Class A CDL Pre-Trip Inspection Tractor Trailer

The purpose of this inspection is to make sure the vehicle is safe to operate, and to see if you have the
knowledge and skills to inspect your vehicle.
You may have to walk around the vehicle and point to or touch each item and explain to the examiner
what you are checking and why. You will not have to crawl under the hood or under the vehicle.

FRONT OF THE TRACTOR

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SIDE OF THE TRACTOR

Front Wheels:
Tires
• Do not use recap
• No any bubbles
• No any cuts on it
• No any space between rims and tires.
• Air pressure must be 80-100 PSI
• In the front tire’s dept of treed must be four thirty seconds of inch (4/32”)

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ENGINE COMPARTMENT - DRIVER SIDE

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ENGINE COMPARTMENT - PASSENGER SIDE

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FRONT SUSPENSION

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FRONT BRAKES

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slack adjuster
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Air Brake Diagram

TRACTOR COUPLING AREA

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air lines
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exhaust system and drive shaft

FRONT OF TRAILER

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REAR (DRIVE) WHEELS

Tires:
• Can be recap (We must be sure that no any separation between recap and original tire.)
• No any bubbles
• No any cuts on it
• No any space between rims and tires.
• Air pressure must be 80 - 100 PSI
• In the front tire’s dept of treed must be four thirty seconds of inch (2/32”)
• No any objects between wheels, no any stone, no any bottle.

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DRIVE AXLE SUSPENSION

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DRIVE BRAKES

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COUPLING SYSTEM

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SIDE OF TRAILER

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TRAILER SUSPENSION

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TRAILER BRAKES

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TRAILER WHEELS

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REAR OF TRAILER

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IN CAB INSPECTION

Emergency Equipment:
- Spare minimum three electrical fuses
(unless vehicle has circuit breaker)
- Three reflective triangles
• Must be red and in good condition

- Fire extinguisher
• Must be ABC or BC type
• Fully charged
• Safety pin must be present
• Sticker must be valid
• Securely mounted

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Safety Belt:
• Latches securely
• Mounted securely
Steering Wheel:
• No more than 10 degrees or 2 inches of free play
Clutch pedal:
• Engages and disengages smoothly
• Free play maximum 1.5 inch
• Rubbered
Foot (Service) brake:
• No stick to the floor
• Rubbered

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Accelerator:
• No stick to the floor
Shifter:
• Moves in and out of gear properly
• Range selector works
Water Temp Gauge:
• Gauge is working (170 – 210 degrees)
Oil Pressure Gauge:
• Gauge is working properly
• Normal oil pressure (20 - 45 PSI)
• Check that the warning light goes out
Ammeter/voltmeter:
• Gauge shows 12 – 14 volts

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Lighting Indicators:
• Left and right turn signal
• 4-Way Flashers
• High beam indicator
Horns:
• Electric (Street) horn works properly
• Air horn works properly
• Min one must be working
Heater & Defroster:
• Move switch from heat to defrost
• Check for air flow

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Windshield:
• Clean and free of obstruction
• Not cracked or broken
Wipers & Washer:
• Working
• Mounted securely to wiper arm
• Rubber not torn
• Washer sprays properly
Mirrors:
• Clean
• Adjusted

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CHECK SERVICE, EMERGENCY AND PARKING BRAKES

Air leak test (static)
1. Air pressure must be maximum (120-130psi)
2. Transmition: 1st gear
3. Turn engine OFF
4. Release parking brakes (yellow, red knobs IN)
5. Do not touch break pedal, wait one minute, check air pressure loss is no more then 3 PSI
Air leak test (applied)
1. Air pressure must be minimum of 90psi
2. Transmition: 1st gear
3. Engine is OFF
4. Parking brakes released (yellow, red knobs IN)
5. Depress and hold break pedal one minute air leakage must be not more then 4 PSI

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Low pressure warning device test
1. Air pressure must be maximum (120-130 PSI)
2. Transmition: 1st gear
3. Engine is OFF, ignition is ON
4. Release parking brakes (yellow, red knobs IN)
5. Pump brake pedal, release (fan down)
Buzzer + red light on by 60 PSI

Spring brake pop-out test
1. Air pressure must be minimum 60 PSI
2. Transmition: 1st gear
3. Engine is OFF
4. Parking brakes released (yellow, red knobs IN)
• Pump brake pedal (fan DOWN)
• Tractor (yellow) and trailer (red) must pop-out between 20-40 PSI
• Trailer (red) pop-out first to avoid jackknife of trailer

Slack adjuster check
1. Park on level ground.
2. Apply parking brakes.
3. Put transmition on first gear.
4. Turn engine OFF and put key in the pocket.
5. Block the wheels (place chock)
6. Release parking brakes.
7. Check free play on slack adjuster manually.
If it is more then 1 inch, then must be adjusted.

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