How to Check and Replace a Trailer Breakaway Cable
The breakaway cable is a vital safety component on braked trailers. If the trailer becomes detached while towing, the cable applies the trailer brakes to help bring it safely to a stop. In this guide, we show you how to check your trailer breakaway cable, when it needs replacing and how it should be fitted correctly. Watch the video below and follow the step by step checks.
Watch: Trailer Breakaway Cable Check and Replacement
What a breakaway cable does
The breakaway cable is designed to activate the trailer brakes if the trailer becomes detached from the tow vehicle. When tension is applied to the cable, it pulls the brake linkage, applying the brakes automatically. This helps slow and stop the trailer, reducing the risk of it running free.
Breakaway cables are a legal requirement on braked trailers and must be fitted and maintained correctly.
Common signs your breakaway cable may need replacing
- Fraying or broken strands in the cable
- Rust or corrosion along the cable or fittings
- Damaged or bent clips
- The cable looks stretched or kinked
- The cable has previously been pulled tight during an incident
Step by step: how to check your trailer breakaway cable
1) Inspect the cable condition
- Check the full length of the cable for fraying, rust or broken wires
- Pay close attention to the ends and clips where wear is most common
2) Check the attachment to the trailer
- The cable should be securely attached to the trailer brake lever or mounting point
- Ensure it moves freely and is not rubbing on sharp edges
3) Check the attachment to the tow vehicle
- The breakaway cable must be attached to a dedicated breakaway point
- Do not loop it around the towball or neck
4) Check cable length
- The cable should be long enough to allow full turning
- It must be short enough to activate the brakes before the trailer fully separates
5) Replace if there is any doubt
- If the cable shows any damage or heavy corrosion, replace it immediately
- Breakaway cables are inexpensive and critical for safety
How to fit a new breakaway cable
Fitting a new breakaway cable is straightforward. Remove the old cable from the brake lever, attach the new cable securely to the same point and ensure it is routed cleanly without snagging. Always test movement before towing.
Once fitted, attach the cable to the correct breakaway point on the tow vehicle and carry out a final visual check.
Is it safe to tow with a damaged breakaway cable
No. A damaged or incorrectly fitted breakaway cable may fail to activate the brakes if the trailer detaches. This can result in a runaway trailer and serious safety risks.
If you are unsure about the condition or routing of your cable, book a safety check before towing.
FAQs
Is a breakaway cable legally required
Yes. All braked trailers must have a breakaway cable fitted and attached correctly to the towing vehicle.
How often should a breakaway cable be replaced
There is no fixed interval, but cables should be inspected regularly and replaced at the first sign of damage or corrosion.
Can I fit a breakaway cable myself
Yes, if you are confident and follow the correct fitting method. If in doubt, a technician can fit one quickly during a service or inspection.
Will a damaged breakaway cable fail a trailer inspection
Yes. Frayed, corroded or incorrectly fitted cables will be flagged during an NTTA style safety check.
Need your breakaway cable checked or replaced
Our technicians can inspect your trailer, replace worn breakaway cables and ensure everything is set up safely and correctly. Book a trailer inspection or service at our NTTA approved workshop in Hatfield.
Book trailer servicing Contact GT Towing