cdl pre trip inspection diagram

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Pre-Trip Inspection Study Guide

Our Pre-Trip Inspection Study Guide has everything you need to prepare for the Class A CDL Pre-Trip Inspection Exam . Our study guide will cover the pre-trip inspection terminology as well as a thorough list of all of the parts you will be inspecting on the vehicle. For each part you will be inspecting there will also be a list of items you will be checking for. Our study guide is broken down into the following sections:

• What You Need to Know About Pre-Trip Inspection

Pre-Trip Inspection Practice Questions

• Pre-Trip Inspection Checklist

Pre-Trip Inspection Videos

Pre-trip inspection printable resources, what you need to know about the pre-trip inspection.

The Pre-Trip Inspection is a thorough inspection of the vehicle and all of its major systems. Inspecting the vehicle before driving each day is a Federal requirement and normally takes about 15 minutes. It must be logged in your logbook as "on duty not driving."

You will have to do thorough safety inspections of the coupling system, the vehicle lights, engine compartment, tires and brakes, the chassis, the fuel tanks, and an in-cab inspection.

The following information is a brief summary of Daniel's Complete Pre-Trip Inspection taken from our oustanding free PDF download:

Engine Compartment

You will be checking the engine compartment for any sort of leaks. You will also be checking to see if all components are properly mounted and secured. None of the mounts must be cracked, bent, or broken.

You will be checking all hoses to make sure they aren't leaking, frayed, or sliced and the fluid levels including the oil level, the coolant, and the power steering fluid.

You must check the components like the water pump, the power steering pump, and the alternator to make sure nothing is leaking, the belts are not frayed, and that everything is properly mounted and secured.

From inside the engine compartment you will also find the steering system, the front suspension system, and the front brake system. All components of these systems must be properly mounted and secured without anything being cracked, bent, or broken. Finally you will be checking the tires, rims, and axle seals to make sure the tires are properly inflated, the rim isn't bent or cracked, and the axle seals are not leaking.

Fuel Tank And Battery Area

You will be standing along the side of the tractor doing a series of checks on the mirrors, fuel tanks, batteries, exhaust system, and more. You will check to make sure nothing is bent, cracked, broken, or leaking.

Check the mirrors, door hinges, door handle to make sure nothing is cracked, bent, or broken. Check to make sure there is no fuel leaking and that the fuel cap is secured and the gasket is not missing.

Check the exhaust system to make sure nothing is cracked, bent, or broken. Check the driveshaft, cat walk, and steps to make sure nothing is cracked, bent, or broken.

Check the frame and crossmembers for structural integrity. Check the air lines going to the trailer to make sure they're properly connected and that there are no abrasions, bulges, or cuts. Make sure the gaskets are present.

Check the suspension system and brakes on the drive axles, making sure nothing is cracked, bent, or broken. Make sure the brake linings are the proper thickness and that the air bags and properly inflated. Inspect the brake chambers, slack adjusters, and pushrods are properly mounted and secure. Not Cracked, Bent, or Broken. With the brakes released and pulled by hand, the Push Rod should not move more than 1 inch.

Check the rims, tires, and axle seals of the drive tires for proper inflation, no leaks around the seal, and the lugs are all present and secured.

Coupling System

You will be standing where the tractor and trailer are connected and you'll start by checking the electrical line and air lines to make sure they're properly mounted and secure at both ends. No abrasions, bulges or cuts. Not leaking air. Make sure the electrical line has no wires exposed. Check the gladhands to make sure the seals are in good condition, no cracks or signs of dry rotting. Not leaking air.

Check the skid plate of the fifth wheel and the apron of the trailer to make sure there is no debris and nothing is cracked, bent, or broken. Make sure the fifth wheel is properly greased. Also make sure there is no gap in between the fifth wheel and the trailer apron once the tractor and trailer are coupled. Make sure the kingpin of the trailer is properly mounted and not cracked, bent, or broken and that the locking jaws of the fifth wheel are properly secured when the tractor and trailer are coupled.

Check the mounting bolts where the fifth wheel attaches to the tractor frame. Make sure there are no missing bolts and that everything is secured properly. Check the locking pin if you having a sliding fifth wheel to make sure it's properly locked into place.

Make sure that there is the proper clearance space between the tractor mudflap and the trailer landing gear so that they don’t hit each other when making a turn.

