The Airbag Man RR4634 helper kit suits Mazda BT50 B32 4x4 and 4x2 Hi-Rider models built 2011-2020, pairing Firestone air springs with the factory rear leaf spring pack to eliminate load sag. Pressure is adjustable from 5-100 PSI through an in-cab valve, so you match support to an empty tray or a loaded canopy and caravan in seconds. It bolts between the spring pack and chassis with no drilling and suits factory-height or 2" lifted BT50s. In stock in Australia, backed by a lifetime Firestone airbag warranty and fitment support from our team.
Browse all compatible suspension parts for your Helper Kit Mazda Bt50 2011-2020 using our parts finder.
| Make | Model | Series | Years | Engine |
|---|---|---|---|---|
| Mazda | BT-50 | B32 4x4 | 2011-2020 | 3.2L Diesel |
| Mazda | BT-50 | B32 4x2 Hi-Rider | 2011-2020 | 3.2L Diesel |
Not sure if this fits your vehicle? Contact our suspension experts or check our FAQ page.
Start around 20 PSI unloaded and adjust up as accessory weight or towball download increases, running toward the 100 PSI ceiling only under maximum GVM loads. Rear accessories that typically call for more airbag pressure include steel or aluminium canopies, toolboxes, water tanks, dual battery trays, drawer systems and long-range fuel tanks. For towing, a caravan or camper trailer towball download of roughly 200-350kg is common on a BT50, and airbag pressure should be increased to offset that download and keep the rear from squatting.
The RR4634 is suited to an experienced DIY fit or a suspension workshop, with typical fitment around 120 minutes using basic hand tools and the supplied instructions. Brackets bolt between the leaf spring pack and chassis rail with no drilling required. Wheel alignment is not mandatory for an airbag-only fitment since ride height under normal load is unchanged, but it is worth checking if you're also fitting upgraded control arms or a separate lift kit. After fitting, check air line fittings and bracket bolts are still tight after the first loaded trip.
Airbag Man has built air suspension systems for Australian vehicles for over 25 years, using Firestone airbags rated for local heat, dust and corrugations rather than generic imports. Every RR4634 kit carries a lifetime manufacturer warranty on the airbags themselves, backed by our local fitment support if you have compatibility questions. You can view the full Airbag Man range for other BT50 and 4WD applications.
The RR4634 suits BT50 owners who regularly carry tray or canopy loads, tow a caravan or camper trailer, or run a dual battery and water tank setup that loads up the rear. It's a practical add-on for tradies wanting to stop sag through the workday and for tourers wanting a level stance and steadier braking while towing. If your load varies a lot trip to trip, this airbag suspension setup lets you dial in support rather than living with one fixed spring rate.
The Airbag Man RR4634 is in stock now with fast dispatch across Australia, backed by a lifetime airbag warranty and fitment guidance from our team. If you're planning a bigger suspension upgrade alongside it, browse our full lift kit range or get in touch before you order.
New to BT-50 suspension? Read our guide to common BT-50 suspension problems and how to fix them.
The RR4634 is built for Mazda BT-50 B32 models from 2011 to 2020, covering both 4x4 and 4x2 Hi-Rider variants with the 3.2L diesel engine. It fits factory-height leaf spring rear ends as well as BT50s running a 2" lift. If your BT50 has had aftermarket leaf springs fitted, check with our team first as bracket clearance can vary. Contact our suspension experts if you're unsure about your specific build.
This is a helper kit, not a lift kit — it doesn't raise your BT50's ride height on its own. Instead, the Firestone airbags sit between the leaf spring and chassis and inflate to stop the rear from sagging once loaded, holding it at or near factory height. If you want an actual lift, pair this kit with a dedicated leaf spring upgrade or a full lift kit. The RR4634 does suit BT50s already running a 2" lift as well as factory-height vehicles.
The kit includes two Firestone airbags, mounting brackets for chassis and axle installation, an in-cab inflation valve, braided air line and fittings, and mounting hardware. Detailed fitting instructions with a QR code link to a video guide are also included. Leaf springs, shock absorbers and U-bolts are not part of this kit since it's designed to work with your existing rear leaf pack.
Yes. Increasing airbag pressure offsets towball download from a caravan or camper trailer, which typically sits around 200-350kg on a BT50, and keeps the rear from squatting under that load. A level rear end helps maintain front-to-rear brake balance and steering feel while towing. Many BT50 owners run lower pressure unloaded and wind it up before hitching a trailer.
No, this airbag helper kit works at the rear leaf springs and doesn't require any front control arm changes. Control arm upgrades are more relevant if you're fitting a front lift kit or coil spring upgrade at the same time. If you're planning a bigger suspension package, our team can advise whether upgraded control arms make sense for your build.
Wheel alignment isn't mandatory for an airbag-only fit like the RR4634, because it doesn't change your BT50's unloaded ride height or front-end geometry. It's still worth getting checked if you're fitting this alongside a separate lift kit or new leaf springs. For an airbag-only installation, most workshops don't include alignment as a required step.
The RR4634 doesn't come in different spring rate options — it's a variable-pressure airbag system rather than a fixed-rate spring, so you set support level by adjusting PSI from 5 up to 100. This gives you a wider working range than a single fixed leaf spring rate. If you need a fixed heavier-rate leaf spring as well, browse our leaf springs range for BT50-specific options.
Since this kit doesn't add ride height on its own, it won't create extra clearance for larger tyres by itself. Any tyre clearance gained on a BT50 comes from a genuine lift kit or raised leaf springs fitted separately. If you're planning larger tyres, talk to our team about a leaf spring or lift kit option that can be run alongside this airbag helper kit.
The Firestone airbags in the RR4634 kit carry a lifetime manufacturer warranty against manufacturing defects. Brackets and hardware are covered under standard Airbag Man terms. Keep your proof of purchase and contact our team if you ever need to make a warranty claim.
Yes, the RR4634 is designed to be run every day, with pressure wound right down for an unloaded, comfortable ride and increased only when you're carrying weight or towing. Because the airbags work independently of the leaf pack, they can absorb road shock without stiffening up the unloaded ride. Many BT50 owners leave it near the low end of the 5-20 PSI range for daily driving and adjust up only when needed.
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