pass the written test at your local DMV. Once passed, you'll receive your Tank endorsement, allowing you to drive commercial tank vehicles.
To obtain a CDL Tank license, it's essential to first have a Commercial Driver's License (CDL). You must also study the tank vehicle section of the CDL handbook, pass a written test specific to tank vehicles, and pay the required fees. Knowledge of inspection procedures, driving techniques, and handling emergencies is crucial.
While California doesn't specifically mandate training or experience for a CDL Tank endorsement, it's highly recommended. Understanding the operation of tank vehicles, safety procedures, and how to handle emergencies is crucial. Studying the tank vehicle section of the CDL handbook and gaining practical experience will greatly improve your chances of passing the endorsement test.
Yes, to obtain a CDL Tank endorsement in California, you must pass the Tank Vehicle endorsement test. This written exam covers topics such as the inspection of tank vehicles, driving tank vehicles, and safe driving rules. It's an additional test beyond the general CDL exam and is required for the endorsement.
The written test for a CDL Tank endorsement covers subjects such as inspecting tank vehicles, safe driving for tank vehicles, and handling emergencies. This includes understanding the high center of gravity in these vehicles, the impact of liquid surge on vehicle control, and procedures for loading and unloading. Knowledge of specialized laws relating to tank vehicles is also tested.
The CDL Tank endorsement assessment doesn't involve a specific skills test or maneuvers like the basic CDL exam. Instead, it focuses on a written test that assesses your understanding of tank vehicle operations. This includes knowledge of safe driving techniques, handling liquid surge, emergency procedures, and how to properly inspect and maintain tank vehicles.
Yes, drivers with a CDL Tank endorsement must follow specific rules. These include weight restrictions for the vehicle, following hours of service regulations, and restrictions on hazardous materials transport if the driver doesn't hold a Hazmat endorsement. Violations can lead to CDL disqualification. It's crucial to understand and follow these regulations to maintain the endorsement.
No, drivers cannot transport liquid or gas materials without a valid CDL Tank endorsement. This endorsement is required for operating a commercial vehicle that is designed to transport any liquid or gaseous materials within a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1,000 gallons or more.
The CDL Tank endorsement can be added to your existing CDL. You don't need to apply for a new license. However, you will need to pass the Tank Vehicle written knowledge test. Once you pass, the Tank endorsement will be added to your current CDL, expanding the types of vehicles you're authorized to drive.
Yes, to handle hazardous materials with a CDL Tank endorsement, you must also have a Hazardous Materials (Hazmat) endorsement. This requires passing an additional written test and a Transportation Security Administration background check. It ensures drivers understand safety protocols for handling hazardous materials, reducing the risk of incidents.