You will start inspecting the trailer at the head board, which is the front wall of the trailer. Make sure there are no holes or missing rivets. Check the landing gear to make sure it is properly mounted and secure. Not cracked, bent, or broken. Make sure the fully raised and the handle is secure in the cradle when the tractor and trailer are coupled.

Check the frame and crossmembers under the trailer to make sure they're not cracked, bent, or broken. Check the tandem frame and release pins to make sure the frame is in good condition and the release handle and locking pins are in the fully locked position.

You will check the entire suspension and brake system for the trailer tandems the same way you did for the drive axles of the tractor. You will also make sure the mudflaps are properly secured. For dual tires check to see that there is proper space between the tires and there is nothing stuck between the tires.

Check the rear door and hinges to make sure they are properly mounted and nothing is cracked, bent, or broken. Make sure the door seals are not worn, torn, or dry rotted.

Light Check

You will be checking all of the lights and reflectors on both the tractor and the trailer. Check the reflectors and reflective tape to make sure they are properly mounted and secure, not cracked, bent, or broken, and clean and illuminated. Check that you have the proper color of amber to the front and sides, and red to the rear.

Start by turning on your marker lights and headlights. Now walk around the entire truck and trailer and point out the lights. Give the function of the light and the location. You should then ask your examiner to help you check your five functions.

While you're sitting in the drivers seat, the examiner will stand to the front of the truck, then behind the trailer. He will then check your Turn Signals, Four Way Flashers and Brake Lights. You must do each function at every location.

The five locations that you must check your lights:

• Front of the Truck
• Both sides of the Truck
• Rear of the Truck
• Both sides of the Trailer
• Rear of the Trailer

The Five Functions you are checking for:

• Left Turn Signal
• Right Turn Signal
• Four Way Flashers
• High Beams/Low Beams
• Brake Lights

In-Cab Inspection

The in-cab inspection and air brake check will cover the various gauges and systems inside the cab along with several tests to make sure you air brake system is working properly.

You will start by checking the following:

• Seat Belt- Properly Mounted and Secure. Not ripped or frayed Adjusts and latches properly.
• Fire Extinguisher- Properly Mounted and Secure. Fully charged
• Three Red Reflective Triangles- My three red reflective triangles are GIVE LOCATION
• Spare Electrical Fuses- My spare electrical fuses are GIVE LOCATION
• Volmeter, Oil Pressure Gauge, Water Temperature Gauge, and Air Pressure Gauge all show proper operation
• City horn and air horn functioning properly
• The windshield and mirrors are clean, no cracks or breaks, no obstructions. The mirrors are in proper adjustment.
• Windshield Wipers and Washers - Demonstrate that the washers work by spraying the windshield. The Wipers are: Properly Mounted and Secure and operate smoothly. The blades aren't cracked or dry rotten.
• Heater and Defroster - Demonstrate that both the Heater and Defroster are working properly.
• Lighting Indicators - Left Turn, Right Turn, Four Way Flashers, and High Beams.

Trailer Parking Brakes - Set the Trailer Brake, release the tractor brake, and then tug lightly on the trailer.

Tractor Parking Brakes- Then set the Tractor Brake, release the trailer brake, and then tug lightly on the tractor.

Service Brake Check - Release both Tractor and Trailer Brakes. Now drive at idle speed. Apply the Service Brake to make sure you come to a complete stop, and that it doesn't pull to the left or right when applying the brakes.

Air Brake Test

The air brake test will consist of a leakdown test to make sure your air brakes aren't leaking air and losing pressure. It will also test the warning lights and buzzer to make sure the driver gets the proper warning if the air pressure drops too low.

There are three stages to an Air Brake Test

#1: Applied Pressure Test

#2: Warning Light and Buzzer

#3 Tractor/Trailer Protection Valve Pop Out

Applied Pressure Test: Build the air pressure to governor cut out. Put the truck in the lowest gear. Then turn off the engine Immediately turn the engine back on. Push in both the tractor and trailer valves. (This will release the parking brakes.) Push and hold the Brake pedal fully. Allow the gauges to stabilize. Announce the gauges have stabilized and the Primary and Secondary PSI. With the Brakes fully pressed, you should not lose more than 4 PSI in one minute. Announce that you are listening for air leaks during that minute.

Warning Light and Buzzer Test: Pump down on the Brake pedal until the warning light and buzzer comes on, at or before 60 PSI.

