► Hardie Hose | Airbrake Tubes

J844 Nylon Tubing for Heavy Vehicle Air Brake Systems

Heavy-vehicle air systems demand the right tubing for the vehicle, fittings & workshop environment. Hardie Hose | Airbrake Tubes give truck, trailer & fleet workshops a broad choice of nylon J844 airbrake tubing across multiple sizes, colours & coil lengths.

Start by confirming the tube specification & outside diameter (OD). From there, check fitting compatibility, required colour identification & how much tubing the workshop actually needs.

► Range: Hardie Hose airbrake tubing across multiple sizes, colours & coil lengths
► Tube type: Nylon J844 airbrake tubing for professional vehicle applications
► Common applications: Truck, trailer, fleet & heavy-vehicle air brake systems
► Choosing your tube: Match the required specification, outside diameter (OD), fitting compatibility & coil length
► Colour options: Black plus selected blue, green, red & yellow airbrake tubing
► Coil lengths: Choose shorter lengths for individual repairs or larger coils for regular workshop & fleet use
► Trade tip: Use colour for line identification where applicable — always confirm tube specification & size for compatibility

Maintaining more than the air line? Explore Automotive & Mechanical for related workshop equipment.

Choose the airbrake tubing that matches the vehicle & repair requirements from the range below.

Airbrake Tubing Is a System Component – Not Just a Length of Nylon

Airbrake tubing carries compressed air through pneumatic braking systems, connecting components across trucks, trailers & heavy equipment.

Because those systems are safety-critical, replacement tubing should never be selected by appearance alone. A professional workshop needs to confirm the required tube type, outside diameter, fitting compatibility & vehicle requirements before installation.

Typical users of Hardie Hose airbrake tubing include:

► Heavy-vehicle workshops
► Fleet maintenance teams
► Truck & trailer repairers
► Transport operators
► Agricultural machinery workshops
► Commercial vehicle service centres
► Mobile mechanical technicians
► Heavy-equipment maintenance teams

For related braking components, browse Brake Components & Kits.

Size First, Colour Second

Colour can help a technician identify a line more quickly but it should never be the first selection criterion.

The correct process starts with the tube itself.

Check:

► The existing tube markings
► Outside diameter
► Required J844 specification
► Fitting compatibility
► Vehicle manufacturer requirements
► Existing colour identification where relevant
► Required repair length
► Routing conditions around the chassis or equipment

Two tubes that share the same colour are not automatically interchangeable.

Likewise, a tube that appears close in diameter may still be incorrect for the fitting or system.

One Workshop Repair & Fleet Stock Are Different Buying Jobs

A single truck repair doesn't need the same purchasing strategy as a fleet workshop servicing similar vehicles every week.

For occasional repairs, a shorter coil can minimise unused stock.

For fleet maintenance, longer coils of frequently used sizes can reduce repeated ordering & keep common tubing ready when vehicles enter the workshop unexpectedly.

Before choosing quantity, consider:

► How often the workshop uses that tube size
► Which vehicles share the same specification
► Typical repair lengths
► Existing workshop stock
► Colour requirements
► Storage space
► How quickly the material is consumed
► Whether multiple vehicles show similar wear patterns

Industrial Shed's on -site & workshop Services can support businesses managing recurring workshop requirements.

Find the Cause Before You Fit the Replacement

A damaged tube can tell you more than where the leak is.

If an airbrake line has worn through, split, kinked or failed close to a fitting, inspect the complete route before installing the replacement.

Abrasion

Look for rubbing against brackets, chassis sections, edges or neighbouring components.

Movement & Vibration

Repeated movement can stress tubing around unsupported sections & fittings.

Routing Problems

Poor routing may create tight bends, unwanted contact points or movement the original installation was designed to avoid.

Heat Exposure

Check whether nearby components or operating conditions expose the tubing to unsuitable heat.

Failed Supports

Loose, missing or damaged supports can allow a correctly specified tube to move into damaging areas.

Previous Repairs

Older repairs deserve close inspection. If the same location has failed more than once, the problem may lie in the installation rather than the tubing itself.

Replacing the damaged section solves the immediate fault. Correcting the cause helps stop it returning.

Airbrake Tube Selection Guide

A large range becomes easier to navigate when each buying decision is handled separately.

Confirm the Existing Tube

Read any printed markings before removing the old line. Record size, colour & routing while the information is still visible.

Match the Outside Diameter

OD needs to match the intended fitting & system. Avoid selecting by eye.

Confirm the Required Tube Specification

General pneumatic tubing should not automatically be substituted simply because it looks similar or shares the same nominal diameter.

Inspect the Connections

A new tube won't correct a damaged, worn or incompatible connection.

If wider fault-finding is required, Vehicle Diagnostic & Testing Tools can support workshop diagnosis.

Select Colour Where It Has a Purpose

Match an established colour-identification system where one is already in use. Don't introduce arbitrary colour changes that may make future servicing harder.

Choose the Coil Length Around Actual Demand

Buy enough for the repair & realistic workshop usage rather than automatically defaulting to the smallest or largest quantity.

What a Good Workshop Checks Around the Failed Line?

Experienced technicians don't stop their inspection at the visible damage.

While access is available, look around the wider installation for signs of developing faults.

► Adjacent airbrake tubes
► Fittings & connection points
► Clips & supports
► Abrasion marks
► Chassis contact points
► Heat exposure
► Previous repair areas
► Kinks or flattening
► Unusual movement
► Nearby components showing damage

For hard-to-see areas around chassis & mechanical assemblies, Inspection Mirrors & Lighting can make tracing lines & inspecting routing easier.

For a broader look at real workshop fault-finding, read A Day With An Automotive Mechanic Peninsula.

Stock Smarter for Fleet Maintenance

Keeping every possible tube size in bulk is rarely necessary.

Instead, use workshop history to identify which sizes are repeatedly consumed across the vehicles you maintain.

A practical fleet stock review should ask:

► Which OD sizes were used most often?
► Which vehicles share the same tubing specification?
► Which colours are regularly required?
► How quickly are opened coils consumed?
► Are partial coils labelled clearly?
► Are technicians repeatedly waiting on the same size?
► Are tubing coils stored cleanly & without avoidable damage?

That turns airbrake tubing from an emergency purchase into a planned workshop consumable.

For broader equipment preparation, Spring Jobsite Prep Getting Your Gear Ready provides additional workshop-readiness ideas.

Airbrake Tube Repairs Often Involve More Than Tubing

A truck or trailer coming in with an air-system fault may require more than a replacement line.

Depending on the diagnosis, the job can involve braking components, lifting equipment, inspection tools & general mechanical repair gear.

For access during vehicle servicing, browse Lifting & Jacking Equipment.

For broader repair requirements, see Car Repair & Maintenance.

Businesses managing repeat workshop purchasing can also access Trade support Solutions.

Expert Tips Before the Vehicle Goes Back Into Service

Airbrake work rewards careful preparation.

► Identify the tube before removal
► Confirm specification & OD
► Record the original route
► Inspect clips & supports
► Check fitting condition
► Make clean, square tube cuts
► Avoid crushing or deforming tube ends
► Prevent tight stress points beside fittings
► Protect tubing from abrasion
► Investigate recurring failures
► Check nearby lines for similar deterioration
► Complete the required inspection & testing before returning the vehicle to service

Air brake systems are safety-critical. Repairs should be completed by appropriately qualified personnel in accordance with applicable vehicle manufacturer requirements, workshop procedures & regulations.