Tech Articles

Cold weather can be tough on your vehicle's air brake system, and it's crucial to take proactive measures to ensure it functions correctly during chilly winter months. In this blog post, we'll explore common symptoms of air brake issues in cold weather and the corrective actions you can take to prevent problems and maintain a reliable air brake system.

Symptom: Air System Freeze-ups

Possible Causes:

1. Excessive Leakage

Corrective Action:

• Check compressor unloader, governor, and air dryer check valve.
• Ensure proper supply, delivery, and control hose connections.
• Clear air lines with shop air to ensure unobstructed winter operation.
• Check for kinked, broken, plugged, or frozen unloader lines.

Symptom: Purge Valve Freezes, Open or Closed

Possible Causes:

1. Air Dryer Cover Will Not Warm Up

Corrective Action:

• Test Heater: The heater cannot be tested at room temperature. The thermostat in the end cover controls the heater. The cover must be cooled to below 40 degrees Fahrenheit and will cut out above 85 degrees Fahrenheit.
• Check the fuse.
• Test the thermostat with an ohmmeter (refer to appropriate service data manual sheets).
• Check for power to the end cover and ensure a good ground connection.
• Insulate the end cover to help contain heat.

Preventive Measures for Cold Weather Air Brake Maintenance

Now that we've identified common cold weather air brake issues and their corrective actions, let's delve into preventive maintenance steps to keep your air brake system in top-notch condition during winter:

1. Regular Inspections:

• Conduct routine inspections of your air brake system to identify potential issues early.
• Check for visible signs of damage or wear on air lines, connectors, and valves.

2. Keep Connections Secure:

• Ensure all supply, delivery, and control hose connections are properly secured.
• Tighten any loose fittings or connections to prevent air leaks.

3. Unloader Line Maintenance:

• Regularly inspect the unloader line for kinks, breaks, or obstructions.
• Replace or repair damaged unloader lines promptly.

4. Governor and Air Dryer Checks:

• Monitor the governor, compressor unloader, and air dryer check valve for proper operation.
• Address any issues immediately to maintain efficient air drying and distribution.

5. Air Dryer Service:

• Don't overlook the importance of servicing your air dryer.
• Replace the desiccant cartridge regularly, as recommended by the manufacturer.
• Inspect the purge valve for any signs of wear or malfunction.

6. Heater Testing:

• Test the heater in the air dryer cover as part of your cold weather maintenance routine.
• Ensure it functions within the specified temperature range.
• Check the fuse, thermostat, and electrical connections for any faults.

7. Insulation:

• To help retain heat in critical components like the air dryer cover, consider insulating these areas.
• Proper insulation can prevent freeze-ups and maintain optimal performance.

8. Reference Service Data Manuals:

• Consult your vehicle's service data manuals for specific guidance on testing, maintenance, and resistance values.
• Follow manufacturer-recommended procedures for troubleshooting and maintenance.

In conclusion, proactive cold weather air brake maintenance is essential to keep your vehicle's air brake system operating smoothly during winter. Regular inspections, proper connections, and timely repairs are key to preventing freeze-ups and ensuring the reliability and safety of your braking system in chilly conditions. By following these preventive measures, you can minimize the risk of air brake issues and maintain the efficiency of your fleet during the coldest months of the year.