Frequently Asked Questions About Freightliner FL70-FL80 Drum Brake Parts

What years and models are these drum brake parts compatible with?

Our drum brake parts are designed specifically for Freightliner FL70 and FL80 models manufactured between 1991 and 2007. These parts fit both single and tandem axle configurations. However, there are variations between pre-2000 and post-2000 models, particularly in brake shoe widths and drum sizes. We recommend checking your VIN or existing part numbers to ensure proper fitment, as some FL70 models came with either 15-inch or 16.5-inch brake assemblies depending on the GVWR rating.

Are aftermarket brake drums and shoes as reliable as OEM parts?

The aftermarket brake components we carry meet or exceed OEM specifications and are manufactured to SAE J2681 standards. Our drums are cast from high-grade iron alloy with proper heat treatment to prevent warping and ensure consistent braking performance. The brake shoes feature premium friction material that provides equivalent stopping power and lifespan to original equipment. Many fleet operators actually prefer certain aftermarket brands due to their improved heat dissipation design and competitive pricing without sacrificing safety or durability.

What tools and experience level are needed to replace drum brakes on an FL70/FL80?

Replacing drum brakes requires intermediate mechanical skills and specific tools including a brake spring tool set, drum puller, torque wrench capable of 450-500 ft-lbs for wheel bearings, and proper jack stands rated for commercial vehicles. The job typically takes 3-4 hours per axle for experienced technicians. Critical steps include proper brake adjustment (maintaining 0.030-inch shoe-to-drum clearance), correct spring orientation, and hub bearing preload adjustment. Due to safety implications and DOT requirements, we recommend professional installation if you lack commercial vehicle brake experience.

How do I identify which brake drum size I need - 15-inch or 16.5-inch?

The easiest method is to check the stamped markings on your existing brake drum, typically found on the outer edge or mounting surface. Alternatively, measure the inside diameter of the drum or check your door jamb sticker for brake specifications. FL70 models with GVWR under 26,000 lbs typically use 15x4 inch drums, while heavier-rated FL70s and most FL80s use 16.5x7 inch drums. The brake chamber size also indicates drum size - Type 20 chambers usually pair with 15-inch drums, while Type 24 or 30 chambers indicate 16.5-inch drums.

What causes premature wear on FL70/FL80 drum brakes and how can I prevent it?

Common causes include improper slack adjuster settings, contaminated friction material from leaking wheel seals or axle vents, and overheating from excessive brake use or dragging brakes. Mismatched friction materials between axles can cause uneven wear and reduced braking efficiency. Prevent premature wear by maintaining proper adjustment (check every 3,000 miles), inspecting for oil contamination during pre-trip inspections, ensuring brake balance across all wheels, and using proper downhill braking techniques. Regular cleaning of brake dust and checking for proper drum ventilation also extends component life significantly.