Air Brakes #2
Air Brakes Endorsement Test | Tennessee 2026 #2 Page 4 of 4
Train for FREE online with our Tennessee 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 TN Class A/Class B driver 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 the requirements for CDL may vary from state to state.
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19 . Dollies equipped with ABS are required to have malfunction lamps located where?
On the top
A dolly equipped with an Anti-Lock Braking System (ABS) is required to have a yellow malfunction lamp located on its left side.
20 . The air pressure in a dual air brake system should build from 85 to 100 psi within:
45 seconds.
When inspecting a vehicle with a dual air brake system, you should wait for air pressure to build from 85 to 100 psi in both the primary and secondary systems. This should take about 45 seconds.
21 . Why do you need to drain air tanks regularly?
To remove bad air from the tanks
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
22 . Brake linings should be:
Brake linings should not be loose or soaked with oil or grease. They shouldn't be dangerously thin.
23 . Front brake limiting valves were intended to:
Remove uncertainty when applying the brakes.
Some older vehicles with air brakes have front brake limiting valves. These valves were intended to reduce the risk of front wheels skidding. However, research has shown that such devices are unnecessary, so they should be left in the "normal" position.
24 . Air tank drains:
Must remain open while driving.
In an air brake system, the air tanks are equipped with drains that allow water and compressor oil to be removed from the system. If allowed to build up, water and compressor oil can damage an air brake system.
25 . The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
A one-way check valve is required to be between an air compressor and the first main reservoir. This valve prevents air from escaping the system if the air compressor develops a leak.
2026 Tennessee | Frequently Asked Questions
To secure a CDL Bus endorsement in Tennessee, you must first hold a valid Commercial Driver's License (CDL). Then, pass the Passenger Vehicles endorsement written test, which covers topics like vehicle inspection, loading/unloading passengers, and emergency procedures. After passing the written test, you'll need to pass a skills test in a vehicle similar to the one you'll be driving.
To obtain a CDL Bus license in Tennessee, you need to have a valid driver's license, pass the CDL general knowledge test, and the passenger endorsement test. You also need to pass a medical examination, provide proof of residency and identity, and complete a skills test in the type of vehicle you will be driving. Finally, you must pay the required fees.
Yes, specific training is necessary for a CDL Bus endorsement in Tennessee. Applicants must pass the Passenger Vehicles endorsement written test and a skills test in a vehicle similar to the one they'll be driving. While not required by the state, many choose to attend a professional training school to prepare for these tests and gain practical driving experience.
CDL Bus licenses fall under three classifications: Class A, B, and C. Class A is for vehicles with a combined weight over 26,001 pounds, where the vehicle being towed is over 10,000 pounds. Class B is for single vehicles over 26,001 pounds or towing a vehicle not over 10,000 pounds. Class C covers vehicles designed to transport 16 or more passengers (including the driver), or hazardous material transport.
No, you cannot use your personal vehicle for the CDL Bus driving test. The vehicle used for the test must match the class and type of vehicle you will be driving with your CDL. For a bus endorsement, you would need to take the test in a bus-like vehicle. This ensures you can handle the specific type of vehicle safely.
During the CDL Bus driving test in Tennessee, candidates are evaluated on their ability to inspect their vehicle, manage space around their vehicle, control speed and stop, start and move the bus smoothly and safely. They're also assessed on their ability to turn, merge into traffic, back up the bus, navigate intersections and railroad crossings, and respond to emergency situations.
Yes, for a CDL Bus endorsement in Tennessee, applicants must pass a Department of Transportation (DOT) medical examination. This examination assesses physical and mental health to ensure drivers can safely operate a commercial vehicle. Conditions evaluated include vision, hearing, blood pressure, and medical conditions like epilepsy or heart disease that could impact driving ability.
No, it is not permissible to transport passengers without a valid CDL Bus endorsement in Tennessee. The law requires all drivers who operate a vehicle designed to carry 16 or more passengers, including the driver, to have a Commercial Driver's License (CDL) with a Passenger (P) endorsement. Driving without the proper license or endorsement can lead to serious penalties.
You can add a CDL Bus endorsement to your existing commercial driver's license in Tennessee. You don't need to apply for a new license. However, you must pass the passenger transport test, a pre-trip vehicle inspection test, and a skills test. A road skills test in the type of vehicle you'll be driving is also required.
Yes, there are restrictions for drivers with a CDL Bus endorsement in Tennessee. For instance, bus drivers must comply with hours-of-service regulations, which limit the number of hours they can drive without rest. Additionally, they must maintain a clean driving record and pass regular physical examinations. Violations like DUIs or reckless driving can lead to suspension or revocation of the endorsement.