AL-KO iQ7: Complete Buyer's Guide for Australian Trailers
If you're towing a large boat trailer, caravan, camper or other heavy trailer fitted with hydraulic brakes, choosing the right braking system is an important decision.
The AL-KO iQ7 is a power-assisted hydraulic brake actuation system designed to give the driver control of the trailer's hydraulic brakes from the tow vehicle.
Unlike a traditional hydraulic override braking system, the iQ7 receives an electrical braking signal from an approved in-car brake controller and converts that signal into hydraulic pressure at the trailer brakes.
One of the major differences between the iQ7 and many conventional electric-over-hydraulic actuators is its use of stored compressed air. This provides pressure ready for braking rather than relying solely on a hydraulic pump to begin building pressure after braking is requested.
For owners of larger trailers—and particularly hydraulic disc-braked boat trailers—the iQ7 provides a way to combine hydraulic braking at the wheels with braking control from the tow vehicle.
In this guide we'll explain how the AL-KO iQ7 works, which trailers it suits, Australian trailer braking requirements, brake-controller compatibility, installation, breakaway operation, maintenance and what you should consider before buying one.
What Is the AL-KO iQ7?
The AL-KO iQ7 is an electrically controlled, power-assisted hydraulic brake actuator.
In simple terms, it acts as the link between the tow vehicle's brake controller and the trailer's hydraulic braking system.
When braking is requested:
- The in-car brake controller sends an electrical signal to the iQ7.
- The iQ7 converts this signal into hydraulic braking pressure.
- Brake fluid transfers the pressure through the trailer's hydraulic brake lines.
- The hydraulic brakes at the wheels are applied.
This means braking effort can be controlled from the tow vehicle instead of relying solely on the trailer pushing against an override coupling to activate its brakes.
How Does the AL-KO iQ7 Work?
A key feature of the AL-KO iQ7 is its compressed-air pressure system.
Compressed air is stored within the system ready for braking. When the brake controller requests trailer braking, this stored pressure allows the actuator to apply hydraulic pressure to the trailer's braking system.
In simple terms:
Brake Controller → AL-KO iQ7 → Hydraulic Pressure → Brake Lines → Hydraulic Brakes
For the driver, the objective is fast, controlled trailer braking that responds to braking input from the tow vehicle.
Australian Trailer Braking Requirements
Understanding the braking rules is particularly important when dealing with larger trailers.
Australian trailer braking requirements are based on Gross Trailer Mass (GTM).
750kg GTM and Under
Brakes are generally not required on trailers that do not exceed 750kg GTM.
Over 750kg and Up to 2,000kg GTM
An efficient service braking system is required.
Over-run brakes may be used on trailers with a GTM up to 2,000kg, and brakes may be fitted to only one axle within this weight range.
Over 2,000kg GTM
Once GTM exceeds 2,000kg:
- Brakes must operate on all wheels.
- An efficient emergency braking or breakaway system is required.
- If the trailer separates from the tow vehicle, the emergency system must immediately apply the trailer brakes.
- The brakes must remain applied for the required period.
It's important to understand that this does not mean Australian law specifically requires an AL-KO iQ7 on every trailer exceeding 2,000kg.
Rather, the complete braking system must meet the applicable requirements.
The iQ7 is one solution designed to provide controlled hydraulic trailer braking together with an integrated breakaway function.
AL-KO iQ7 Integrated Breakaway System
Breakaway protection is especially important on trailers exceeding 2,000kg GTM.
A major feature of the iQ7 is that its breakaway functionality is incorporated into the system.
If the trailer separates from the tow vehicle and electrical supply is disconnected, the system can automatically activate the trailer's service brakes using stored pressure.
Remember that a breakaway system and a parking brake perform different jobs.
The service braking system should not be relied upon as a substitute for the trailer's appropriate parking brake or wheel restraint when the trailer is parked or disconnected.
Is the AL-KO iQ7 Suitable for Boat Trailers?
Yes. Large hydraulic disc-braked boat trailers are one of the applications particularly suited to the iQ7.
Hydraulic disc brakes are widely used on boat trailers because of their effective braking performance and suitability for multi-axle applications.
An electrically controlled hydraulic actuator such as the iQ7 allows these hydraulic brakes to be controlled from the tow vehicle.
