CDL Pre-Trip Questions ( Updated 2024 ) Complete Questions & Answers (Solved) 100% Correct
- What is being inspected when you pump the pedal three times and hold down for five
seconds making sure that the pedal should not move during the five seconds?
Answer: Hydraulic brake
- What carries air or hydraulic fluid to the wheel brake assembly?
Answer: Brake hoses/lines
- What are either gas or hydraulic devices that cushions the vehicle ride, stabilizes the vehicle
and should be secure and have no leaks?
Answer: Shock absorbers
- What should you make sure is secured, cap(s) are on tight and has no leaks from the bank(s)
or lines?
Answer: Fuel tank
- What maintains air pressure in the air brake system?
Answer: Air compressor/belt
- What disengages the engine from the drive train so the vehicle won't move and reduce the
load on starting the motor?
Answer: Clutch/gearshift
- What are you inspecting by making sure that hose and lines are not cut, chafed, spliced,
worn and not tangled, pinched or dragging against tractor parts?
Answer: Air/electric lines
- What should be fully engaged, with no loose or missing pins in the slide mechanism of the
sliding fifth wheel?
Answer: Locking pins
9. To check the coolant level:
Answer:
You would inspect the reservoir sight glass OR Remove the radiator cap and check the level visibly
- What are the brackets, bolts or bushing that are used to attach spring and/or air bag to the
axle and vehicle frame?
Answer: Mounting bolts
- What, if loose or missing, may cause movement between the frame and fifth wheel
assembly? 1 / 2
Answer: Mounting bolts
- If worn, what can cause excessive heat buildup from the reduced ability to absorb and
dissipate heat, possibly leading to loss of brake response?
Answer: Brake drum/lining
- The best way to check for loose lugs is to
Answer: use a lug wrench
- Regarding the buildup of air pressure as reflected by the air pressure gauge, if the buildup
of air pressure is okay (adequate), the time needed for the air pressure to build from 85 to 100 psi (586 to 690 kPa) is
Answer: 45 seconds
- Rust around the lugs is most often a sign
Answer: the lugs are loose.
- For a vehicle with a power steering system and a 20-inch steering wheel, if steering wheel
lash is , the vehicle will be considered out of service.
Answer: 5-1/4 inches or greater
- The proper way to check air tanks for oil is .
Answer: to open the petcocks and allow the tanks to drain.
- After the air brake system is fully charged, with the engine off, the parking brake and
trailer brakes released, and firm pressure (about 90 psi) applied to the service brake pedal for 1 minute, for a tractor and trailer the air pressure drop should be
Answer: no more than 4 psi.
- The tractor protector valve should automatically go from the normal to the emergency
position when the air pressure is .
Answer: no less than 20 pounds and no more than 45 pounds.
- You must stop and do an en route walkaround safety inspection
Answer: every 150 miles or 3 hours (whichever comes first) during a trip.
- Air/Electric Connectors
Answer: Glad hands and electrical plug are firmly seated and there are no audible leaks.
- Alternator Belt
- / 2
Answer: Drives the generator and is not frayed, cracked, and is snug. No more than 3/4 of an inch give.