It's all DOT
Things that go Clunk
I See You
STOP!!!!
It's all in the Volt
100

This component must disengage of "Pop" out after primary pressure falls below 35 psi. 

What is the Tractor Protection Valve

100

This brake component is allowed to have a maximum of 0.030" and is only found on an Drum Brake system

What is The S-Cam/ S-Cam Bushings

100

This number is to be located on the tractor body which represents the owning company's registration with the Department of Transportation and is used to identify that tractor as a commercial vehicle

What is a DOT number

100

This method of testing is used to describe the total measurement of rod travel in a brake chamber that has air pressure in both the Service port and Emergency Port

What is a Full Brake System Application or Applied Brake Stroke

100

This electrical component is tested during the Pm for operation. It is deemed failed should the batteries remain at 12 volts or lower while the engine is in operation

What is an Alterntor

200

This tire isn't allowed to exceed 4/32nds of tread life

What are the Steer Tires

200

This component has a minimum and maximum end play tolerance of 0.001-0.005 thousands of an inch and can be deemed a possible failure if the tires are wearing irregularly

What are The Wheel Bearings

200

This sticker is to be placed on the driver side of the tractor with holes punched out signifying the last month and year the most recent DOT inspection was completed.

What is the FMCSA Annual inspection sticker

200

This is the lowest amount of brake shoe life that is acceptable by DOT standards

What is 8/32nds or 1/4in

200

This AC component when fails will present as the compressor operating like normal, however there will be no air flow coming from the vehicle's Vents.

What is a Blower Motor

300

This type of fluid leak is determined to be a DOT violation

What is ANY type of fluid leak

300

This vehicle coupling device has an adjustment bolt located to the passenger side, and while in locked position is allowed to have a 1/4 of end play

What is the Fontaine No Slack Fifth Wheel

300

This type of sticker is to be placed around the rear of the cab in the shape of the letter L upside down and reversed on the top of the roof or fairing to signify height while driving in dark conditions.

What is Conspicuity Markings

300

This component if left in the brake chamber while the vehicle is in use is a massive DOT violation

What is a caging bolt

300

This electrical component is used on ALL trailer lighting circuits and uses a smaller current to trigger a bridge to a circuit requiring a higher amp load

What is a Relay

400

This component can have additional aftermarket additions installed on the tractor, provided during DOT inspection, they all must work

What is A light

400

This drive line component is expected during the PM and if ANY play is found, the component is to be replaced. Sometimes referred to as the Weakest link in the drivetrain system

What is a U-joint

400

This component each driver must have present during a DOT inspection, as a technician we may have to install this "aftermarket" component and verify it's properly operating for the driver to record their hours of service

What is an ELD/GPS tracking device

400

This component prevents full system air pressure loss in the event one system develops catastrophic air pressure loss by allowing air to flow in only one direction and not the other

What is a Check Valve

400

This communication system device prevents backflow of communication data in the CAN system known as "Echoes"

What is a Terminating Resistor

500

This component exhaust aftertreatment device is responsible for eliminating "Particulate Matter" from being released to the atmosphere, and must be present at the time of inspection if the vehicle was built after 2007

What is The Diesel Particulate Filter

500

This component is part of the steering system and can allow some rotational movement, but NOT up and down movement

What is a ball joint

500

This measurement is used to determine the acceptable amount of tread loss in the event a section of the tire tread is missing and/or damaged

What is 1in x 1in

500

This component is responsible for allowing air pressure used in the brake system to quickly exhaust to the atmosphere to allow the vehicle to move again freely following a brake application

What is a Quick Release Valve

500

This electrical component is responsible for handling switch inputs within Tractor Cab Systems such as mirrors, windows, and lighting. 

What is the Body Control Module