Vehicle Equipment & Safe Operation — New Mexico
New Mexico CDL practice test: 411 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: 164 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 | New Mexico CDL permit (CLP) knowledge tests |
| Topic questions | 164 (40% of 411 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
Advertisement
Questions (164)
1. After a tire has been changed, the driver should stop after a short distance to:
- Check the tightness of the lug nuts. ✓
- Ensure that the tire has remained clean.
- Inflate the new tire.
Answer: A. Check the tightness of the lug nuts.
After a tire change, stop a short distance down the road and recheck how tight the lug nuts are. The handbook's wheel and rim section says plainly that once a tire has been changed, you should stop a short while later and check the nuts again for tightness. The same section notes that rust around wheel nuts can be a sign the nuts are loose, so tightness is something you verify by hand. The inspection chapter adds the reason behind that habit: loose or missing lug nuts can let a wheel come off the vehicle, which can cause a crash. Rechecking shortly after the change catches nuts that have started to work loose.
2. Within 10 minutes of stopping on the side of the road, you must:
- Place emergency warning devices. ✓
- Alert local law enforcement.
- Call a mechanic.
Answer: A. Place emergency warning devices.
Within 10 minutes of stopping on the side of the road, you must place your emergency warning devices. The handbook says that if you must stop on a road or shoulder, you have ten minutes to put out your emergency warning devices. It also tells you to turn on four-way flashers when you pull off and stop, and it gives placement locations for the devices. That rule is about warning approaching drivers that your vehicle is there. The passage ties this to parked vehicles being hit because other drivers thought they were moving normally. So the required action within that time is setting out the warning devices.
3. If the safety relief valve in an air brake system is releasing air:
- You should not be concerned as this is a normal process.
- There is something wrong with the brakes. ✓
- The valve is operational.
Answer: B. There is something wrong with the brakes.
If the safety relief valve is releasing air, there is something wrong with the brakes and a mechanic should fix the fault. The handbook places the safety valve in the first tank the compressor fills. Its job is to protect the tank and the rest of the system from too much pressure, and it is usually set to open at 150 psi. The handbook says that if the safety valve releases air, something is wrong and the fault should be fixed by a mechanic. So a release of air is not a normal sign to ignore; it points to a problem in the system.
4. If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.
- 55 and 75 psi. ✓
- 80 and 95 psi.
- 65 and 100 psi.
Answer: A. 55 and 75 psi.
5. What does the air compressor governor do?
- It stops the compressor from pumping air. ✓
- It turns on the air compressor.
- It stores the compressed air.
Answer: A. It stops the compressor from pumping air.
The air compressor governor controls the compressor so that it stops pumping air once tank pressure reaches the cut-out level. The handbook says the governor decides when the compressor pumps air into the storage tanks. When tank pressure climbs to the cut-out level (around 125 psi), the governor stops the compressor from pumping. When pressure drops to the cut-in level (around 100 psi), the governor lets the compressor start pumping again. So its job is to keep tank pressure inside that range, and the stopping action is what the handbook highlights at the top of the range. A governor that does not work properly may not keep enough air pressure for safe driving.
6. What does the vehicle inspection report do?
- Inform the motor carrier about problems that may need fixing ✓
- Ensure that the vehicle is inspected regularly
- Keep people accountable for inspecting the vehicle
Answer: A. Inform the motor carrier about problems that may need fixing
The vehicle inspection report informs the motor carrier about problems that may need fixing. The handbook says the report tells the motor carrier about problems that may need fixing, and it also notes that the report helps the carrier know when the vehicle needs repairs. A copy kept in the vehicle lets the next driver learn about problems found. So the report is a way to pass inspection findings to the carrier, not a schedule or a personal accountability record.
7. During an inspection, slack adjusters on S-cam brakes should not move more than:
- One foot.
- One centimeter.
- One inch. ✓
Answer: C. One inch.
Slack adjusters on S-cam brakes should not move more than about one inch where the push rod attaches. The handbook's air brake walk-around inspection says to park on level ground, chock the wheels, release the parking brakes, and pull hard on each slack adjuster you can reach. If one moves more than about an inch at the point where the push rod attaches, it probably needs adjustment, so you adjust it or have it adjusted. The same passage notes that vehicles with too much brake slack can be very hard to stop, which is the reason the one-inch limit matters during your inspection.
8. If the low air pressure warning signal comes on, you should:
- Continue driving, but have the brakes repaired within a week.
- Pull over and inspect the brakes. ✓
- Phone a mechanic while driving.
Answer: B. Pull over and inspect the brakes.
9. ABS helps you:
- Lock up your wheels.
- Keep your wheels from locking up. ✓
- Count the number of students boarding the bus.
Answer: B. Keep your wheels from locking up.
ABS helps you keep your wheels from locking up. The handbook explains that hard braking on slippery surfaces without ABS can lock your wheels. If the steering wheels lock, you lose steering control; if other wheels lock, you may skid or spin. ABS is designed to help you avoid that wheel lockup and stay in control. The handbook also notes ABS may not shorten stopping distance, but it lets you steer around an obstacle while braking and helps avoid skids from overbraking.
10. To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
- Pump the air brakes to activate the ABS.
- Look into the back of the fifth wheel.
- Check for wheel speed sensors coming from the back of the brakes. ✓
Answer: C. Check for wheel speed sensors coming from the back of the brakes.
To check whether a pre-1998 vehicle has ABS, look under it for wheel speed sensors and wires coming from the back of the brakes. The handbook says older towed units can be hard to identify, so you should look under the vehicle for the electronic control unit and wheel speed sensor wires at the back of the brakes. It also explains that ABS is a separate system that only works when wheels are about to lock, so you cannot confirm it just by working the brakes. The wiring and sensor check is the concrete inspection method the handbook gives.
Advertisement
Source
Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook