Class B Driving Test | Alabama 2025 #2 Page 7 of 7
Train for FREE online with our Alabama class B license 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 AL CDL class B permit 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 CDL class B requirements may vary from state to state.
43 . What is often found in compressed air?
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.
44 . Items on a flatbed:
On flatbed trailers and trailers without sides, cargo must be tied down to prevent it from shifting or falling off in transit.
45 . If you identify a distracted driver on the road, you should:
If you encounter a distracted driver, make sure to give them plenty of room. Be very careful if you pass their vehicle because the driver may be unaware of your presence and drift into your lane.
46 . The two markings on a front brake limiting valve usually read:
Some vehicles with air brake systems manufactured before 1975 have a front brake limiting valve with "normal" and "slippery" settings.
47 . Front brake limiting valves were intended to:
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.
48 . If the safety relief valve in the air brake system releases air:
An air brake system has a safety relief valve, which releases air from the tanks if the pressure gets too high. If the valve must operate, something in the system is wrong and should be addressed by a mechanic.
49 . Cargo inside a trailer:
Cargo inside a trailer must be secured appropriately to prevent it from shifting in transit.
50 . What should you do if the braking system cannot build up hydraulic pressure?
If your hydraulic braking system will not build up the pressure needed to slow or stop your vehicle, there are a few possible solutions. Try shifting into a lower gear, pumping the brakes, and/or using the emergency brake.
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