Tractor/Trailer Protection Valve Pop Out Test: Pump down on the brake pedal until both the tractor and trailer protection valves pop out. They should both pop out between 40 and 20 PSI.

We have a ton of Pre-Trip Inspection Practice Questions along with the answers and a complete scoring system in our Free Online CDL Practice Tests :

The Engine Compartment Section will include questions about checking the oil level and coolant levels, inspecting belt-driven engine components (like the water pump, alternator, and air compressor), and the safety devices required in the cab. There will also be questions regarding the windshield wipers and free play in the steering wheel.

The Lights And Brakes Section will include questions about dashboard indicator lights, inspecting the parking brakes, and doing a leakdown test on the air brakes. It will also include questions about the low air pressure warning signal and testing your air horn and city horn.

The Suspension And Steering Section will include questions about the tractor protection valve, inspecting the steering box, and inspecting many suspension system parts. It will also include questions about welds being present on tire rims and the minimum tread depth required on steering axle tires.

The Tires And Coupling Devices Section will include questions about shiny trails or rusty threads on lug nuts, inspecting the battery box and cover, and inspecting electrical lines. It will also contain questions about inspecting the coupling devices and the fifth wheel skid plate.

The Emergency Equipment And Fifth Wheel Section will include questions about additional emergeny equipment required by school buses, inspecting the gap between the kingpin apron and the fifth wheel skid plate, and the landing gear securement. It will also contain questions about inspecting driver mirrors and the trailer frame.

Pre-Trip Inspection Checklist - Class A

Our pre-trip inspection checklist covers every part of the truck from front to back, both inside and outside of the truck. It covers the air brakes, suspension parts, steering components, wheels and rims, fuel tanks, batteries, lights, and more. It also covers the air brake tug test and checks for everything under the hood including alternator, water pump, fuel pump, fluids, and more.

This is a super handy checklist to study anytime you have a few minutes to spare:

Pre-Trip Inspection Checklist - Free Word Document Download (Editable Version)

Pre-Trip Inspection Checklist - Free PDF Download (Print Version)

Pre-Trip Inspection Video By Apex CDL Institute

Jeff from Apex Institute does an in-depth explanation of the entire pre-trip inspection process. This video is loaded with tips that go beyond the CDL test to help drivers really understand how to identify problems.

Pretrip Inspection Self-Test By CDL College

The Pretrip Inspection Self-Test By CDL College is really unique. It's a silent video which will show you the part you're inspecting and then gives you a few seconds to figure out what you should be checking for before giving you the answer. Definitely check this one out. Great for practicing before the CDL exam.

Pre-Trip Inspection Video By Averitt Express

This is a complete back to front pre-trip inspection of a truck and trailer by Averitt mainentance associate Kevin Breeding. This thorough pre-trip inspection covers all inportant points of inside the cab, lights, engine, the tractor itself and the trailer.

We have included two print versions of the pre-trip inspection process from Daniel. The first is the entire pre-trip inspection and the second is an abbreviated checklist for the inspection.

• PDF: Daniel's Pre-trip Inspection (Print Version)
• PDF: Daniel's Pre-trip Inspection Checklist (Print Version)

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Class A Pre-Trip Inspection Study App

The CDL Pre-Trip Inspection can be the most daunting portion of the driving test. But, it's easy if you study.

Use this FREE study guide to prepare for your CDL Skills test.

Would you like a video version of the Pre-Trip Inspection? Scroll to the bottom of this page for a free video.

Courtesy of CDL College .

Metal Parts: cannot be broken or cracked and must be securely mounted. Rubber Parts: no abrasions, bulges, or cuts. Parts that hold a Fluid or Air: cannot be leaking. Example: the engine air compressor (a metal part) is securely mounted, not cracked, gear-driven, and has no audible leaks.

• The Pre-Trip Inspection is a verbal test. • Say at least 2 things about every item you inspect. • Point to, or touch, every item that you inspect. • Mention all damaged items to the tester.

01: Engine Compartment + 1 Axle

Stand in front of the truck.

(3 L’s) Lights, Leans, Leaks

Verify that the LIGHTS on the front of the truck are the proper color, securely mounted, not cracked or broken, and clean.

Next, make sure the truck isn’t LEANing to one side, which could indicate a suspension problem or low tire pressure.

