3D truck lab
Turn the truck, tap a part to learn what it does, and watch how air pressure controls the brakes.
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Steering axle tires
Front tires need at least 4/32 inch of tread. Recapped or regrooved tires are not allowed on the steering axle of a truck or bus.
Parts
Air pressure simulator
⚠ LOW AIR
Numbers from the national CDL manual text; check your state manual.