Vehicle Equipment & Safe Operation — Oklahoma
Oklahoma CDL practice test: 421 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Vehicle Equipment & Safe Operation: 169 questions.
Brakes, tires, lights, mirrors, seat belts, child seats and basic vehicle control.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Vehicle Equipment & Safe Operation |
| License test | Oklahoma CDL permit (CLP) knowledge tests |
| Topic questions | 169 (40% of 421 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
Not yet verified
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Questions (169)
1. When braking with ABS, you should:
- Push the brake pedal harder than usual.
- Push the brake pedal as you normally would. ✓
- Push the brake pedal more lightly than usual.
Answer: B. Push the brake pedal as you normally would.
2. Which of the following is not a reason to use your mirrors?
- You are changing lanes.
- You are making a turn.
- You are looking at fuel prices. ✓
Answer: C. You are looking at fuel prices.
Looking at fuel prices is not a reason to use your mirrors. The handbook treats mirrors as a driving tool: you glance in them quickly, look back and forth between the mirrors and the road ahead, and never stare at them, because focusing on a mirror too long means you cover distance without knowing what is happening in front of you. It also mentions checking the mirrors for signs of smoke from tires or the vehicle. Watching prices at the roadside has nothing to do with either job, and it would pull your attention away from the road in exactly the way the handbook warns against.
3. What does an Anti-Lock Braking System (ABS) do?
- It allows a vehicle's wheels to lock up.
- It prevents a vehicle's wheels from locking up. ✓
- It makes turning a vehicle easier.
Answer: B. It prevents a vehicle's wheels from locking up.
4. Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:
- Stop the compressor from pumping air. ✓
- Release air from the tanks.
- Begin pumping air into the tanks.
Answer: A. Stop the compressor from pumping air.
At about 125 psi, the governor stops the air compressor from pumping air into the tanks. The handbook describes the governor as the control that decides when the compressor pumps. It states that when tank pressure reaches the cut-out level, around 125 psi, the governor stops the compressor from pumping. It also states that the governor lets pumping start again when pressure falls to the cut-in level, around 100 psi. That matches the bank answer: at 125 psi the compressor is stopped, not allowed to keep adding air.
5. In the case of an engine fire, you should not:
- Turn off the engine as soon as possible.
- Shoot foam through the louvers.
- Open the hood. ✓
Answer: C. Open the hood.
Do not open the hood when there is an engine fire. The handbook's engine-fire steps say to shut the engine down promptly, leave the hood closed when you can, and put foam through the louvers, radiator, or the underside. Opening the hood is the action it tells you to avoid. So the choice to reject is opening the hood; the other two actions are part of the recommended response. The passage does not give a separate engine-fire reason for keeping the hood shut, but it does warn that letting air into a cargo fire makes it burn fast.
6. Once cargo is secured onto a vehicle:
- You do not need to inspect the cargo.
- You should not let others inspect the cargo.
- You should check the cargo every 150 miles. ✓
Answer: C. You should check the cargo every 150 miles.
You should check the cargo every 150 miles. The handbook says that after cargo is secured, the driver must inspect the securement within the first 50 miles of the trip and then every 150 miles or every three hours, whichever comes first. Another passage repeats that you need to inspect again after driving for 3 hours or 150 miles, and after every break. So regular re-checking at 150-mile intervals is part of keeping the load secure, not something you can skip once the cargo is tied down.
7. When the spring brakes are on, you should never:
- Turn on the lights.
- Turn off the vehicle.
- Push down the brake pedal. ✓
Answer: C. Push down the brake pedal.
You should never push down the brake pedal while the spring brakes are on. The handbook's spring brake section says the springs hold the brakes on by mechanical force. If you also press the brake pedal, the spring force and air pressure can combine and damage the brakes. Some systems are built to prevent that, but not all are, and even those may not always work. Because of that, the handbook advises making it a habit not to press the pedal when the spring brakes are applied.
8. Rust around wheel nuts may mean:
- The nuts are too tight.
- The nuts are loose. ✓
- The tires should be replaced.
Answer: B. The nuts are loose.
Rust around wheel nuts may mean the wheel nuts are loose, so you should check their tightness. The handbook lists rust around wheel nuts as a possible sign that the nuts are loose and tells you to check tightness. Its lug nut inspection also says to look for rust trails or shiny threads that may show looseness. That makes rust a warning to verify the nuts are snug, not a reason to assume the tires need replacing or that the nuts are too tight.
9. An Anti-Lock Braking System (ABS) will:
- Shorten your stopping distance.
- Not change the way you apply the brakes. ✓
- Allow you to drive faster.
Answer: B. Not change the way you apply the brakes.
The correct choice is that ABS will not change the way you apply the brakes. The handbook says ABS does not change your normal braking. Under ordinary brake conditions, the vehicle stops as it always did, and ABS only steps in when a wheel would have locked because of overbraking. It is an add-on to your regular brakes, not a replacement, and it does not always shorten stopping distance. That is why the answer is the choice about not changing how you apply the brakes, rather than stopping distance or speed.
10. Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.
- Green
- Blue
- Yellow ✓
Answer: C. Yellow
The ABS malfunction lamps are yellow. The handbook says vehicles with ABS have yellow malfunction lamps that tell you if something is not working. It also says tractors, trucks, and buses have these yellow ABS lamps on the instrument panel, while trailers have them on the left side, front or rear corner. That direct description of the lamp color supports choosing yellow for the malfunction lamp.
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Source
Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook