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# Caravan Brake Controllers: The Complete Guide
You are rolling down a long descent, the van pushing harder on the back of the ute with every bend, and the tow vehicle brakes doing more work than they should. That is the moment you remember why electric brakes and a good controller are not optional on a touring rig — they are the difference between stopping with confidence and stopping because you are out of options.
Spring is caravan season in Australia: school holidays are coming, the weather is clearing, and thousands of rigs are coming out of storage. Before you hitch up, it pays to understand how the outfit's brakes work — and whether the controller in your tow vehicle is the right one, wired properly and tuned for your van.
The Short Answer
If your caravan has electric brakes, you need a controller in the tow vehicle — which in most Australian states means any van over 750 kg ATM. A proportional unit like the Redarc Tow-Pro or Tekonsha P3 suits a touring rig because it brakes in step with you. Set the gain with a manual override test, then fine-tune with the van loaded the way you actually travel.
Do You Actually Need a Brake Controller?
Electric caravan brakes are magnets pressing on drums, activated by a controller in the tow vehicle. Without one, the van rolls free and every stopping task falls on the tow vehicle — manageable on a flat straight, a different story on a descent or in traffic.
The 750 kg Rule
Australian trailer regulations vary by state, but the commonly applied rule is that trailers over 750 kg ATM need working brakes, and electric brakes need a controller. Some states set the threshold higher, so check your state's road rules. The practical answer is simple: if your van has electric brakes, fit and use a controller. It is not there to satisfy paperwork; it is there to keep the outfit straight when things go wrong.
Breakaway Systems
For heavier vans, most states also require a breakaway system — a battery and switch on the van that applies the brakes if the van separates from the tow vehicle. Even where it is not mandatory, it is cheap insurance. The breakaway battery needs a proper charge feed and a check before every trip; a flat breakaway battery is a safety system that does nothing.
Proportional vs Timed: The Two Controller Families
Brake controllers come in two families, and the difference matters more than the brand on the box.
Proportional Controllers
Proportional units sense how hard the tow vehicle is decelerating and match the van's braking — coast to a stop and the van brakes gently, brake hard and it brakes hard. The Redarc Tow-Pro is the best-known example in Australia because it suits dual-cab utes with factory tow packs; the Tekonsha P3 has a long caravan-world reputation. Proportional units also handle gravel better.
Timed Controllers
Timed controllers apply the van's brakes for a set time after you touch the pedal, ramping up as the timer runs. They are cheaper and simpler, and fine on sealed roads in steady conditions. Their weakness: brake softly and the van still gets a fixed amount of braking, and on loose surfaces a timed pulse can lock the van's wheels when the tow vehicle is not stopping hard.
Quick comparison
| Feature | Proportional | Timed |
|---|---|---|
| Braking feel | Matches your braking | Fixed ramp on a timer |
| Sealed-road touring | Excellent | Acceptable |
| Off-road / gravel | Better | Can lock wheels |
| Typical price | Higher | Lower |
| Best for | Touring rigs, varying loads | Budget setups, steady highway towing |
Wiring It In: The 7-Pin Basics
Wiring the controller is not hard, but it is the step most people rush. The job has three parts: power to the controller, the signal that tells it when you are braking, and the brake feed down the trailer plug.
What Pin 5 Actually Does
In a standard Australian 7-pin plug, the electric brake circuit runs on pin 5, carrying a variable voltage from the controller to the magnets in the drums. If the tow vehicle and van are wired to different standards, or the plug is corroded, the brakes will be weak or intermittent — so a clean, dry plug is part of the braking system.
Mounting and the 12V Feed
Mount the controller under the dash on the driver's side, where you can reach it and see the readout. It needs a solid 12V supply, a clean earth, and a signal from the brake light circuit or an inertia sensor. On a used tow vehicle, check the trailer wiring is rated for the brake circuit — a poor earth causes more "brakes not working" complaints than any other fault.
Setting the Gain on the Road
The gain is how much braking the controller applies — a setting you tune, not guess.
The Manual Override Test
On a quiet road, drive at 25–30 km/h and use the manual override. The van should brake noticeably and the rig stay straight. Barely any reaction means the gain is too low or the brakes need adjusting; locked wheels or a pulling rig means it is too high. Adjust in small steps.
Tuning for Load and Heat
Set the gain with the van loaded as you actually travel and re-check after any big load change. On hot days, overheated magnets lose efficiency, so a controller that felt perfect in the morning can go soft by mid-afternoon. Worn magnets or glazed drums mean no amount of tuning will fix it — include a brake inspection in your pre-trip checks.
Real-World Tips from the Track
- Test the breakaway battery and switch before every trip — it is a two-minute job and the only thing that stops a runaway van
- Clean the 7-pin plug at every fuel stop on a long run; corrosion on pin 5 shows up as weak brakes
- Set the gain on a flat quiet road, then verify on the first real descent
- If the van pulls one way under electric braking, suspect a seized magnet or worn drum on that side
- After winter storage, have the magnets and drums inspected before the first long spring trip
Wiring It Together with Outcamp
While you are improving the van's 12V setup, give the trailer feed the same attention you give the fridge: a proper Anderson plug feed for the breakaway battery and a voltmeter to check it before you leave. Outcamp's 12V accessories range covers Anderson plugs, cables and monitoring gear built for touring conditions.
Over to You
A brake controller is one of those upgrades you fit once, set up properly and never think about again — until the day it earns its keep on a long descent. If you have a setup tip or a lesson from your first season towing, drop it in the comments.
FAQ
Do all caravans need a brake controller?
Only vans with electric brakes need one, but in most Australian states any caravan over 750 kg ATM needs working brakes anyway. If your van has electric brakes, fit a controller and use it.
What is the difference between proportional and timed controllers?
Proportional controllers sense your deceleration and match the van's braking to it, which feels smoother and works better on loose surfaces. Timed controllers apply a fixed amount of braking for a set time; they are cheaper but less refined.
How do I know if my brake gain is set correctly?
Use the manual override at 25–30 km/h on a quiet road. The van should brake noticeably without locking wheels or pulling off-line. Re-check whenever the load changes, and have the magnets and drums inspected before spring touring.
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