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Trailer Videos

ZMD vs. Spring

Over the years, we’ve tried many unconventional ways to try and show how much better ZMD is than a traditional leaf spring design.

ZMD vs. Spring

MAXX22T  Optimized Air Disc Brakes

Hendrickson MAXX22T offers significant weight savings over similar designs.

MAXX22T Optimized Air Disc Brakes

TIREMAAX® PRO Tire Pressure Control System

The TIREMAAX® PRO trailer tire pressure control system helps fleets and owner operators in their efforts to minimize costly tire wear and improve productivity and fuel mileage.


ZMD® Zero Maintenance Damping

This patented air spring provides uniform and consistent damping over the life of the air spring.

ZMD - Zero Maintenance Damping


There are two ways to increase the lift when using a UBL system.

   Option 1: Increase Ride Height

  • Suspension components vary according to ride height. Therefore, refer to Hendrickson Customer Service to determine component suitability before considering a change in ride height.

   Option 2: Convert to a Hendrickson low-ride suspension, if possible.

  • If currently using a Hendrickson top-mount suspension consider switching to a Hendrickson low-ride suspension, to help provide more lift when using a UBL system.
  • Remember, the original manufacturer of the trailer should be contacted for approval and recommendations before making any modifications to the trailer.

For additional assistance regarding specific trailers or applications, contact Hendrickson Customer Service in Australia phone +61 3 8792 3600 or email, in New Zealand  phone: +64 9 570 4721 or email 

Start with choosing products, such as genuine Hendrickson suspensions and parts, which offer good corrosion-resistant coatings.

Second, work with the component supplier to determine the proper coating cleaning and maintenance specifications and implement a cleaning/maintenance schedule to extend the life of the coating.

Regular inspections will also help to identify corrosion issues early enough to address the issue before it becomes a bigger problem.


TIREMAAX PRO units are set to a specified target pressure for inflation. As long as the pressure in the trailer air tank is above the target pressure, the TIREMAAX controller will continuously supply and maintain tire pressure at target.

With TIREMAAX PRO, all check valves or wheel valves are open to allow air flow in both directions, equalising pressure across all wheel positions. It can also relieve pressure from over-inflated tyres. The relief pressure is set at 10 psi above the cold target pressure. If tyre pressure goes above this setting, the TIREMAAX PRO controller will exhaust air and maintain pressure at the pre-set relief value.

No. Brakes should be chosen based on the highest required load and no higher. For instance, hub, suspension, axle and tire ratings may all differ on a given trailer, ranging from 7,700 kg to 12,000 kg (17,000 to 26,000 pounds) or higher depending on the trailer application.

However, it is the minimum rated component of this group that determines the gross axle weight rating (GAWR), and brakes should be sized according to the GAWR.

Using an overrated brake lining on your application can lead to excess brake torque which can result in tyre wear, brake wear, noise and trailer hop.

Please refer to the Ride Height placard that was fitted to the trailer during manufacture. If the placard cannot be located or is unreadable, please contact the trailer manufacturer or Hendrickson Customer Service with any identification details that are still available, such as the suspension identification plate number.


Shockless ZMD

ZMD® technology eliminates shock absorbers from the maintenance equation by integrating the damping function traditionally performed by the shock within the air spring itself.

Hendrickson Academy

Service Academy

A Hendrickson service education portal to gain a greater knowledge on how to service Hendrickson products.  Register to start learning today.

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