Peterbilt 567/579 Mud Flaps

Frequently Asked Questions About Peterbilt 567/579 Mud Flaps

Will these mud flaps fit my specific Peterbilt 567 or 579 model year?

Most aftermarket mud flaps for Peterbilt 567/579 models are designed to fit trucks from 2013 to current model years. However, there can be variations based on your truck's configuration, such as extended hood models or specific suspension setups. We recommend checking the product specifications for each mud flap set, as some are universal while others are designed for specific configurations like set-forward or set-back axles. If you're unsure, contact us with your OEM or truck specifications for verification.

What's the difference between rubber and stainless steel backed mud flaps?

Rubber mud flaps are the most economical option, typically lasting 1-2 years under normal conditions. They're lightweight and absorb impact well but can tear or crack in extreme weather. Stainless steel backed mud flaps feature a metal plate bonded to heavy-duty rubber, offering 3-5 years of service life. They resist bending and maintain their shape better, especially important for drivers in harsh winter conditions or rough terrain. The stainless backing also allows for custom designs and logos while providing superior protection against road debris.

Do I need special brackets or hardware to install these mud flaps?

Installation requirements vary by your truck's existing setup. If you're replacing OEM mud flaps, you can often reuse existing brackets and mounting holes. For new installations or upgrades, you'll typically need mud flap hangers, which we sell separately or in complete kits. Standard installations require 4-6 mounting bolts per flap, and the process takes about 30-45 minutes per side. Some heavy-duty or anti-sail options may require additional support brackets to prevent flapping at highway speeds.

What size mud flaps do I need for my Peterbilt 567/579?

Standard mud flap sizes for Peterbilt 567/579 trucks are 24" x 30" for the rear and 24" x 24" for the front, though this can vary based on your specific application and state regulations. Dump trucks and heavy haulers often require 24" x 36" rear flaps for additional coverage. Measure from your mounting point to ensure proper ground clearance - typically 6-8 inches from the pavement when loaded. Some states have specific requirements for mud flap coverage, so verify local DOT regulations before purchasing.

How do I prevent mud flaps from sailing or flapping while driving?

Mud flap sailing is a common concern that can cause premature wear and damage. Anti-sail brackets or weights are the most effective solution, keeping flaps stable at highway speeds. For rubber flaps, consider models with built-in weights along the bottom edge. Stainless steel backed options naturally resist sailing due to their weight and rigidity. Proper installation angle is crucial - flaps should hang straight down, not tilted forward or backward. Regular inspection of mounting hardware and tightening loose bolts also helps maintain proper positioning and reduces sailing issues.