FREIGHTLINER AIRSPRING / AIRBAG, SHOCKS

Product Overview

  • Application: Freightliner trucks — front and rear suspension compatibility depends on model and year. Confirm OEM part numbers before ordering or installation.

  • Components: Heavy-duty airspring/airbag assembly and matched shock absorbers designed to restore ride height, stability, and load-handling performance.

  • Construction: Reinforced rubber bellows with steel-composite top and bottom plates; corrosion-resistant coatings on metal parts to withstand road salts and harsh environments.

  • Performance: Improves ride comfort, reduces chassis stress, maintains consistent axle position under load, and enhances braking stability and tire wear.

Symptoms Indicating Replacement

  • Sagging or uneven ride height

  • Excessive bouncing or bottoming out over bumps

  • Noticeable lean during turns or under load

  • Air system warnings, compressor cycling more frequently, or audible air leaks

  • Visible cracks, dry rot, or separation on airbag bellows

  • Fluid leakage or pitting on shock bodies; diminished damping causing nose dive or rear squat

  • Tire cupping or accelerated, uneven tire wear

Inspection Checklist

  • Visual: Check airbag bellows for cracks, abrasions, or bulging. Inspect top and bottom mounts for corrosion, cracks, or loose hardware.

  • Leak test: Apply soapy water to air fittings and bellows while system pressurized to locate leaks. Listen for hissing at connections and airline routing.

  • Ride height: Measure static ride height and compare to manufacturer specs. Check ride height sensors and push-rods for proper orientation.

  • Shock assessment: Inspect shock rods for pitting, bent shafts, or oil seepage. Check mounting bushings and hardware for wear or elongation.

  • Alignment and suspension: Check U-bolts, axle seats, spring hangers, and frame for deformation. Verify brake lines and ABS sensor routing clearances.

Maintenance and Service Recommendations

  • Regularly inspect airbellows and shocks during scheduled PM checks (every 10,000–25,000 miles depending on operation).

  • Monitor compressor cycle frequency and system pressure retention; excessive cycling can indicate leaks or failing components.

  • Replace shocks in axle pairs (both sides) to maintain balanced damping.

  • Use manufacturer-specified replacement parts or approved aftermarket equivalents rated for heavy-duty vocational use.

  • Keep mounting hardware and pivot points lubricated where applicable and free of corrosion.

Common OEM Part Types (examples — verify fitment)

  • Freightliner front/rear airspring assemblies (varies by model: Cascadia, M2, Coronado, etc.)

  • Heavy-duty monotube or twin-tube shocks for medium/heavy truck axles

  • Air fittings, airlines, and check valves

Contact JB Fleet Management for diagnostic, replacement, and preventive maintenance services, including mobile installation, safety checks, and post-service inspections.