Frequently Asked Questions About Freightliner FLC120 Front Axle Air Ride Kits

Will these air ride kits fit my specific year FLC120, and what about Classic models?

Most front axle air ride kits are designed to fit Freightliner FLC120 models from 1990-2003. However, fitment can vary based on your specific axle configuration (12,000 lb vs 14,000 lb front axles) and whether you have a set-forward or set-back axle. Classic models often share the same mounting points, but you'll need to verify your axle model number before ordering. Check the casting numbers on your front axle beam or contact us with your VIN for exact fitment confirmation.

How difficult is the installation, and what tools do I need?

Installation typically takes 4-6 hours for someone with moderate mechanical experience. You'll need basic hand tools, a floor jack, jack stands rated for commercial trucks, and ideally an air compressor for testing. The most challenging part is usually removing the existing leaf springs and U-bolts, which may require penetrating oil and heat if they're corroded. Most kits come with detailed instructions, but many customers recommend having a helper due to the weight of components. Professional installation typically runs $400-800 depending on your location.

What's the actual ride improvement, and will it affect my truck's handling?

Customers typically report a 60-70% improvement in ride quality, especially noticeable on rough roads and expansion joints. The air ride eliminates the harsh jolting common with leaf springs, reducing driver fatigue on long hauls. When properly adjusted, handling remains stable with improved cornering due to reduced body roll. Load capacity remains the same as your original suspension rating. Some drivers note a slight increase in overall ride height (1-2 inches) which may require headlight adjustment.

What maintenance is required, and how long do these systems last?

Air ride systems require minimal maintenance beyond regular visual inspections for air leaks and checking air pressure monthly. Air bags typically last 100,000-150,000 miles under normal conditions, though harsh environments may reduce lifespan. Keep the air bags clean and free from road chemicals. Most failures occur from rubbing or punctures rather than normal wear. Replacement air bags cost $150-300 each and can be changed in about an hour. The compressor and valves are usually trouble-free for the life of the truck with proper air system maintenance.

Do I need to upgrade my air system, and what PSI should I run?

Most FLC120s have adequate air capacity for front air ride addition without modifications. The system typically requires 5-7 CFM during height adjustments, which standard truck compressors handle easily. Operating pressure usually ranges from 60-90 PSI depending on load, with most drivers running 70-75 PSI for optimal ride quality. Kits include pressure gauges and some offer in-cab controls for on-the-fly adjustments. If adding rear air ride simultaneously, you may want to verify your compressor output, though upgrades are rarely necessary.