The iQ7 may also be suitable for other applications including:
- Caravans
- Camper trailers
- Car trailers
- Machinery trailers
- Tandem-axle trailers
- Multi-axle trailers
The correct system still needs to be selected according to trailer weight, brake configuration and intended use.
Which AL-KO iQ7 Do I Need?
Before purchasing an iQ7, establish exactly which system you are replacing or installing.
AL-KO has offered different iQ7 configurations, including systems designed for approved motion-sensing brake controllers and iQ7 XTREME configurations using the appropriate AL-KO in-car control system.
There are also newer iQ7 Outback configurations intended for demanding environments.
Don't assume different iQ7 versions or control systems are automatically interchangeable.
If you're replacing an existing actuator, identify the exact actuator and controller already fitted before ordering.
Which Brake Controllers Work With the AL-KO iQ7?
Brake-controller compatibility is one of the most important things to check before purchasing an iQ7.
AL-KO maintains compatibility information identifying controllers tested for use with its iQ7 systems.
Don't assume that every electric brake controller will work simply because it is a proportional or motion-sensing controller.
Check the exact make and model against AL-KO's current compatibility information before installation.
This is especially important when upgrading a trailer while retaining an existing tow-vehicle brake controller.
Can I Fit an AL-KO iQ7 to an Existing Trailer?
In many cases, yes.
An iQ7 can be incorporated into suitable existing hydraulic-braked trailers as well as new trailer builds.
However, installing an actuator isn't simply a matter of mounting the unit and connecting a couple of wires.
The complete system needs to be considered.
Depending on your existing equipment, you may require:
- AL-KO iQ7 actuator
- Compatible in-car brake controller
- Suitable hydraulic brake calipers
- Brake rotors
- Hydraulic brake lines
- Correct hydraulic fittings
- Brake fluid
- Appropriate electrical wiring
- Correct breakaway arrangement
- Parking-brake components
- Equipment for bleeding the hydraulic system
Existing brakes should also be inspected before connecting a new actuator.
A new iQ7 cannot compensate for seized calipers, badly worn brake pads, damaged rotors, leaking brake lines or other problems at the wheels.
Does the AL-KO iQ7 Work With Hydraulic Disc Brakes?
Yes.
Hydraulic disc brakes are a major application for the AL-KO iQ7.
The system works approximately like this:
Tow Vehicle Brake Controller → AL-KO iQ7 → Hydraulic Brake Lines → Hydraulic Calipers → Brake Rotors
For boat trailers, the materials used throughout the braking system are particularly important because of exposure to water and potentially corrosive marine environments.
Depending on the application, customers may consider:
- Stainless steel hydraulic brake calipers
- Dacromet-coated hydraulic brake calipers
- Suitable brake rotors
- Corrosion-resistant hydraulic brake lines
- Appropriate hydraulic fittings
The complete brake system should be matched to the trailer and intended operating environment.
Stainless Steel or Dacromet Brake Calipers?
This is a particularly important decision for boat-trailer owners.
Stainless Steel Calipers
Stainless steel hydraulic calipers are popular for marine applications because of their corrosion resistance.
They generally cost more initially but can be an attractive option for trailers regularly exposed to saltwater.
Dacromet Calipers
Dacromet-coated hydraulic calipers provide another option for corrosion protection and are widely used on trailer braking systems.
Which option is best depends on:
- How frequently the trailer enters saltwater
- Maintenance and washing practices
- Budget
- Trailer usage
- Existing brake configuration
Whichever material you choose, regular inspection and maintenance are still essential.
What Else Do I Need With an AL-KO iQ7?
This is one of the most important questions to answer before ordering.
If you're installing a complete braking system rather than replacing an identical actuator, you may also require:
Compatible Brake Controller
The tow vehicle requires the appropriate controller for the particular iQ7 configuration.
Hydraulic Brake Lines
The actuator must be connected to the trailer's hydraulic braking circuit using suitable brake lines and fittings.
Hydraulic Calipers
For a disc-brake system you'll need compatible hydraulic calipers at the wheels.
Brake Rotors
Calipers and rotors must be compatible with each other and the trailer's hub/braking arrangement.
Brake Fluid
Use clean, fresh brake fluid meeting the specification in the current AL-KO instructions for your actuator.
