Air Suspension Maintenance Schedule

If you take care of a truck's air suspension system, it will take care of you. But maintaining a vehicle’s suspension system requires more than just checking its shock absorbers. To help you protect your ride and load, we’ve put together a chart that details recommended inspection and maintenance schedules for major suspension system components.

  Daily / At Installation 15,000 Miles 50,000 Miles 100,000 to 150,000 Miles ANNUALLY
Shock Absorbers   Visually inspect and replace if broken or leaking. Tighten loose mounting hardware Perform a heat test within a few minutes of operating the vehicle to check for internal failure. Internal failure cannot be detected visually. Replace at 100,000 miles (vocational) or 150,000 miles (on highway), or according to manufacturer’s guidelines. Have shocks professionally inspected to ensure premium performance.  
Fasteners and U-bolts Retorque once after first 1,000 to 3,000 loaded miles. Inspect for signs of wear deformity; replace if found. Check fastener and u-bolt torque, and adjust as necessary   Have fasteners professionally inspected for loose, damaged or cracked components.  
Bushings – Rubber Retorque once after first 1,000 to 3,000 loaded miles.       Inspect for signs of wear deformity or fatigue in transverse rod; replace if found.
Bushings – Metal Retorque once after first 1,000 to 3,000 loaded miles. Lubricate non-sealed bushings every 10,000 to 20,000 miles.     Inspect for signs of wear deformity or fatigue in transverse rod; replace if found.
Air System Suspension Drain air tank using the moisture ejector valve.   Visually inspect air springs for cracks, gouges, bulges, chafing and similar signs of wear. or 60 months or 60 months
Taper Leaf Suspension Inspect and note any sagging or slumping. Check and retorque u-bolts after 3,000 miles, and every three months afterward. Inspect leaf springs and u-bolts for signs of damage and wear. Retorque u-bolts   Check the following, inspect for wear and replace if damage is found: • Torque settings • Suspension bushings • Leaf springs • U-bolts • Axle alignment

Sources: American Transportation Associations Trucking Technology & Maintenance Council; Public Works magazine; Heavy Duty Truck Systems, Sixth Edition