Air Brakes #2
Air Brakes Endorsement Test | Michigan 2025 #2 Page 4 of 4
Train for FREE online with our Michigan 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 MI 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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19 . What do air brakes use to make the brakes work?
Many large CMVs are equipped with air brakes. An air braking system uses compressed air to operate.
20 . The air storage tanks:
The air storage tanks in an air brake system store compressed air to be used for braking. They hold enough air for the brakes to still be used several times if the compressor stops working.
21 . When leaving a vehicle unattended, a driver should:
Always apply the parking brake when leaving your vehicle unattended.
22 . Air pressure should build up in a single air system within:
In single air systems, air pressure should build from approximately 50 to 90 psi within three minutes.
23 . If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.
A visual low pressure warning signal should activate before air pressure drops to a level between 55 and 75 psi. This signal could be a light, a buzzer, or a wig wag.
24 . ____ make up the emergency brake system.
In an air brake system, there are three different braking systems: a service brake system, a parking brake system, and an emergency brake system. The emergency brake system uses parts of both the parking and service brake systems.
25 . Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure levels drop to an unsafe level, the parking brake valve should pop out and spring brakes should come on.
2025 Michigan | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in Michigan, you must already possess a Commercial Driver's License (CDL). Complete a written knowledge test at the Secretary of State office. After passing the test, the endorsement will be added to your CDL. Remember, it's necessary to have a 'T' endorsement to pull double or triple trailers.
To obtain a CDL Doubles/Triples endorsement, you must: 1) Already hold a Commercial Driver's License (CDL), 2) Pass a written knowledge test about the specific skills and knowledge required for driving double and triple trailers, 3) Pay the necessary fees. Once you pass the test, the 'T' endorsement will be added to your CDL.
While specialized experience or training is not a mandatory requirement for a CDL Doubles/Triples endorsement, it is highly recommended. The endorsement test covers specific knowledge about handling double and triple trailers. Therefore, practical experience or training can be beneficial in successfully passing the test and safely operating such vehicles on the road.
Yes, to obtain a CDL Doubles/Triples endorsement, you are required to pass a written knowledge test. This test includes questions about coupling and uncoupling, inspecting doubles and triples, and rules for pulling these types of vehicles. After passing this test, the 'T' endorsement is added to your Commercial Driver's License (CDL).
The CDL Doubles/Triples endorsement test is a written exam, not a driving test, so no specific maneuvers are required. However, the test covers topics like coupling and uncoupling, inspecting doubles and triples, and rules for pulling these vehicles. Knowledge of these areas is essential to pass the test and safely operate such vehicles.
No, it is not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Michigan. Driving these types of vehicles requires specialized skills and knowledge, which are validated by obtaining the endorsement. Operating without the proper endorsement can lead to fines, penalties, and potential loss of your CDL.
You can add the CDL Doubles/Triples endorsement to your existing commercial driver's license in Michigan. You don't need to initiate a new application for a license. However, you must pass the required knowledge test for the endorsement and pay any applicable fees to add it to your current license.
Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. The most notable is that the endorsement only allows you to operate double or triple trailers. Additionally, all standard CDL rules and restrictions still apply, such as obeying traffic laws, maintaining a clean driving record, and passing regular medical examinations to ensure fitness for driving.
In Michigan, the maximum weight for a double/triple trailer is 164,000 pounds, depending on the number of axles and bridge length. The maximum length for a trailer is 53 feet. However, the combined length of a double/triple trailer cannot exceed 59 feet. Please note that these restrictions may vary based on local and federal regulations.
Yes, there are specific safety guidelines for driving double/triple trailers with a CDL Doubles/Triples endorsement. These include maintaining safe following distances, proper coupling and uncoupling of trailers, checking brake systems and lights, and managing high-speed and high-wind conditions. Drivers must also undergo regular drug and alcohol tests as per federal regulations.