Bleeding Equipment
Once the hydraulic system has been installed or opened for servicing, trapped air must be removed.
The dedicated AL-KO iQ7 Pressure Bleed Gun Kit – P/N 350045 is designed for this purpose.
How Do You Bleed an AL-KO iQ7?
Correct bleeding is essential.
Air trapped in a hydraulic braking system can significantly reduce braking performance even when the other components are functioning correctly.
The general process involves:
- Filling the actuator reservoir with clean brake fluid.
- Connecting the appropriate bleeding equipment.
- Starting with the brake caliper specified by the manufacturer's bleeding procedure.
- Passing fluid through the hydraulic circuit.
- Continuing until air bubbles have been removed.
- Repeating the procedure at the remaining calipers.
- Operating the system as instructed.
- Checking the final fluid level.
- Inspecting the hydraulic system for leaks.
We've created a separate step-by-step AL-KO iQ7 hydraulic bleeding guide covering this procedure in detail.
Follow that guide and the current AL-KO instructions rather than using the actuator itself to bleed the brakes.
Can I Install an AL-KO iQ7 Myself?
Installation involves several safety-critical systems:
- 12V electrical wiring
- Brake-controller wiring
- Hydraulic plumbing
- Breakaway operation
- Trailer brakes
- Final brake testing
AL-KO's current installation instructions should always be followed, along with applicable Australian requirements.
Professional installation is particularly worth considering if you're converting an existing trailer, replacing a different type of actuator or aren't confident that the existing braking and electrical systems are suitable.
Warranty conditions should also be checked before installation.
Testing the iQ7 After Installation
Installation isn't complete until the entire braking system has been tested.
When powered, the iQ7 compressor builds the stored pressure required for operation.
Once the system is ready, brake proportionality should be tested safely using the adjustment procedure specified for the approved brake controller.
The objective is smooth, progressive trailer braking that complements the tow vehicle.
Before normal towing, also inspect for:
- Hydraulic fluid leaks
- Loose fittings
- Damaged brake lines
- Wiring problems
- Correct fluid level
- Correct breakaway operation
- Correct operation at every wheel
AL-KO iQ7 vs Other Electric-Over-Hydraulic Actuators
Customers researching an iQ7 often also encounter electric-over-hydraulic actuators from manufacturers such as Dexter and Hydrastar.
These systems achieve a similar broad objective—using an electrical braking signal from the tow vehicle to operate hydraulic trailer brakes—but their design and specifications differ.
The iQ7's stored compressed-air system is one significant difference.
When comparing actuators, consider more than purchase price.
Check:
- Brake application
- Disc or drum brake compatibility
- Brake-controller compatibility
- Hydraulic pressure requirements
- Breakaway operation
- Electrical requirements
- Installation requirements
- Replacement-parts availability
- Servicing
- Manufacturer support
If you're replacing an existing actuator, don't assume a different model or brand will be a direct plug-and-play replacement.
Maintaining Your AL-KO iQ7 Braking System
Think of the iQ7 as one component of a complete braking system.
Regularly inspect:
Brake Fluid
Check the level and condition.
An unexplained drop in brake-fluid level should be investigated rather than simply topped up repeatedly.
Hydraulic Lines
Look for:
- Corrosion
- Abrasion
- Kinks
- Cracking
- Loose fittings
- Fluid leaks
Calipers and Brake Pads
Inspect calipers for correct operation and pads for wear or damage.
Brake Rotors
Look for excessive wear, corrosion or damage.
Electrical Connections
Check trailer plugs, wiring and earth connections for damage or corrosion.
Marine Applications
Boat trailers exposed to saltwater deserve particularly careful maintenance.
Rinsing, inspection and preventative maintenance can make a significant difference to the life of braking components.
Common AL-KO iQ7 Problems to Check
If the braking system isn't operating correctly, don't immediately assume the actuator has failed.
Weak Trailer Braking
Check for:
- Air in the hydraulic system
- Incorrect controller adjustment
- Low brake-fluid level
- Hydraulic leaks
- Worn pads
- Seized calipers
- Damaged brake components
- Electrical problems
Brakes Are Too Aggressive
Check the brake-controller settings and follow the controller manufacturer's adjustment procedure.
