It's all DOT
This component must disengage or "Pop" out after primary pressure falls below 35 psi.
What is the Tractor Protection Valve
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
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
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
This is the acceptable Urea Concentration Range to be found while testing DEF fluid
What is 31-34%
This tire isn't allowed to exceed 4/32nds of tread life
What are the Steer Tires
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
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
This is the lowest amount of brake shoe life that is acceptable by DOT standards
What is 8/32nds or 1/4in
This component is responsible for converting Nitrogen Oxide into Oxygen and Nitrogen with the use of DEF
What is the Selective Catalytic Reduction System
This type of fluid leak is determined to be a DOT violation
What is ANY type of fluid leak
This vehicle coupling device has an adjustment bolt located to the passenger side, and while in locked position, the adjustment bolt is allowed to have 1/4in of movement
What is the Fontaine No Slack Fifth Wheel
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
This component if left in the brake chamber while the vehicle is in use is a massive DOT violation
What is a caging bolt
This component is responsible for providing the fuel source to the exhaust aftertreatment system, and when failed or clogged, will prevent the exhaust system from reaching necessary temperatures to achieve successful Regeneration
What is the Hydrocarbon Doser
This component can have additional aftermarket additions installed on the tractor, provided during DOT inspection, they all must work
What is A light
This drive line component is inspected 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
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
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
This DEF tank component is responsible for reporting, temperature, pressure, quality, and fluid level
What is the DEF Tank Header
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
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
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
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
This ECM subsystem is designed to be a penalty if a fault code regarding the exhaust system is ignored and results in the tractor not exceeding 5mph and runs for only 120 seconds prior to shutting down.
What is a Stage 4 De-rate