Breakaway brakes are a legal requirement for heavier vans, but do you understand the setup? In this guide, we break it down for you and look at what can go wrong.
If ever there was a comprehensive fail-safe in Australian safety legislation, it is for caravans weighing more than 2000kg GTM. Not only must they be fitted with a rated safety chain (two chains for vans weighing more than 2500kg GTM) but also an emergency brake system, known as breakaway brakes.
A breakaway brake system is designed to automatically apply the caravan’s brakes in the case where the van has detached from the tow vehicle when driving. What it is meant to achieve is to bring the errant van to a stop before it crashes into anything. Not only that, the breakaway system has to ensure the caravan stays stopped. Under the Australian Design Rule 38/05 – Trailer Brake Systems, once activated, the breakaway brakes must be able to remain on for a minimum period of 15 minutes.
What’s the point of safety chains, then, you ask? If the cable that activates the breakaway brakes is looped in a way that it is short enough to activate the brakes while the chains are attached (but the coupling has come off the towball), then at least you’re likely to have better control of the caravan as you come to a stop. Better that the van is independently slowing rather than moving around on the safety chain(s).
If either the safety chains or shackles break, or the towbar unit disengages completely from the tow vehicle, then with a correctly operating breakaway brake system, at least the caravan will come to a stop as soon as possible (on its wheels at least).
In Europe, there is no requirement for safety chains. Instead, the Europeans rely on a coupling that is difficult to not positively engage — so it’s unlikely that the coupling would come off the towball— and if it did, the breakaway brake system is very simple — a cable linked from the tow vehicle to the caravan handbrake.
Meanwhile, the typical Aussie breakaway brake system has a switch fitted to the A-frame that is fed 12-volt power from either the house battery (or its own 7amp, 12V battery via a control unit such as the Breaksafe unit) and linked to the caravan’s electric brake circuit.
The switch is very simple: it contains two spring-loaded contacts held apart by a removable pin attached to a steel cable attached to the tow vehicle. If the vehicle and van were to separate, the cable pulls the pin out of the switch body, the contacts in the switch close the circuit and power is fed from the battery to the brakes. Another circuit from the switch runs to activate the caravan’s brake lights.
Breakaway brake regulations are uniform across states and territories — although that wasn’t always the case.
Until amendments that came into effect in 2017 under the Road Transport (Vehicle Registration) Regulation 2017, NSW were unique in that you had to have a breakaway battery monitor to warn the driver of low battery condition — and that the breakaway system be powered by its own battery — but that is no longer the case.
According to a spokesperson from Transport for NSW, “There is no longer a requirement under NSW law for a brakeaway [sic] system to be powered by its own battery or for a dedicated brake battery monitoring device to be fitted. The use of a monitoring device is still highly recommended by Transport for NSW to improve safety.”
There are several issues that can interfere with the correct operation of a breakaway brake system.
The first is that if it’s a system with a control unit and integral battery, the battery must be either charged with a battery charger or charged via the tow vehicle, or it will run flat and not operate the trailer brakes. Make sure that the pin in the 12- or seven-pin trailer plug that supplies charging current from the vehicle to the battery hasn’t closed up, or your breakaway battery won’t be fully charged.
The other issue is that the battery may no longer hold an adequate charge due to deterioration of the battery itself. While the breakaway control unit is normally fitted with a battery charge check button, ideally, you would use an independent load tester to ascertain if the battery is still operating correctly.
If you’re running the breakaway system on house batteries, if you pull out the pin (for example, when unhitching the tow vehicle at camp) and don’t replace it, the house battery will deplete as it is powering the brake magnets. Leave it for long enough, and you’ll end up with not only a flat house battery at camp but also inoperative breakaway brakes next time you hitch up (until the tow vehicle sufficiently charges the battery).
While many caravanners loop the steel breakaway cable through a shackle or towbar eyelet, that will not help at all if the towbar assembly pulls away from the vehicle. It’s a rare occurrence, but the breakaway brakes can’t activate if it were to happen.
