Detailed Service Procedures
Follow these structured procedures for critical maintenance tasks at the 24,000-mile service interval. These detailed steps help ensure consistent quality and thoroughness for essential service operations.
Brake Inspection & Adjustment Procedure
- Secure vehicle and release spring brakes
- Remove dust shields (if equipped) for proper inspection
- Measure brake lining thickness at thinnest point
- Inspect drums/rotors for cracks, heat checking, or grooves
- Check for proper drum-to-lining clearance
- Verify proper slack adjuster stroke (3/4" to 1" at 90 psi)
- Adjust brakes if necessary according to manufacturer specs
- Reinstall dust shields and components
- Perform brake application test and verify equal braking
Fifth Wheel Service
- Inspect for cracks in fifth wheel plate and mounting brackets
- Clean fifth wheel plate of all old grease and debris
- Check jaw/lock operation for complete engagement
- Verify proper release handle operation and adjustment
- Inspect mounting bolts for proper torque
- Measure and verify kingpin locking range
- Apply proper fifth wheel grease to plate surface
- Check slider rail operation and locking pins (if equipped)
Air System Maintenance
- Drain all air tanks completely
- Inspect air dryer and replace desiccant cartridge if needed
- Check air compressor discharge line for carbon buildup
- Test air pressure build-up time (85-100 PSI in under 3 minutes)
- Verify low pressure warning system activates at 60 PSI
- Check for air leaks throughout system
- Test spring brake automatic application
- Inspect gladhand seals and replace if damaged
Kingpin and Upper Coupler Inspection
- Clean kingpin and upper coupler plate thoroughly
- Measure kingpin diameter with proper gauge
- Inspect kingpin for cracks, gouges, or deformation
- Check upper coupler plate for cracks or warping
- Verify proper upper coupler mounting to trailer frame
- Inspect reinforcement webbing for damage
- Test kingpin with fifth wheel locking test
- Document wear measurements for future reference
Top 5 FAQs
- What is included in 24,000-mile service? Engine, brakes, suspension, electrical, trailer inspections, and coupler checks.
- Is it DOT-compliant? Yes, aligned with FMCSA Schedule C requirements.
- When is Schedule C due? Every 24,000 miles or 12 months.
- Can it apply to all trailers? Yes, flatbed, reefer, dry van, tanker, and more.
- Can I use this checklist online? Yes, visit FleetRabbit.com for interactive use.