Pre-Trip Inspection Practice Questions
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- No more than 4 pounds in one minute
- It should not be a concern
- No more than 2 pounds in one minute
- No more than 3 lbs in one minute
From The CDL Manual
System Leak Check:
Shut off the engine, chock your wheels, (if necessary), release the tractor protection valve and parking brake (push in), fully apply the foot brake and hold it for one minute.
Check the air gauge to see if the air pressure drops more than 3 pounds in one minute (single vehicle) or 4 pounds in one minute (combination vehicle). After checking the brake with brake applied, release the foot brake and watch the gauges with brake unapplied for one minute.
Check to see if the air pressure drops more than 2 pounds in one minute (single vehicle) or 3 pounds in one minute (combination vehicle).
- To zero
- More than 20 psi
- Below 60 psi
- Below 20 psi
From The CDL Manual
Emergency System Check/Fan Down:
Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi.
Continue to fan off the air pressure. Normally within the range of 20-40 psi on a tractor-trailer combination vehicle, the tractor protection valve and parking brake valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
- You should leave the truck
- The truck must be serviced
- Low air warnings should come on
- The parking brake should engage
From The CDL Manual
Emergency System Check/Fan Down:
Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi.
Continue to fan off the air pressure. Normally within the range of 20-40 psi on a tractor-trailer combination vehicle, the tractor protection valve and parking brake valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
- Pull forward at 5 mph, and apply the brakes
- Pull forward at 15 mph, and pump the pedal furiously
- Pull forward quickly, and push down hard on the pedal
- Let the truck roll down a steep incline, and gently apply the brakes
From The CDL Manual
Service Brake Check:
You will be required to check the application of air or hydraulic service brakes. This procedure is designed to determine that the brakes are working correctly and that the vehicle does not pull to one side or the other.
Pull forward at 5 mph, apply the service brake and stop. Check to see that the vehicle does not pull to either side and that it stops when brake is applied.
- Missing bolts or nuts
- Secure mounting
- You should be looking for all of these things
- Leaks or damaged hoses
From The CDL Manual
Steering Box/Hoses:
Check that the steering box is securely mounted and not leaking. Look for any missing nuts, bolts and cotter keys.
Check for power steering fluid leaks or damage to power steering hoses.
- All of these things must be thoroughly inspected for any kind of wear or damage
- Shock absorbers
- Springs
- Suspension mounts
From The CDL Manual
Suspension —
Springs/Air/Torque:
- Look for missing, shifted, cracked or broken leaf springs.
- Look for broken or distorted coil springs.
- If vehicle is equipped with torsion bars, torque arms or other types of suspension components, check that they are not damaged and are mounted securely.
- Air ride suspension should be checked for damage and leaks.
Mounts:
Look for cracked or broken spring hangers, missing or damaged bushings and broken, loose or missing bolts, u-bolts or other axle mounting parts. (The mounts should be checked at each point where they are secured to the vehicle frame and axle(s)).
Shock Absorbers:
See that shock absorbers are secure and that there are no leaks.
- Brake linings should be very thin
- Brake linings should not be worn thin
- They should be free of contaminates
- There should be no cracks, dents, or holes
From The CDL Manual
Drum Brake:
- Check for cracks, dents or holes. Also check for loose or missing bolts.
- Check for contaminates such debris or oil/grease.
- Brake linings (where visible) should not be worn dangerously thin.
- Are acceptable for use
- Require a special permit
- Are acceptable if there are 2 or less repairs
- Are prohibited
From The CDL Manual
Wheels —
Rims:
Check for damaged or bent rims. Rims cannot have welding repairs.
- 4/32-inch
- 2/32-inch
- 1/8-inch
- 1/32-inch
From The CDL Manual
Tires:
The following items must be inspected on every tire:
- Tread depth: Check for minimum tread depth (4/32 on steering axle tires and 2/32 on all other tires).
- Tire condition: Check that tread is evenly worn and look for cuts or other damage to tread or sidewalls. Also, make sure that valve caps and stems are not missing, broken or damaged.
- Tire inflation: Check for proper inflation by using a tire gauge or a mallet. Note: You will not get credit if you simply kick the tires to check for proper inflation.
- That there is no mismatch tires (size and construction).
- Re-grooved or re-capped tires not permitted on bus steer tires.
- Trailer tires
- Steer tires
- Rear tires
- All tires
From The CDL Manual
Tires:
The following items must be inspected on every tire:
- Tread depth: Check for minimum tread depth (4/32 on steering axle tires and 2/32 on all other tires).
- Tire condition: Check that tread is evenly worn and look for cuts or other damage to tread or sidewalls. Also, make sure that valve caps and stems are not missing, broken or damaged.
- Tire inflation: Check for proper inflation by using a tire gauge or a mallet. Note: You will not get credit if you simply kick the tires to check for proper inflation.
- That there is no mismatch tires (size and construction).
- Re-grooved or re-capped tires not permitted on bus steer tires.
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