Ensure there are no LEAKS underneath the engine compartment.

Check the front of truck for damage. When you find damage on the vehicle, tell the tester that you’ll note it on your Vehicle Inspection Report.

3 Components

Alternator: securely mounted, not cracked; wires are properly fastened and not frayed. Belt or gear driven: If belt-driven, belt has no more than 1/2" to 3/4" of play, and no cuts or splits.

Water Pump: (see box on right) properly mounted and not broken; no visible leaks; belt or gear driven: belt has no more than 1/2" to 3/4" inch of play and no splits or cuts.

Air Compressor: securely mounted to engine, not broken or cracked; no audible leaks; belt or gear driven: belt has no more than 1/2" to 3/4" inch of play and no splits or cuts.

Coolant: verify proper level through sight glass or dipstick; reservoir is properly mounted not cracked; check the hoses for splits or cuts and ensure they are securely mounted at both ends.

Oil: indicate where the dipstick is located and that the oil is at the proper level.

Power Steering: verify proper level through sight glass or dipstick; reservoir is securely mounted and not cracked; check the hoses for splits or cuts and ensure they are securely mounted at both ends.

Belts and Hoses

After properly inspecting the power steering hose and the coolant hose , tell the tester that you would inspect all remaining hoses the same way. After properly inspecting the alternator belt , tell the tester that you will inspect all remaining belts the same way.

Steering Shaft: not bent or broken and securely mounted; no excessive play. Steering Gear Box: properly mounted to frame and not cracked or broken; no visible leaks; HOSE has no visible leaks and is properly mounted at both ends.

Pitman Arm: not cracked and securely mounted, all hardware is present. Castle nuts and cotter pins are present and tight. Drag Link: not broken and properly mounted at both ends. Rubber bushings: not split or cut and properly greased. Upper/Lower Control Arms and Tie Rod: not broken and securely mounted, all hardware present.

Spring Mounts: spring mounts and hardware are not cracked or broken and properly mounted to frame. Leaf Springs: not cracked or broken, not shifted or scissored; properly mounted to spring hangers. U-bolts: not cracked or broken and securely mounted.

Shock Absorber: not bent or broken and mounted securely; no visible leaks; rubber bushings have no dry-rot.

Brake Hose: hose to brake chamber not split or cut, no audible leaks, and securely mounted at both ends. Brake Chamber: not cracked or broken and securely mounted; no audible leaks. Slack Adjuster: no missing hardware and properly mounted; push rod has no more than 1" of play and is at a 90° angle to brake chamber. Brake Drum: securely mounted and not broken, no bluing from excessive heat. Brake Pads: securely mounted and not broken; minimum brake pad thickness is 1/4".

Wheel inside: not broken and securely mounted; no welding repairs. Tire: sidewalls have no cuts or bulges; steer tire tread depth is 4/32" min.; tread is evenly worn; check inflation w/ air gauge (do not kick tires) ; no re-treads on steers. Wheel outside: securely mounted and not cracked, no illegal welds. Valve Stem: properly secured and not broken; no audible leaks, has a metal cap. Lug Nuts: not cracked or broken; all lug nuts are present and tight. Hub Seal: not cracked, broken, or loose; no visible leaks. End this portion of the inspection at the Hub Seal.

02: Side and Back of Truck + 1 Axle

Side and back of truck.

Mirror bracket: properly attached to truck and not broken, all hardware in place. Door: securely mounted and opens and closes; hinges not broken and securely mounted; rubber seal not split or cut and is properly mounted. Steps: hold my weight, not loose, no debris. Fuel tank: not leaking and no loose hardware; cap is tight, seal intact and chain present. Exhaust: not loose, all hardware present, no evidence of leaks (exterior soot). Cat Walk and Steps: properly mounted and not excessively dirty. Frame: not twisted or broken and no illegal welds. Drive Shaft: not cracked or broken, U-joints not broken and have no foreign objects. Rear truck lights: proper color, all lights are present, not cracked or dirty, no moisture inside the lens. Mud Flap: bracket is securely mounted and not cracked, all hardware in place; mud flap not split or cut. DOT tape is securely mounted, not dirty, covers 100% of rear. Space: enough space between rear of truck and landing gear for turns.

