Freightliner FLC120 Deck Plates & Air Line Boxes

Frequently Asked Questions About Freightliner FLC120 Deck Plates & Air Line Boxes

What is the purpose of a deck plate and air line box on my FLC120?

The deck plate is the flat panel mounted behind the cab that provides a work surface and mounting point for the air and electrical lines running between the tractor and trailer. The air line box houses and protects the glad hand connections, air lines, and electrical connectors, keeping them organized and shielded from road debris while coupling and uncoupling trailers.

Will this deck plate or air line box fit my specific FLC120 without modification?

Deck plates and air line boxes can vary depending on the model year, cab configuration, and how the original equipment was mounted on your truck. Before ordering, compare the bolt pattern, overall dimensions, and mounting height of the listed part against what is currently on your truck. If you are unsure, having your VIN or the part number off your original component on hand will help confirm a proper fit.

What material are these deck plates and air line boxes made from, and will they hold up over time?

Most deck plates and air line boxes in this category are constructed from steel or aluminum. Steel components typically come primed or painted and offer strength for high-wear applications, while aluminum options resist corrosion and reduce weight. Check the individual product listing for the specific material and finish, since options vary by part.

What tools and steps are involved in installing a replacement deck plate or air line box?

Installation generally involves removing the fasteners securing the old component, disconnecting air lines and electrical connectors, and transferring or reinstalling the hardware onto the new part. Basic hand tools such as wrenches and sockets are usually sufficient. Always support the component during removal, and inspect air lines and fittings for wear before reassembly to avoid leaks or connection issues.

Do I need to worry about air line routing or DOT compliance when replacing this part?

Yes. Air lines and electrical connections must be routed and secured so they cannot rub, kink, or become pinched, since this can lead to air leaks or lighting failures that affect braking performance and compliance with DOT inspection standards. When installing a replacement deck plate or air line box, make sure all lines are properly clamped, connectors are seated fully, and nothing interferes with trailer hookup or ground clearance.