If you own a heavy-duty truck or trailer equipped with a Holland air suspension system, you know that keeping it in good working order is essential for ride quality, load stability, and safety. When it comes time to replace components—whether it’s air springs, height control valves, or shock absorbers—you need parts that match the original specifications. This guide covers the most common Holland air suspension parts, how to identify the correct ones for your vehicle, and what to look for when purchasing replacements.
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Saf Holland 90557249 - Air Spring
Understanding Holland Air Suspension Systems
Holland (now part of SAF-Holland) produces a range of air suspension systems for commercial vehicles, including the popular Holland AD, AD-HD, and ADZ series. These systems use air springs (also called air bags) to support the load, along with shock absorbers, leveling valves, and various brackets and hardware. The key advantage of air suspension is its ability to maintain a consistent ride height regardless of load, reducing driver fatigue and protecting cargo.
Each Holland system is designed for specific axle capacities, ride heights, and vehicle configurations. For example, the Holland AD series is common on trailers, while the AD-HD handles higher gross vehicle weight ratings. Knowing which series your vehicle has is the first step in selecting the right parts.
Common Holland Air Suspension Parts That Need Replacement
Air Springs (Air Bags)
Air springs are the most frequently replaced component. They are made of reinforced rubber and can develop leaks, cracks, or bulges over time due to ozone, road debris, or age. Holland air springs are available in single and double convoluted (rolling lobe) styles. When replacing, you must match the original diameter, mounting style (stud top and bottom, or with plates), and operating pressure rating. Using the wrong air spring can cause improper ride height or premature failure.
Height Control Valves (Leveling Valves)
The height control valve adjusts the air pressure in the springs to maintain a preset ride height. Over time, the valve’s internal seals may wear out, causing the suspension to leak down or fail to level properly. Holland valves come in left-hand and right-hand versions, with different lever arm lengths. Always replace with the exact OEM part number to ensure correct function.
Shock Absorbers
Shocks dampen the oscillations of the air springs. If you notice excessive bouncing or a rough ride, the shocks may be worn. Holland-spec shocks are matched to the spring rate and damping requirements of the system. Choose shocks with the correct extended and compressed lengths, mounting eyes, and internal valving.
Bump Stops and Bushings
Bump stops prevent metal-to-metal contact when the suspension bottoms out. They degrade over time and should be inspected during spring replacement. Bushings in the pivot points (equalizer beam bushings, torque rod bushings) can wear, causing misalignment and abnormal tire wear. Replacing these with Holland-spec polyurethane or rubber bushings extends component life.
Air Lines and Fittings
While not always considered “parts” in the traditional sense, air lines and fittings are common failure points. Use DOT-approved nylon tubing and brass fittings rated for the system’s pressure. If you notice air leaks, check the connections at the height control valve and air spring ports.
How to Identify the Correct Holland Air Suspension Parts
Before ordering any replacement, locate the vehicle identification number (VIN) or the suspension serial number tag. On many Holland systems, a data plate is attached to the frame or the suspension crossmember. The plate lists the series (e.g., AD-205, AD-HD-300), the air spring part number, and the valve configuration. Write down this information to cross-reference with supplier catalogs.
If the tag is missing, measure the ride height (distance from the axle centerline to the frame reference point) at normal operating pressure. Also note the number of air springs per axle (usually one or two per side), the mounting style, and the distance between mounting holes. These measurements help determine the correct replacement.
Many online parts suppliers offer lookup tools by OEM number. You can also consult a SAF-Holland dealer or an experienced heavy-duty parts specialist. Avoid generic “universal” parts; they seldom fit correctly or provide the same performance.
Quality Considerations When Buying Holland Air Suspension Parts
OEM vs. Aftermarket
Original Equipment Manufacturer (OEM) parts from SAF-Holland guarantee exact fit and performance. They are made to the same specifications as the parts that came on your vehicle. Aftermarket parts may be cheaper, but quality varies widely. Some aftermarket brands are reputable and meet or exceed OEM standards, while others use inferior rubber or steel that fails prematurely.
For safety-critical components like air springs and height control valves, OEM or high-quality aftermarket (e.g., brands like Firestone or Hendrickson for springs) is recommended. For less critical items like bushings, a reputable aftermarket supplier can save money without sacrificing safety.
Material and Construction
Look for air springs with multiple plies of rubber and nylon cord for durability. Check that the mounting plates are heavy-gauge steel with proper corrosion protection. Height control valves should have brass or stainless steel internal parts to resist moisture damage.
Warranty
OEM parts typically come with a warranty of one to two years. Some aftermarket brands offer similar coverage. A longer warranty is often a sign of better quality, but read the fine print to understand what’s covered (e.g., labor vs. parts only).
Where to Purchase Holland Air Suspension Parts
You can buy Holland air suspension parts from:
- Authorized SAF-Holland dealers (best for OEM parts and expert advice)
- Truck parts distributors like FleetPride, Motion Industries, or local heavy-duty repair shops
- Online retailers specializing in heavy-duty parts (e.g., FinditParts, TruckPro, or Reliable Parts)
When buying online, compare prices and shipping costs, but prioritize sellers with good return policies and customer support. Avoid auction sites or third-party resellers with unknown credentials.
Practical Tips for Replacement
- Inspect related components: When replacing air springs, check the condition of the shocks, height control valve, and air lines. Replacing worn parts in one go saves labor later.
- Use new hardware: Always install new lock nuts and washers. Old hardware can loosen over time.
- Follow torque specs: Over-tightening can damage the springs or brackets. Refer to the service manual for the correct torque values.
- Test ride height: After installation, adjust the height control valve to the specified ride height (usually 6 to 8 inches for most trailers). Bleed the system to reset the valve level.
- Check for leaks: Apply soapy water to air fittings and the spring surface to confirm no air leaks before putting the vehicle back in service.
Common Mistakes to Avoid
- Mixing different brands of air springs on the same axle: This can cause uneven loading and handling issues. Always replace in pairs (both sides) of the same brand/model.
- Ignoring the height control valve adjustment: Even if the new parts are correct, improper valve setting will cause the suspension to either ride too high (stiff) or too low (bottoming out).
- Using incorrect ride height: Using a different ride height than designed can alter the driveline angles and cause vibration or u-joint wear.
- Overlooking the importance of shock absorbers: Some owners skip shocks to save money, but that leads to uncontrolled oscillations and premature air spring wear.
Final Recommendation
For most operators, replacing Holland air suspension parts with OEM components is the safest choice. The peace of mind from knowing the exact fit and durability is worth the higher upfront cost, especially for vehicles that see daily use. If you are on a tight budget, choose aftermarket parts from established brands like Firestone or Hendrickson for air springs, and stick to OEM for height control valves and any electronic leveling components.
Before purchasing, verify your suspension’s serial number or take careful measurements. Spend time comparing prices from a few reputable suppliers, and don’t forget to factor in warranty and return policies. Proper installation and routine inspection will extend the life of your Holland air suspension, keeping your truck or trailer riding smooth mile after mile.