Note: axle suspension components can be different from truck to truck. You should determine which suspension components are present and inspect those components. Axles consist of suspension, brakes, wheels, and tires. Spring mounts: spring mounts and hardware are not cracked or broken and properly mounted to frame. Leaf Springs: not cracked or broken, not shifted or scissored; properly mounted to spring hangers. U-bolts: not cracked or broken and securely mounted. Shock Absorber: not bent or broken and mounted securely; no visible leaks; rubber bushings have no dry-rot. Air Bags: not split or cut, no audible leaks; mounts are properly secured and not cracked. Brake Hose: hose to brake chamber not split or cut, no audible leaks, securely mounted at both ends. Brake Chamber: not cracked or broken and securely mounted; no audible leaks. Slack Adjuster: no missing hardware and properly mounted; push rod has no more than 1" of play and is at a 90° angle to brake chamber. Brake Drum: securely mounted and not broken, no bluing from excessive heat. Brake Pads: securely mounted and not broken; minimum brake pad thickness is 1/4". Wheel inside: not broken and securely mounted; no welding repairs. Tires: sidewalls have no cuts or bulges; tread depth on drive tires is 2/32" min.; evenly worn; check inflation w/ air gauge (do not kick tires) ; can be re-treads; Dual Tires: no foreign objects between tires, no gap between wheels. Wheel Outside: not cracked, securely mounted, no welding repairs. Valve Stem: properly secured and not broken; no audible leaks, has a metal cap. Lug Nuts: not cracked or broken; all lug nuts are present and tight. Hub Seal: not cracked, broken, or loose; no visible leaks. End this inspection at the Hub Seal.

03: Connections

Locate the air lines and the electrical line at the rear of the cab.

Air Lines should be securely mounted at BOTH ends. All hardware is present, nothing broken. Lines have no cuts or splits and no audible leaks. Glad hands are locked in place, not broken, and seals are not split or cut.

Electrical line is securely mounted at BOTH ends. All hardware is present and tight. Lines have no cuts or splits. Safety latches are in place. Lines are not tangled or dragging on catwalk.

Fifth Wheel Assembly: Apron: securely mounted, not cracked or broken. No gap between apron and skid plate. Skid Plate: properly greased, securely mounted, not cracked. Pivot pin is securely mounted, not cracked or broken. Platform: is securely mounted to frame and not cracked or broken. Release Handle: securely mounted, not broken and in locked position. Sliding Fifth Wheel? The actuator is not cracked or broken; air line is securely mounted, no audible leaks, no cuts or splits).

Kingpin and Locking Jaws: securely mounted and not worn. Locking jaws are secure around kingpin, both are properly greased.

04: Trailer + 1 Axle

Start at the front of the trailer, then inspect the side and the back. Finish with a trailer axle. Front of Trailer: clearance lights are the proper color, not loose, cracked, or dirty, and clean. Front of trailer has no holes, all rivets present. Side of Trailer: no holes in side of trailer, all rivets in place. DOT tape: properly secured, not dirty, covers at least 50% of the side. Frame: not twisted or broken, all hardware present and tight. Cross members: securely mounted, not loose or broken, none missing. Floor: securely mounted and no holes. Landing gear: is raised, not broken, securely mounted; Handle not broken, securely mounted, and operational. Clearance light: proper color, not loose, cracked or dirty; rubber gasket not split or cut. Air lines: are securely mounted under trailer, no audible leaks, not dragging on the ground. Tandem slide: not bent, properly mounted, pins locked in place. Release arm: securely mounted, not broken, and in locked position. Mud flap: securely mounted, no cuts, and proper distance from tire and ground. ABS light: not cracked or dirty, proper color, no moisture inside

Back of Trailer: clearance lights are the proper color, not cracked or dirty, and clean. Hinges: are securely mounted, bot cracked or broken. Doors: not broken, no holes; door seal intact, no cuts, securely mounted. Door handles and rods: are not bent, are securely mounted, and operational. Lights: proper color, securely mounted, not loose, cracked or dirty. DOT tape: is securely mounted, clean, and covers 100% of rear. Bumper: is properly secured, not cracked or broken.

Trailer Axle

Note: axle suspension components can be different from truck to truck. You should determine which suspension components are present and inspect those components. Axles consist of suspension, brakes, wheels, and tires.