Actuator Doesn't Power Up Correctly
Inspect:
- Trailer plug
- Electrical supply
- Wiring
- Earth connections
- Fuses and circuit protection
Brake Fluid Level Keeps Dropping
Repeated fluid loss indicates a problem that needs investigation.
Inspect the hydraulic system for leaks before towing.
Unusual Compressor Operation
Unusual or excessive compressor operation should be investigated according to the current AL-KO troubleshooting instructions or by a suitably qualified technician.
AL-KO iQ7 Frequently Asked Questions
Is the AL-KO iQ7 suitable for boat trailers?
Yes. Hydraulic disc-braked boat trailers are a major application for the iQ7.
Can I fit an iQ7 to an existing trailer?
In many cases, yes. The existing brakes, brake lines, wiring and tow-vehicle brake controller need to be checked for compatibility and condition.
Does the AL-KO iQ7 have a breakaway system?
Yes. Breakaway functionality is integrated into the iQ7 system.
Do I still need an in-car brake controller?
Yes. The correct control system is required to tell the actuator how much trailer braking to apply.
Will any electric brake controller work?
No. Check your exact controller against AL-KO's current compatibility information.
Can I use stainless steel calipers with an iQ7?
Yes, provided the hydraulic calipers and complete braking configuration are suitable for the trailer and actuator.
Is the iQ7 suitable for trailers over 2,000kg?
It can form part of a braking system for trailers exceeding 2,000kg, but Australian requirements apply to the complete trailer braking system, not simply the actuator.
Does every trailer over 2,000kg legally need an iQ7?
No.
Australian requirements specify braking performance, brakes on all wheels and emergency/breakaway braking requirements above 2,000kg GTM. They don't mandate one particular actuator brand or model.
Can I use the iQ7 itself to bleed the brakes?
No. Use the correct hydraulic bleeding procedure and suitable bleeding equipment.
Should I choose stainless or Dacromet calipers?
Both can be suitable. Stainless steel is particularly attractive for frequent marine use because of its corrosion resistance, while Dacromet provides a lower-cost corrosion-resistant option.
Recommended Products for an AL-KO iQ7 System
If you're building or upgrading a complete system, these are the main products worth considering:
AL-KO iQ7 Brake Actuator
The heart of the braking system.
AL-KO iQ7 Pressure Bleed Gun Kit – P/N 350045
For correctly bleeding the hydraulic system.
AL-KO Stainless Steel Hydraulic Brake Calipers
A strong option for boat trailers and other demanding marine applications.
AL-KO Dacromet Hydraulic Brake Calipers
An alternative corrosion-resistant hydraulic caliper option.
AL-KO iQ7 Complete Brake Kits
Worth considering when building a complete system rather than purchasing individual components.
Stainless Steel Hydraulic Brake Lines
For connecting the actuator to the hydraulic brakes.
Brake Pads & Rotors
Inspect existing components when upgrading the actuator rather than assuming they're still serviceable.
Need Help Choosing the Correct iQ7 Setup?
Choosing an electric-over-hydraulic braking system can become confusing when you're trying to match the actuator, controller, calipers, rotors, brake lines and existing trailer components.
If you're unsure what you need, contact Trailer Spares Online with:
- Trailer type
- GTM and/or ATM
- Number of axles
- Existing brake type
- Current calipers
- Current brake controller
- Existing actuator, if fitted
- Whether the trailer is regularly used in saltwater
With that information, we can help identify the components required for your setup.
Shop the AL-KO iQ7 range or browse our Trailer Brake Parts for hydraulic calipers, brake pads, brake lines and related braking components.
Final Thoughts
The AL-KO iQ7 provides an effective approach to electrically controlled hydraulic trailer braking.
Its use of stored compressed air distinguishes it from many conventional electric-over-hydraulic actuators, while its integrated breakaway functionality makes it particularly relevant to larger Australian trailers.
For boat trailers, caravans and other heavy trailers using hydraulic brakes, the iQ7 can form the heart of a capable braking system.
But the actuator is only one part of that system.
Correct brake-controller compatibility, suitable hydraulic components, proper installation, correct bleeding and ongoing maintenance are all essential.
If you're considering an AL-KO iQ7 and aren't sure which components you need, contact Trailer Spares Online before ordering and we'll help you work through your braking setup.