On flatbed trailers and trailers without sides, cargo must be tied down to prevent it from shifting or falling off in transit.

Are usually heavy enough to not need to be strapped down.

Should not be strapped down if you are driving more slowly than 35 mph.

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.

Prevent the front tires from skidding.

Prevent the front tires from overheating.

Remove uncertainty when applying the brakes.

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.

The air pressure has become too high.

The brakes are fully operational.

Cargo inside a trailer must be secured appropriately to prevent it from shifting in transit.

Should be secured to prevent movement.

Should be stacked no more than three feet high.

Should be secured to prevent movement.

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.

Hold the brake pedal down as far as it will go.

Class B Driving Test | Alabama 2026 #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 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 CDL class B requirements may vary from state to state.

Number of Question 50

Passing Score 40

Number of Tests 20

Class B Driving Test | Alabama 2026 #2 Page 7 of 7

43 . What is often found in compressed air?

44 . Items on a flatbed:

45 . If you identify a distracted driver on the road, you should:

46 . The two markings on a front brake limiting valve usually read:

47 . Front brake limiting valves were intended to:

48 . If the safety relief valve in the air brake system releases air:

49 . Cargo inside a trailer:

50 . What should you do if the braking system cannot build up hydraulic pressure?

See the exact questions that will be on the 2026 DMV exam.

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