Air Brakes #2
Air Brakes Endorsement Test | Virginia 2025 #2 Page 3 of 4
Train for FREE online with our Virginia CDL air brake 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 VA Class A/Class B driver license in 2025, 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 the requirements for CDL may vary from state to state.
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13 . An alcohol evaporator in an air brake system:
Some air brake systems include an evaporator that introduces alcohol into the system. The alcohol can help prevent ice from forming within the system.
14 . What can happen if the air pressure gets too low in an air brake system?
Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low.
15 . Why do large vehicles use air brakes?
If used and maintained properly, air brakes are a safe and effective way to stop large, heavy vehicles.
16 . If the air pressure in an air brake system becomes too low, it may:
If the pressure in an air brake system becomes too low, the brakes will no longer work. If the low pressure warning signal activates, you should leave the road and stop safely while you still have braking power.
17 . The ____ are activated by an electric switch that is triggered by the brake pedal.
In a vehicle with air brakes, the brake lights are activated when the brake pedal is pushed and air pressure moves an electric switch. With the application of air pressure, the switch will then turn on the brake lights.
18 . An alcohol evaporator is especially important:
Some air brake systems contain an alcohol evaporator. This evaporator introduces alcohol into the system to help prevent ice from forming in cold weather.
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2025 Virginia | Frequently Asked Questions
In Virginia, to secure a CDL Doubles/Triples endorsement, you must have a valid Commercial Driver's License (CDL). Start by studying the appropriate section in the Virginia CDL manual. Then, pass the written knowledge test at a DMV customer service center. You must also pass a skills test in a vehicle representative of the type you'll be driving.
To obtain a CDL Doubles/Triples license, you need a valid Commercial Driver's License (CDL). You must study the Doubles/Triples section in the CDL manual, pass a written knowledge test at your local DMV, and complete a skills test in a vehicle similar to what you plan to drive. This endorsement is required to drive vehicles pulling two or three trailers.
While Virginia doesn't mandate specialized experience or training for a CDL Doubles/Triples endorsement, it's recommended. You must have a valid CDL, pass the written knowledge test, and successfully complete a skills test in a representative vehicle. Practical training can help with these tests and safely operating such vehicles. Always check with your local DMV for specific requirements.
Yes, to obtain a CDL Doubles/Triples endorsement in Virginia, you must pass an additional written knowledge test specifically for this endorsement. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and managing cargo. The test is based on the Doubles/Triples section in the CDL manual. No extra driving exam is required if you already hold a CDL.
For the CDL Doubles/Triples endorsement in Virginia, you don't have to perform a specific driving test. However, the written test covers important topics including coupling/uncoupling procedures, inspecting doubles/triples, and managing cargo. Understanding these skills is critical for safety. It's beneficial to practice these maneuvers even though they are not part of a specific driving test.
No, it's not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Virginia. The endorsement is a legal requirement that ensures you have the necessary knowledge and skills to safely operate such vehicles. Driving without the proper endorsement can result in hefty fines and penalties.
In Virginia, you can add the CDL Doubles/Triples endorsement to your existing commercial driver's license. You don't need to initiate a new application for a CDL. However, you'll need to pass the Doubles/Triples knowledge test and pay an applicable fee to add this endorsement to your current CDL.
Yes, even with a CDL Doubles/Triples endorsement, there are restrictions. In Virginia, drivers can only operate doubles/triples on specific highways and during certain hours. Also, the total weight of the trailers cannot exceed the Gross Vehicle Weight Rating. Drivers must also comply with all federal and state laws regarding rest periods and hours of service.
In Virginia, the maximum weight limit for double/triple trailers is 80,000 pounds. The maximum length for a double trailer is 61 feet for the two trailers combined, while the maximum length for a triple trailer combination is 75 feet. These limits can vary depending on the road type and may be subject to change based on state regulations.
Yes, there are specific safety guidelines for driving double/triple trailers. Drivers must ensure the securement of the cargo and conduct pre-trip inspections. They must also maintain a safe following distance, avoid sudden stops or lane changes, and understand the high rollover risk. Virginia adheres to Federal Motor Carrier Safety Regulations, which provide extensive safety rules for commercial vehicles.
