Peterbilt’s Model 579 is new from the ground up

Innovative aerodynamic styling, robust design complement productivity-driven driver environment

Maximum visibility is achieved through a panoramic-style windshield that is also thicker than previous designs for improved noise insulation and chip resistance.

The windshield also improves aerodynamics through integrated encapsulation during the assembly process for superior fit and finish and a durable seal.

If it needs to be replaced, integrated locators in the cab structure facilitate high-quality, time-efficient repairs in the field or the shop.

The cab’s A-pillar design is 20-percent narrower than competitive designs, further improving visibility without sacrificing strength, noted Sproull.



Doors are newly designed with a durable, aluminum double-wall structure that reduces weight. Built to withstand harsh conditions, the new hidden gravity-hinge system requires little effort to close doors and provides an airtight seal upon closing to reduce wind noise.

Rounding out the entry package is a new amber, lower-door LED signature light.



The state-of-the-art forward lighting system produces superior down-road visibility while reducing operator fatigue.

Standard halogen headlamps emit even beam patterns and the fog lamps eliminate hotspots. Separate daytime running lamps maximize headlamp life and improve safety.

The new door-mounted mirrors improve both aerodynamics and visibility.

Among the features of the mirrors are cast aluminum arms and bases, large reflective surfaces, integrated convex mirrors, standard heating elements, optional motorized elements and an airflow-managing shape that virtually eliminates debris build-up, misting and wind noise.

New serviceability improvements include no-tool-necessary glass replacement with one electrical connector.

Electrical system

When redesigning the Model 579’s electrical system, Sproull said the goal was to create a robust architecture that optimized routings.

“Electrical system integrity was a key focus during the development of the 579. The result is an all-new system that includes innovative protection and routing design elements.”

Additional electrical system enhancements include angled dress covers that reduce pin tension and provide additional protection to connections and routing troughs.

Sproull said the cab electrical and air connections, air intake filter, A/C service ports and fresh-air filter are mounted to the firewall for easy access.

“But perhaps the most innovative improvement to the electrical system are the new electric-over-air rocker switches that enable critical interlocks. Not only does this technology remove air plumbing from the dash, it ensures the correct operation settings of critical systems.”

Chassis design

The backbone of the Model 579 is a new chassis design that is lightweight, stiff and incorporates exceptional maneuverability.

“The turning radius and the ride and handling characteristics provide superior operability and performance,” said Sproull. “Through angled gear installation, wheel cut is optimized for exceptional curb-to-curb turning.

Even though the chassis weight is reduced, its stiffness was increased by 10 to 15 percent to improve ride-and-handling performance and reduce in-cab noise.

New chassis systems routings for the air and fuel lines enhance ease of serviceability and reduce repair times, as do separation of key air, fuel and diesel emissions fluid lines and electrical wiring.

The 579 comes standard with front air-disc brakes and the Bendix Electronic Stability Control system.

“The Model 579 has a secure place in the legendary lineup of Peterbilt vehicles,” said Kozek.

“It is a true cross-platform vehicle that will appeal to both the passion and sensibilities of a wide range of customers across numerous applications and market segments.”


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