Trailing Arm Mount: securely mounted to frame, not broken or cracked. Spring mounts: spring mounts and hardware are not cracked or broken and properly mounted to frame. Leaf Springs: not cracked or broken, not shifted or scissored; properly mounted to spring hangers. U-bolts: not cracked or broken and securely mounted. Shock Absorber: not bent or broken and mounted securely; no visible leaks; rubber bushings have no dry-rot. Air Bags: not split or cut, no audible leaks; mounts are properly securedand not cracked. Brake Hose: hose to brake chamber not split or cut, no audible leaks, securely mounted at both ends. Brake Chamber: not cracked or broken and securely mounted; no audible leaks. Slack Adjuster: no missing hardware and properly mounted; push rod has no more than 1" of play and is at a 90° angle to brake chamber. Brake Drum: securely mounted and not broken, no bluing from excessive heat. Brake Pads: securely mounted and not broken; minimum brake pad thickness is 1/4". Wheel inside: not broken and securely mounted; no welding repairs. Tires: sidewalls have no cuts or bulges; tread depth on drive tires is 2/32" min.; evenly worn; check inflation w/ air gauge (do not kick tires) ; can be re-treads; Dual Tires: no foreign objects between tires, no gap between wheels. Wheel Outside: not cracked, securely mounted, no welding repairs. Valve Stem: properly secured and not broken; no audible leaks, has a metal cap. Lug Nuts: not cracked or broken; all lug nuts are present and tight. Hub Seal: not cracked, broken, or loose; no visible leaks. End this inspection at the Hub Seal.

05: External Light Check

Follow the flow to avoid missing any lights: 4 sides for the truck, 4 sides for the trailer.

Group similar lights together (headlights and high beams; turn signals and 4-way flashers; brake lights and tail lights).

TRUCK LIGHTS

Front: clearance lights, headlights, high beams, left turn, right turn, 4-way flashers

Left side: clearance light, left turn, 4-way flasher

Rear: tail lights, brake lights, left turn, right turn, 4-way flashers

Right side: clearance light, right turn,4-way flasher

TRAILER LIGHTS

Front: clearance lights

Rear: clearance lights, tail lights, brake lights, left turn, right turn, 4-way flashers

Right side: clearance light, right turn, 4-way flasher

06: In Cab and Brake Test

Memorize this formula: 5, 5, Safe Start, 5, 5 5 safety items 5 in cab items Safe Start 5 gauges 5 -step brake check

5 Safety Items

5 in cab items.

Follow the blue spiral shape below to remember the 5 in cab items. Mirrors: glass not dirty or cracked, no illegal stickers, mirrors properly adjusted. Windshield: securely mounted, not dirty or cracked, no illegal stickers. Windshield wipers: arms properly mounted and not broken; blades have no splits or cuts, wipers and wiper fluid are operational. Heater/defroster: demonstrate both are operational by setting fan to max, and the mix valve to heat/defrost. Dashboard light indicators: turn the lights on and check the indicators for the high beams, right and left turn signals, and 4-way flashers.

Tell the examiner these 3 steps before you perform them: parking brake is set, transmission in neutral, and the clutch is depressed. Start the engine and look for the ABS light on the dash to come on and then go off. With the vehicle started, check the gauges.

Oil gauge: operational, rising to proper operating range, no warning light. Temperature gauge: operational, rising to proper operating range, no warning light. Voltmeter: operational, at the proper operating range, 12-14 volts. Air gauges (2): building air to proper operating range, no warning lights.

5-step Brake Test

Explain each step before performing it. With the first 2 steps, you’re either trying to move the vehicle, or you are moving the vehicle. The engine must be ON for the first 2 steps. 1) Parking Brake: release trailer brake (push RED valve IN); slowly release the clutch, tugging lightly against the parking brake. Push clutch in. (Leave everything in the truck as it is). 2) Service Brake: (brake pedal) release parking brake (BOTH valves should be IN), pull forward to 5 mph, depress clutch and brake while lightly gripping the steering wheel; check if vehicle pulls to the left or right. (Leave everything in the truck as it is).

**Turn the engine OFF, and turn the key ON for the next 2 steps. You’ll need power for your gauges.**

Air Compressor check: perform a Safe Start. Idle up the engine (1200RPM) until the secondary air tank reads 85psi. At 85psi begin counting. The air pressure must rise from 85 to 100psi in 45 seconds or less. Next, fast idle the truck up to 120-140psi, at which point the governor cut-out should occur. Psshhh!

Class A CDL Pre-Trip Inspection Video

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