Comprehensive Testing Procedures
Follow these detailed testing procedures during your biannual truck inspection to ensure thorough evaluation of critical systems.
Brake Performance Testing
- Conduct brake balance test across all axles
- Perform loaded stopping distance test in controlled environment
- Measure pushrod travel at all brake chambers
- Test parking brake holding ability on 20% grade or equivalent
- Verify ABS function with diagnostic equipment
- Conduct brake timing test for proper sequential operation
Engine Diagnostic Analysis
- Connect diagnostic computer and run full system scan
- Perform compression test on all cylinders
- Conduct cylinder balance test during operation
- Analyze exhaust opacity and emissions levels
- Test fuel pressure at multiple operating RPMs
- Verify turbocharger boost pressure and operation
Electrical System Testing
- Conduct voltage drop test across all major circuits
- Perform load test on batteries with carbon pile tester
- Measure alternator output at idle and operating RPM
- Check starter current draw during operation
- Test all lighting circuits for proper amperage draw
- Verify proper grounds at all major connection points
Fluid Analysis Protocol
- Collect engine oil sample for laboratory analysis
- Sample transmission fluid for contamination testing
- Test coolant for proper glycol content and protection level
- Analyze differential fluid for metal content
- Check power steering fluid for contamination
- Test DEF fluid for correct concentration and purity
Maintenance Recommendations
The following maintenance tasks should typically be performed during biannual inspections, regardless of mileage or hour intervals. These services complement the inspection process and enhance vehicle reliability.
Recommended Fluid Services
- Complete engine oil and filter change
- Transmission fluid and filter replacement
- Differential fluid replacement
- Cooling system flush and refill
- Power steering fluid replacement
- Air system dryer desiccant replacement
- Fuel system water separator service
Recommended Component Replacements
- Air filter replacement regardless of condition
- Fuel filters replacement
- Belts replacement if over 2 years old
- Wiper blade replacement
- Critical hoses replacement if over 4 years old
- Battery replacement if over 3 years old
- DPF cleaning or regeneration
Recommended Lubrication
- Chassis complete lubrication service
- Steering components lubrication
- Driveline U-joints and slip joints greasing
- Fifth wheel plate and locking mechanism lubrication
- Door hinges and latches lubrication
- Brake S-cam lubrication
- Slack adjuster lubrication
Recommended Adjustments
- Valve adjustment (if specified by manufacturer)
- Clutch free travel adjustment (if manual)
- Brake adjustment on manual systems
- Wheel bearing adjustment
- Belt tensioner adjustment
- Headlight aim verification and adjustment
- Tire rotation if uneven wear patterns