INTRODUCTION
Welcome to the Dunlop Systems and Components range of auxiliary air
suspension kits. As this catalogue shows, a wide range of solutions are
available to suit a multitude of vehicle variants.
Auxiliary air suspension is fitted in tandem with the standard steel springs of the
vehicle suspension, and provides enhancements in terms of both the stability of
the vehicle and the comfort of the passengers…
Vehicle Levelling
Simply by varying the air pressure in the springs, the vehicle can be
levelled both front-to-rear and side-to-side. Keeping the vehicle level
optimises stability, ensures correct headlamp beam distribution and
reduces tyre wear arising from uneven distribution of weight.
Straight Line Stability
Straight line stability is greatly increased at higher speeds, and when
subjected to buffeting from cross-winds or large overtaking vehicles
Reduced Body Roll
Body roll when cornering or negotiating roundabouts is significantly
reduced.
Fatigue Reduction and Wear Compensation
Suspension fatigue is reduced, so helping to prevent leaf springs from
sagging under repeated or constant loading.
Any sagging already present can be compensated-for. This is a particular
benefit for motorhomes, which are always fully laden.
Ride Comfort
Air springs help to absorb shock loads from uneven road surfaces,
therefore general ride quality is much improved.
...and furthermore...
• Dunlop is an internationally recognised brand, approved by TUV
• Dunlop Systems and Components is an air suspension specialist with a
history spanning more than 50 years, supplying in excess of 250,000 air
springs per year
• Each system offered is optimised in terms of comfort and flexibility, by
designers drawing from an extensive range of air springs and bellows
• Double and triple convolute bellows (i) are capable of operation at
relatively high pressure, enabling a correspondingly high axle load to be
supported and (ii) offer an extended suspension stroke, so providing a
wide adjustment range for vehicle levelling
Disclaimer
Every effort has been made to ensure the accuracy of the information provided
in this catalogue in respect of original equipment manufacturer vehicle data.
However, Dunlop Systems and Components shall not be held liable for any
inaccuracies that may be contained herein.
VERY IMPORTANT NOTES
Gross Vehicle Weight (GVW)
Air assist kits are not in themselves designed to increase
the gross vehicle weight (GVW) rating of a vehicle. They
do not legally allow for carriage of a load greater than the
carrying capacity stated on the data plate of the vehicle.
Do not exceed the maximum load specified by the vehicle
manufacturer…
• to avoid compromising passenger safety
• to prevent possible damage to the vehicle
• for legal reasons
Load Sensing Valve (LSV) Adjustment
If your vehicle is not fitted with an antilock braking system (ABS)
then it will have a load sensing valve (LSV) to automatically
adjust braking force under varying load conditions. This valve
must be adjusted immediately after the fitting of an air assist kit
and before the vehicle is driven again on public roads.
If the LSV is not adjusted following the fitting of an air assist kit,
it may misjudge rear load conditions to the extent that the
braking pressure applied to the rear brakes is not correct (e.g.
the rear wheels may lock with no load on the rear axle). The
consequences of this in terms of vehicle stability and safety are
potentially serious.
Vehicle Uprating
Despite the above words of caution, it is possible to upgrade the weight
rating of your vehicle. This must be carried-out by a specialist supplier
that will…
• carry out any necessary modifications in addition to fitting the air
assist kit
• complete documentation as necessary to inform the Vehicle and
Operator Services Agency (VOSA) – a mandatory requirement
• supply and fit a new weight plate to replace the original plate
supplied with the vehicle
This process applies to United Kingdom registered vehicles. The process
in other countries may be different.
Maintenance
The system does not require very much maintenance other than…
- to maintain air pressure in the springs. Much like a tyre, the system
may lose a little air over time.
- to keep the air bellows clean. It is suggested that, when washing the
vehicle, the bellows are inspected and cleaned as necessary. Look in
particular for stones or grit trapped between convolutes, as this may
damage the bellow.