Vehicle Equipment & Safe Operation — Kansas
Kansas CDL practice test: 397 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: 190 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 | Kansas CDL permit (CLP) knowledge tests |
| Topic questions | 190 (48% of 397 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 (190)
1. Parking brakes:
- Should not be tested.
- Should be tested, but only after driving a distance.
- Should be tested before a drive. ✓
- Should be tested on a hill.
Answer: C. Should be tested before a drive.
2. When checking your tires, which of the following is not an issue to correct?
- Too much air pressure
- Too little air pressure
- Radial and bias-ply tires used together
- Tread depth of at least 4/32 of an inch on the front tires ✓
Answer: D. Tread depth of at least 4/32 of an inch on the front tires
A tread depth of at least 4/32 inch on the front tires is not an issue to correct; it is the required minimum. The handbook's tire checklist lists too much or too little air pressure and radial and bias-ply tires used together among the problems to find and fix. It separately states that front tires need at least 4/32 inch of tread depth in every major groove. So meeting that front-tire tread minimum is a requirement, not a defect. The question asks what is not an issue to correct, and the stated minimum tread depth fits that.
3. When using a turn signal, you should not:
- Signal early.
- Signal continuously.
- Cancel the turn signal after completing the turn.
- Allow the turn signal to stay on long after the turn has been completed. ✓
Answer: D. Allow the turn signal to stay on long after the turn has been completed.
You should not let the turn signal stay on long after you finish the turn. The handbook lists three rules for turn signals: signal early, before you turn; keep the signal on continuously through the turn, because you need both hands on the wheel and should not cancel it until the turn is done; and then turn the signal off once you have turned, unless your vehicle has self-canceling signals. Letting it keep blinking well past the turn breaks that third rule, since the signal is meant to warn others about the turn you are making, not one you already made.
4. Air pressure in the ____ air line is controlled by either the foot brake or trailer hand brake.
- Emergency
- Service ✓
- Rear
- Auxiliary
Answer: B. Service
The service air line is the line whose pressure is controlled by either the foot brake or the trailer hand brake. The service air line is the one whose pressure changes when you use the foot brake or the trailer hand brake. The handbook describes the service line, also called the control or signal line, as carrying air controlled by those two controls. It adds that pressure in the service line tells the relay valves how much pressure to send to the trailer brakes, and that this pressure is controlled by the brake pedal and the trailer hand brake. That matches the question directly, so the service line is the correct answer.
5. Most heavy-duty vehicles use:
- Single air brake systems.
- Dual air brake systems. ✓
- Triple air brake systems.
- Quadruple air brake systems.
Answer: B. Dual air brake systems.
Most heavy-duty vehicles use dual air brake systems. The handbook states plainly that heavy-duty vehicles use dual air brake systems for safety. It then describes how they work: two separate systems sharing one set of brake controls, each with its own tanks, hoses, and lines. Usually one system runs the regular brakes on the rear axle or axles, and the other runs the regular brakes on the front axle. The reason given is safety, since the two systems are separate.
6. Front brake limiting valves were intended to:
- Prevent the front tires from skidding. ✓
- Prevent the front tires from overheating.
- Create equal brake usage.
- Remove uncertainty when applying the brakes.
Answer: A. Prevent the front tires from skidding.
Front brake limiting valves were intended to prevent the front tires from skidding. The handbook explains that some older vehicles have a front brake limiting valve with a cab control marked "normal" and "slippery." In the slippery setting, the valve cuts normal air pressure to the front brakes by half. The passage states plainly that limiting valves were used to reduce the chance of the front wheels skidding on slippery surfaces. The same passage notes they actually cut stopping power, that front wheel braking is good in all conditions, and that you should keep the control in the normal position.
7. Hydraulic brakes can fail due to:
- A loss of pressure. ✓
- Cold weather.
- Driving uphill for long periods of time.
- Grooves in the roadway.
Answer: A. A loss of pressure.
Hydraulic brakes can fail because of a loss of pressure. The handbook says well-maintained brakes rarely fail, and it names two common causes of hydraulic brake failure: losing hydraulic pressure and brake fade on long hills. When the system cannot build pressure, the pedal may feel spongy or sink to the floor. That directly supports pressure loss as a cause. Cold weather, uphill stretches and road grooves are not given as causes in the passages.
8. When backing a trailer, how should you turn the steering wheel?
- Turn the top of the steering wheel in the direction you want the trailer to go.
- Turn the top of the steering wheel in the direction opposite of where you want the trailer to go. ✓
- It doesn’t matter.
- It depends on where the trailer is being backed.
Answer: B. Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
Turn the top of the steering wheel opposite the direction you want the trailer to go. The handbook draws a clear contrast: with a car, straight truck, or bus, you steer the top of the wheel toward where you want to go, but a trailer reverses that. You turn the wheel away from the trailer's intended direction. After the trailer begins turning, the handbook says to turn the wheel the other way so the vehicle follows it. The rule applies whenever you back a trailer; choosing a straight line or backing toward your side affects setup and visibility, not the basic steering direction.
9. Applying the brake pedal causes air pressure to activate an electric switch and:
- Turn off the brake lights.
- Turn on the low pressure warning light.
- Turn on the brake lights. ✓
- Turn off the low pressure warning light.
Answer: C. Turn on the brake lights.
Applying the brake pedal turns on the brake lights. The handbook says drivers behind you must be warned when you put your brakes on. In an air brake system, an electric switch works by air pressure and turns on the brake lights when you apply the air brakes. That is why the brake pedal application leads to the brake lights coming on.
10. On a truck with air brakes, the braking system’s air compressor:
- Pumps air into the air storage tanks. ✓
- Fills the tires.
- Moves air to the back of the truck.
- Cleans the brakes.
Answer: A. Pumps air into the air storage tanks.
The air compressor is the part that sends air into the air storage tanks. The handbook describes the air compressor as the part that sends air into the air storage tanks, which it also calls reservoirs. That matches the choice saying it pumps air into the tanks. The governor only decides when the compressor runs, stopping it at the cut-out pressure and letting it start again at the cut-in pressure. The tanks then hold compressed air for brake use. So the compressor's job is to supply the storage tanks, not to inflate tires or clean brake parts.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook