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|Dunlop Air-Assist Suspension - Semi-Air||
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Quote: " ... Kit was fitted today - many thanks for the very prompt delivery. Initial impressions are that it's exceeding my expectations and both handling and ride are considerably improved, even though I haven't played about with pressures at all. I set both sides to 2 Bar and it feels about right - although the ride height has increased by a few cm. Thanks for your excellent service and delivering a very good product". PF.
Semi-Air Suspension by Dunlop: One of the very best ways to fix a saggy bottomed motorhome! How do we know? I've driven a few and the one with air springs was the best of the lot. Also now that the once cheap extra coil springs are so much more expensive, airbags are the really obvious choice.
Sag disappears but so does the wallow and a lot of the roll, resulting in an altogether better drive with better stability on motorways and an overall better ride too.
The assistance is easily user adjustable via simple air pressure changes, even with side to side differences to compensate for some uneven loading - typical of layouts with offset fridges, water tanks, etc. As a result of course suspension fatigue is pretty much halted as the air bellows take much of the strain. Shock absorbers may last longer too. Ideal to improve - motorhome - motorcaravan - camper - campervan - 'dormobile' - 'caravanette' - however named!
All are designed for vehicles with Rear Leaf Springs do please get under and look before ordering!
Huge Range of 'Van' Applications: to suit the usual - and some unusual - motorhome base vehicles. As fitted to our own motorhome. If you have a specific vehicle interest not listed we'd be pleased to try to help - apart from motorcaravanning I once worked as a techie in a Firestone factory making airbags.
A-Class / Alko Chassis? Sorry no. Problems with Alko often lie in the suspension itself and adding airbags will not solve it and could even make it worse. Alko rear chassis can be fitted to standard van cabs to give improved ride characteristics and will usually use a more sophisticated suspension not the normal van 'cart springs'. Dunlop do offer Al-Ko systems but this is a professional, specialist supply & fit task not DIY. All this often applies to A-class motorhomes and some C-class coachbuilt motorhomes so you may need to find out more about your chassis specification - a quick look will establish if leaf springs though!
Std Chassis? If simply standard Fiat or Peugeot e.g., then our kits will be fine, a key feature of 'standard' is a solid axle with leaf with spring rear suspension (similar to picture right). These may have a single or multiple leafs / leaves and may be from any of the main manufacturers, incl, Fiat, Ford, Renault, Mercedes, VW, etc. Look under your vehicle to check you do actually have leaf springs ; do look it isn't possible to check from your armchair!
Why Dunlop and not say Air-Ride? We've nothing against Air-Ride™ or indeed Drive Rite™, and they've made a great job of bringing the technology to our rather ordinary van chassis rather than just to specialist trucks, trains, ambulances, buses, etc. Full or Semi-air suspension is even used on high end cars from Rolls Royce, Mercedes and Range-Rover but do note we're only talking Semi-Air here. i.e. air assisted suspension mostly sitting between the rear 'cart springs' and chassis where maximum stability can be achieved, often replacing 'bump stops' which also act as high load spring assisters on some vehicle chassis (some Ducato included). We have high confidence in the quality of the Dunlop units so offer a 5 year warranty construction and material on top of the standard 2 year Dunlop version, there will be some extra evidence required on our 5 year version - but nothing unreasonable. All our Dunlop kits are RDW approved and many of the popular vehicle kits are also TUV approved, all Ducato-Boxer and many Transit & Sprinter e.g.
So why Dunlop? Well just look at the Dunlop product features: Dunlop is an internationally recognised brand, approved by TUV • Full 8" 200mm dia airbags/bellows - and size really matters in bellows giving better ride and more progressive suspension at quite modest air pressure, long life too • Anodised rather than painted metal components • Captive nut air connections for long life and reliability • Dunlop Component warranty 2 years. Our materials and construction limited warranty 5 years • Great instructions and support. • Quality product, development and customer service from a quality European company at very reasonable prices. • Zero returns/claims here. So as my offspring say - What's not to like?
Fitting or DIY Kits? We don't offer fitting but do offer a range of kits for DIY fit or for workshops / mobile engineers to fit for you. The Rear Semi-Air Suspension Kits are the most popular. The price of the kits ranges from the basic version with two simple air inlet valves that you use to inflate the airbags to the desired pressure right up to deluxe versions with built-in heavy duty 12v compressors & gauges for push button operation from the cab. All options are viable and offer the same height and ride improvement, it is just the inflation convenience that changes - our modular presentation means you can choose the basis kit to suit your particular vehicle and optionally choose an extra inflation module that suits your needs.
This Modular System offers four 'levels' for you to choose to features you need. In essence: Level 1 is the basic vehicle-specific airbag & brackets kit with just external Schrader valves for inflation as above right. Level 2 is with an added gauge kit usually installed in the cab footwell (very popular) as pic left but a limited range of other gauge panels might be used. Level 3 is with an added on-board compressor & gauge panel kit (some panel options are available). Level 4 adds an air reservoir to the on-board compressor for instant adjustments but do note that pressurised air reservoirs do need regular maintenance, inspection and certification!
The Level 1 Basic Airbag Kit is the simplest and cheapest with the twin Schrader valves being just like topping up your tyres one at a time using the supplied valves - these valves are often installed in the rear bumper. These basic kits are vehicle-specific and include the fittings pictured above and right - airbags, brackets, airlines, twin valves and ties, Getting accurate pressure adjustments can be tricky. The optional and popular on-board Footwell Gauge Kit Level 2, is pictured above left - this "Gauge & Twin Valve Kit" is supplied with extra length airlines to reach the cab and this allows inflation, with gauge readout, either together or separately. This gauge kit makes accurate pressure adjustment a doddle and is our most popular option and now supplied with 5mm connectors (just for info, older kits will have 4mm airline and connectors)The gauges are available in LH-Gauge, RH-Gauge, and Vertical-Gauge types to suit different fitting positions, vehicles like Sprinter and Express often use a Vertical gauge fitted on a cupboard or seat box while in the Ducato-Boxer range the gauges are often situated at the back of the the drivers footwell out of the way of feet and would normally use LH-Gauge for LHD and RH-Gauge for RHD - this idea isn't fixed though, my own gauge kit is fitted in the passenger footwell so uses the opposite to the 'norm'. The RH-Gauge / RHD version is pictured in the kit just above left while the LHD version is pictured lower right alongside the Vertical version, you can of course choose whatever orientation suits your desired location just take a quick look underneath to decide where the airlines will run along the chassis and the angle of entry into the footwell. Although not essential this gauge kit does add both convenience and consistency at a very reasonable price so is highly recommended. Please note adding it later is quite a bit more expensive A Level 3 Compressor Kit may be needed to create a fully deluxe installation, this is far from cheap so it does add quite a bit to the overall price - but you do get lots of convenience, reassuring reliability, and easy & quick changes in pressure to change level or rear ride height whenever you want, boarding a ferry, loading the homecoming wine supply or just pitching up for example. All the same functions can be carried out with a portable pump of course, an on-board compressor simply adds extra convenience. Level 4 adds an Air Reservoir Tank for instant changes to bag pressure but since it needs extra maintenance and also regular safety inspection it is not popular. These extra / deluxe features are ordered as extra modules - upgrades to the basic kits. If planning such later upgrades remember to route the airlines to a suitable location at the outset and/or be prepared to invest in more airline when upgrading! If you have a good idea about the real detail of your future plans it may be a good idea to tell us about them before ordering so we can help to keep redundancy minimal. However, it is all fairly straightforward for the most popular kit only or kit + footwell gauge & valves. To order, choose a vehicle kit and add any gauge/inflation option.
Why a gauge kit? Our expert says - "Some people manage without them, however if your dexterity is not perfect you may wish to consider a basic gauge kit. When you fill a normal vehicle tyre with air, you always get a 'pssst' at the end, that small loss of air is nothing compared to the volume of air inside the tyre, however if you have the same loss of air when inflating the bellows on this air assisted suspension system, you can easily lose a fair bit, up to half in extreme cases, so instead of having say 30psi, you end up with 20psi or even 15psi. Some users over-inflate to allow for the loss of air, but it takes a while to get the knack of getting it right. Even using a tyre pressure gauge or external pump allows loss of air. With one of the simple gauge kits with taps, there is no loss when checking pressures due to the built in taps". But is it essential? No just highly recommended, especially with the basic footwell kit being very affordable when purchased along with an airbag kit (pics above & right). Info NB: Dash Gauge panels are either 6-hole as pic right or 5-hole such as the X250 panel. The 6-hole is supplied with the compressor+tank kit and is not compatible with the X250 panel.
Your Vehicle: We/you will need to know a bit about your vehicle to
get the right kit.
main thing is the chassis. Importantly, is the chassis standard Fiat Ducato,
Peugeot Boxer, Mercedes Sprinter, Renault Master, Iveco Daily, whatever, or one of the the special AlKo rear chassis for motorhomes?
We cannot help with those. What is the model build year? - this is based on chassis build dates and not registration
dates which can lag far behind when motorhomes are involved! (our own
registered as new - 22 months after chassis build!). Model year changes can usually be identified visually - so if in
doubt about yours checkout these great Wikipedia links, each offers a wealth
of information and invaluable vehicle pictures for model/series
identification (Google image searches can be useful too) ...
Also if a brake-height sensor (Load Sensing Valve or LSV) is fitted you may need to get under the vehicle to identify and/or possibly photograph the LSV type. This is then compared with the Dunlop info/instructions to get the right sensor version in the Dunlop kit. A typical schematic for 94-02 Ducato is shown above left and we offer LSV pictures of the two X230 types below. Apart from differences in the kits, the LSV is often adjusted on installation to maintain rear brake efficiency at the increased ride height when fully loaded. ABS brakes can also be a consideration issue especially where a model range came both with and without ABS brakes. In some kits there are additional components, in others none are needed, in some an adjustment is required, each is chosen to be correct for its particular vehicle type and specification. Sometimes the LSV is effectively disabled by the kit (correctly) but do not remove it - makes for an easier MOT.
If in doubt please don't guess but consult the Dunlop literature and if still unsure.
Originally marketed as AJV, these are far superior kits but apparently similar to others on the market!
Stock? Most of the more popular later vehicle kits are stocked in the UK Airbag warehouse. Older and less popular kits are stocked at Dunlop Netherlands, these take about week +/- to arrive here.
Heavy / Maxi Chassis? The normal single-axle heavy chassis of maybe 3.8t or 4.2t still takes the same kit. These airbags are offering suspension assistance not replacing the suspension and will cope just fine.
Which LSV Type? - check under your 'van to see which you have and compare to any photos below. NB: You must look, you cannot do this from your armchair!
Alko Torsion Suspension Kits? Sorry no. The problem with Alko is usually in the suspension itself and adding airbags will not solve it - may even make it worse. This is a professional, specialist task. This often applies to A-class motorhomes so you will need to find out quite a bit about your A-class chassis spec.
For Dunlop Auxiliary Air Systems Catalogue - as PDF 50pp & 5Mb in new window/frame - click here This shows the range of vehicles covered along with the system graphic for each.
Instructions for each system we offer will be uploaded here shortly but also
Outline Guide to the Kits Range with click-links to the Marques ...
Fiat Ducato Mk1 & Talbot Express 1984-1993 Build with Fiat / Talbot Rear Leaf Springs
Basic kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting hardware for Round section axle, Twin Schrader manual inflation point. LSV: Adjustment is required on installation. This is fairly straightforward, I did it myself many years ago when fitting spring assisters. Buy below >>
Ducato-Boxer-Relay-Jumper X230 1994-2002 Build with Fiat-Peugeot Rear Leaf Springs
Basic kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting hardware for square section axle 75x75, Twin Schrader manual inflation point. Two different LSV types as under.
Straight Rod & Coil Spring pictured below - Left
Ducato-Boxer-Relay-Jumper X244 2002-2006 Build with Fiat-Peugeot Rear Leaf Springs
Basic kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting hardware for square axle 75x75, Twin Schrader manual inflation point.
LSV: = Straight Rod & Coil Spring as pictured above - on Left
There are 2x versions for X244 - with one being for ABS brakes,
PS: do note the different headlamps to the X230 above, very important around 2002 and sometimes 2003, they are smooth & clear (std X230 has ribbed glass). Also X244s have the washer jets set into the bonnet.
Ducato-Boxer-Relay-Jumper X250 ABS 2006-14 Build fitted with Fiat-Peugeot Rear Leaf Springs
The X250 chasss was released in late 2006 but many converted vehicles like motorhomes weren't sold until 2007 so there are 2007-reg vehicles on both older and newer chassis - use the picture right to identify the later type. The same mixed build & registration dates apply to the 2014 change, that latest model is pictured just below. The Basic Semi-Ait Kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting hardware for square section axle 75x75, Twin Schrader manual inflation point. The X250 model is fitted with ABS brakes. Buy below >>
Ducato-Boxer-Relay-Jumper X290 ABS 2014-Date Build with Fiat-Peugeot Rear Leaf Springs
The X290 / Euro-6 chassis is fundamentally similar to the X250 and takes the same kit. There are however minor differences in brackets and cables at the rear and these require small tweaks as part of the fitting procedure - download an instructions upgrade/supplement PDF by clicking here. The picture right shows a Fiat X290 van but the cab is the same for most motorhomes apart from the slight differences between the Fiat, Citroen & Peugeot styling around the radiator grill. As with the X250 the same basic kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting hardware for square section axle 75x75, Twin Schrader manual inflation point. This model is also fitted with ABS brakes. Buy Below >>
Mercedes 207/307/208/310 to-1994 Build with Mercedes Rear Leaf Springs
Kit no longer available from the major manufacturers but we can offer a locally assembled kit based on the Dunlop major parts. Our Basic kit includes: Airbag assemblies x2, Airline tubing x2, Mounting hardware for Round section axle, Twin Schrader manual inflation point. LSV: Adjustment required. Buy Below >>
Mercedes 208D/316CDI 408D/416CDI 95-06 Build with Mercedes Rear Leaf Springs
The First Generation or T1N, 95-06 with one facelift (pictured). Our basic
kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting
hardware for Round section axle, Twin Schrader manual inflation point.
Gauge sets are optional as ever.
NB: There are 2 versions for 208D/316CDI - with one for ABS brakes, which type is yours? Buy >>
Mercedes Sprinter 2006-on 200, 300, 400 & 500 series Rear Leaf Springs.
Also known as the Second Generation or NCV3 introduced in late 2006 and updated in late 2013 (Euro VI), there were styling changes to headlamps and radiator grille too but fairly subtle. All have ABS so no awkward airbag kit choices within the models. Our basic kit includes: Airbag assemblies x2, Airline tubing x2, Galvanised mounting hardware for Round section axle, Twin manual inflation point. Buy Below >>
Iveco Daily with Rear Leaf Springs Buy Below >>
We believe the 2014-on L & S models are more straightforward, you can check the illustrations in the IVE-LS14CM (MLD-LIVELS14CM) by downloading the Dunlop 2014-on Iveco Instructions here (click).
Renault Master / Vauxhall Movano / Nissan Interstar NV400 Range - Four versions are offered for Master, one for the earlier 1998-2010 round axle model (some late registrations of course), and three for the 2010/2011-on models. Those three are - one for the square axle, one for the round axle RWD single wheel and one for the round axle RWD twin wheel model. There are subtly different kits for Movano with just two types covering the 1999-2010 & 2011-on, similar as for the Nissan Interstar too. Buy Below >>
VW T4 etc? Sorry no, coil spring suspension so any airbag would have to go inside the spring to make engineering sense - probably easier and cheaper to simply replace the coils springs? (/shocks?)
VW Crafter: For 2006-2017 was the same chassis and running gear as Sprinter but we have listed them as separate items for Crafter 28-35 and crafter 46/50 in the VW Crafter & LT section below. Buy Below >>
Transit Range - tricky choosing, some will be straightforward some will require consultation / pictures, please see the info in the purchasing section below. Buy Below >>
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