Frequently Asked Questions About Peterbilt 330/335/337 Drum Brake Parts
Will these drum brake parts fit my specific Peterbilt 330, 335, or 337 model year?
Our drum brake parts are designed to fit Peterbilt 330, 335, and 337 models from 2005 through current production years. However, brake specifications can vary based on your truck's GVWR, axle configuration, and whether you have hydraulic or air brakes. We recommend checking your OEM or existing brake part numbers before ordering. If you're unsure, our customer service team can help verify compatibility with your specific truck configuration.
What's the difference between OEM and aftermarket drum brake components, and which should I choose?
OEM parts meet Peterbilt's exact specifications and typically carry warranties, while quality aftermarket options often provide comparable performance at lower prices. For critical components like brake drums and shoes, we recommend OEM or premium aftermarket brands that meet or exceed FMVSS 121 standards. Budget aftermarket parts work well for hardware kits, springs, and adjustment components. Consider your truck's usage - commercial operations may benefit from OEM reliability, while lighter-duty applications can save with aftermarket alternatives.
Can I convert my Peterbilt 330/335/337 from drum brakes to disc brakes?
While disc brake conversion kits exist for some Peterbilt medium-duty trucks, the process involves significant modification including new hubs, rotors, calipers, and potentially different wheels. Most 330/335/337 models came factory-equipped with drum brakes that provide adequate stopping power for their intended applications. Conversion costs often exceed $3,000 per axle. Unless you have specific performance needs, maintaining and upgrading your existing drum brake system is usually more cost-effective.
How often should I replace drum brake components, and what are the warning signs?
Brake drums typically last 150,000-200,000 miles with proper maintenance, while shoes may need replacement every 50,000-75,000 miles depending on your driving conditions and load weights. Warning signs include squealing or grinding noises, increased stopping distances, brake pedal pulsation, or visible scoring on drum surfaces. During inspections, measure drum diameter - most Peterbilt 330/335/337 drums have a discard diameter stamped on them, typically around 16.620" for 16.5" x 7" brakes. Replace drums approaching this limit.
What tools and expertise do I need to install drum brake parts myself?
Drum brake service requires specialized tools including a brake spring tool, drum puller, brake adjustment gauge, and proper jack stands rated for medium-duty trucks. You'll need mechanical experience with air brake systems if equipped, plus knowledge of proper adjustment procedures. Common DIY mistakes include improper shoe-to-drum clearance, incorrect spring installation, and inadequate lubrication of cam bushings. While experienced mechanics can complete the job in 2-3 hours per axle, first-timers should budget a full day. Consider professional installation if you lack the proper tools or experience with commercial brake systems.