Securing the cable to either a dedicated fitting on the vehicle body or a secure stainless-steel loop riveted to the bumper are the only ways to ensure that the breakaway system will operate as it is supposed to if the towbar comes away. As mentioned earlier, loop it in such a way that you don’t have so much excess cable that the breakaway system won’t activate if the coupling were to detach from the towball and rest on the safety chains.
Lastly, if your caravan brakes are in poor condition and are not slowing down the van very well when hitched up, you can bet they will do little in an emergency situation, such as when the breakaway brakes are activated. Always ensure that your brakes are properly adjusted, with plenty of friction material left on the brake shoes and magnets and wiring in good service condition.
While breakaway brakes are something you don’t often think about, it pays to ensure that the system is functioning properly just in case the worst should happen.
I recently had a setuation where my caravan became unhitched and it simply broke the end off the breakaway switch and did not engage the caravan brakes,
I would suggest if the breakaway is subject to sunlight and unit should be replaced regularly due to the plastic deteriorating
Yes hi i had the misfortume of see ing a bad axedent where a caravn came unhitched and stopped in the middle of the road and it made a road block and 3 cars crashed into it and it was a mess . brake away brakes are unsafe and i think the 1.5 rule that use to be was muvh safer . brake aways are just something else to go wrong . Now can i tell you about electic brakes and boat trailers . i drove a truck for many years and air brakes are the way to go . when the air line brakes evey thing stops untill air is aplied . Whats this reg , at least 15 min holding . To bad if you are on the Karanda range with a 3000 kg tug and a 3500 kg caravan and just a car licence . i think safty first and that only come with proper training . It is a huge resposability to tow heavy trailers .
hi i found your your advise is not quite right . the break away brake is only required if the atm is ovger 2000 kg and that is the weight of the wheels on the road and it is not the not the gtm . gtm can be 2000 plus 350 tbw . so all up is 2350 kg for brake away brake . if my caravan is weighed on the road by police i am ok if my axels are under 2000 kg so get it right mate , read the regs before you say u know it all so if my landcruiser is 3000 kg with tow ball weight on the i have 2350 kg caravn and that makes 5300 kg so the police will want to make sure that i have a light truck licence to be over 5 ton . that is the main thing to worry about .h ow many caravan are over 5 ton . have a mis hap and ther is your insurace problem . any way mate that hoe i see the reg so what do you think . cya ron
Yes . hi ithink some vicles are way to small to tow big caravans . I drive a truck and i can see a lot of the a wobble boxes and then they waye at you when they go past . i would rather the the driver kept two hands on the wheel . How come i have to have a truck licenes to drive any thin over 4.5 ton . I mean some of the wobble boxes are huge . heavy off road chassis . big heavy wheels . and all the gear inside and spare water and fuel and tools . i am so glad when the are past me . oh i am sure ther brake aways are working .
hi yes. i think every one who tows a caravan should go to caravan shool to learn about the weights and how to handle a big caravn. and have a, c stamp on their licence . you know it shocking to think that some one who has driven around the city all there lives, then retire and buy a rig to go around the big paddock . get some experiance , get some help to be safe . caravans have gone to far , they are homes now . huge , heavey , and the small tow cars , little 4×4 towing 3,5 tone plus the kitchen sink . some are so green they tow in 5 gear and wonder why the gear box blows . tiny little helco gut gears , did you know some over drive gears are plastic? to make the little 4×4 quiet on the road so that you will buy one so your trip will be wissper quiet . Get a land cruiser 4.2 turbo , mine has done 650000 klm hdj80 . If you are going to tow a big van then get a big tug . remember the 1.5 rule from the old days . whith that rule you can stop ok and wally wobble wont get you . How could the rules be changed like this . oh and dont forget to keep a look out for your vans u bolts , if they come loose the axel will be insde your van . Yes they do come loose .