Replacing Air Bags on Reefer Trailers - Prevent Cargo Damage

Understanding Reefer Trailer Air Bag Suspension Systems

Reefer trailers transport perishable goods like produce, meat, dairy and frozen items across long distances. To ensure a smooth ride and prevent cargo damage, most reefer trailers use an air bag suspension system. Air bags, also called air springs, provide a cushion between the trailer frame and axle. Let's take a closer look at how these systems work.

Components of Air Suspension Systems

A basic air bag suspension uses rubberized air bags mounted over each axle instead of metal springs. The system relies on air pressure to provide shock absorption and adjust ride height. Key components include:

• Air bags - Rubberized bags filled with compressed air to absorb shocks from the road.
• Air lines - Transfer air between bags, control valves and air supply.
• Control valves - Regulate airflow to raise, lower or balance the trailer.
• Height control valve - Automatically adds or releases air to maintain ride height.
• Air compressor - Generates compressed air fed into the suspension system.

Benefits of Air Bag Suspension

There are good reasons why air bag suspension is common on reefer trailers instead of leaf springs:

• Smoother ride - Air bags provide superior shock absorption over bumps.
• Reduced cargo damage - Minimizes shocks and vibration which cause load shifting.
• Better handling when empty - Bags keep trailer level when not hauling a full load.
• Height adjustment - Pressure can raise or lower the trailer as needed.
• Improved maneuverability - Air suspension gives a tighter turning radius.

When to Replace Reefer Trailer Air Bags

While air bag suspension lasts for years, the components do wear out over time. Some signs it's time to replace air bags include:

• Noticeable air leakage
• Excess bounce or instability
• Trailer leaning heavily to one side
• Difficulty maintaining ride height
• Visible cracks or holes in air bags

Catching problems early allows worn parts to be replaced before more serious issues develop. Routinely inspecting the air bag suspension system every few months enables necessary repairs to be made promptly.

Risks of Neglecting Bad Air Bags

Driving with damaged air bags can create safety hazards and lead to further damage:

• Cargo shifts from loss of stability
• Increased road vibration and noise
• Uneven tire wear from improper weight distribution
• Additional stress on suspension components
• Potential tire blowouts or wheel damage from bottoming out

Catching problems before complete air bag failure occurs reduces risk and saves money compared to extensive repairs later on.

DIY vs Professional Air Bag Replacement

Some mechanically inclined owners choose to tackle air bag replacement themselves. However, reefer trailer suspension systems can be complex. Attempting repairs without proper tools and expertise may cause issues like:

• Air leaks from improperly sealed fittings
• Valve or compressor damage from incorrect installation
• Ride height problems if bags are undersized or mounted incorrectly
• Continued air leakage that’s difficult to trace

A professional mechanic has the specialized equipment, training and experience to replace air bags efficiently. This avoids comebacks or creating bigger problems. They also handle disposing of old parts properly.

Cost of Professional Air Bag Replacement

Typical costs for a full air bag replacement range from $500 - $1,200 depending on the shop location, number of bags and any other repairs needed. While spending that much isn't ideal, it pales compared to potential cargo claims or damaged equipment from air spring failures.

Summary - The Importance of Functional Air Bags

The air bag suspension on reefer trailers plays a vital role in protecting delicate freight. Worn out air bags lead to bounce, instability and difficulty maintaining ride height. Catching problems early and having air bags replaced professionally minimizes risk while providing peace of mind that your suspension can handle anything the road dishes out.