Beatrice Lang
Electric trailer brakes are permitted in the UK under certain conditions. The Road Vehicles (Construction and Use) Regulations 1986, as amended, and the Road Vehicles Lighting Regulations 1989, as amended, outline the requirements for trailers used on UK roads. These regulations specify that all trailers with a maximum laden weight of 3500 kg or less are permitted to have electric brakes, regardless of their country of origin. Additionally, the transmission method for applying the brakes can be mechanical, hydraulic, pneumatic, or electric. While electric trailer brakes are legal, there are specific requirements for their use, such as the need for a parking brake and compliance with brake response time mandates.
| Characteristics | Values |
|---|---|
| Are electric trailer brakes legal in the UK? | Yes, electric trailer brakes are legal in the UK. |
| Requirements | All trailers with a maximum laden weight of 3500 kg or less are permitted to have electric brakes. |
| Regulations | The transmission method by which the signal is used to apply the brakes may be mechanical, hydraulic, pneumatic, or electric. |
| European Regulations | The time delay between the driver applying the brakes and the braking force reaching the prescribed brake performance must not exceed 0.6 seconds. |
| American Caravan and Trailer Regulations | May not meet the requirement for brake response time. Do not always have a parking brake or brakes on all wheels. |
| Braked Trailer Requirements | Must be fitted with a parking brake that operates on at least two road wheels on the same axle. Must be capable of being maintained in operation by direct mechanical action without the use of hydraulic, electric, or pneumatic systems. |
| Trailer Weight Requirements | A working brake system is required if the trailer weighs over 750 kg when loaded. |
| Types of Electric Brakes | Electric brakes can be controlled by a brake controller, which can be mounted under the tow vehicle's dash or integrated into the vehicle. |
| Battery Usage | It is possible to charge the trailer battery and use the brakes simultaneously. |
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What You'll Learn
- Electric trailer brakes are legal in the UK for trailers with a maximum laden weight of 3500kg or less
- Braked trailers manufactured after October 1982 must comply with EC Directives
- European requirements mandate that a trailer must be fitted with a parking brake
- The towing vehicle's braking system must directly operate the trailer's brakes
- The brake controller automatically applies the brakes on electric brakes
Electric trailer brakes are legal in the UK for trailers with a maximum laden weight of 3500kg or less
Electric trailer brakes are legal in the UK for trailers with a maximum laden weight of 3500 kg or less. This is outlined in the Road Vehicles (Construction and Use) Regulations 1986, as amended (C&U), and the Road Vehicles Lighting Regulations 1989, as amended (RVLR). These regulations specify that the transmission method by which the signal is used to apply the brakes may be mechanical, hydraulic, pneumatic, or electric.
It is worth noting that while electric trailer brakes are legal in the UK for lighter trailers, there are specific requirements for brake systems outlined by the European regulations. For example, European regulations mandate that the time delay between the driver applying the brakes and the braking force reaching the prescribed level must not exceed 0.6 seconds. Additionally, European regulations require that a caravan and trailer must be fitted with a parking brake capable of holding the vehicle stationary on an 18% gradient in both upward and downward directions.
American caravans and trailers with electric brakes often have an electrical device mounted in the towing vehicle, which senses deceleration and transmits a signal to the caravan/trailer braking system. This type of device must be mounted on the caravan/trailer according to European regulations. The electrical energy for the braking system must be supplied by the towing vehicle. If there is a battery on the trailer, it must be disconnected during the application of the service braking system.
In terms of coupling requirements, braked trailers manufactured before October 1982 may be fitted with a spring-damped coupling, while those manufactured after October 1982 must have a coupling that incorporates a hydraulic damper. Additionally, trailers manufactured after April 1989 must be fitted with a hydraulically damped coupling and auto-reverse brakes to comply with EEC directives. The size of the ball coupling on braked and unbraked trailers should be 50mm to meet ISO and BSI standards.
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Braked trailers manufactured after October 1982 must comply with EC Directives
In the UK, braked trailers manufactured after October 1982 must comply with EC Directives. These directives specify that all wheels of the trailer must be braked. Additionally, the efficiency of the handbrake must comply with EEC Directive 71/320/EEC, meaning it must be capable of holding a stationary trailer on a gradient of at least 16% (1 in 6.25).
To ensure safety, an emergency breakaway cable must be fitted to the parking brake linkage. In the unfortunate event of the trailer becoming detached from the towing vehicle, this cable will automatically apply the parking brake before snapping. This safety mechanism is crucial and not utilising the breakaway cable is considered a separate offence.
Furthermore, the EC Directives require that the trailer's braking system be capable of automatic activation if the coupling separates while the trailer is in motion. This regulation ensures that the trailer can come to a stop even if it is no longer physically connected to the towing vehicle.
It is important to note that the transmission method for applying the brakes may vary. The EC Directives permit mechanical, hydraulic, pneumatic, and electric transmission methods. However, the handbrake must be capable of being maintained in operation by direct mechanical action without relying on hydraulic, electric, or pneumatic systems.
In summary, braked trailers manufactured after October 1982 in the UK must adhere to stringent EC Directives that prioritise safety and performance. These regulations ensure that trailers have effective braking systems, including handbrakes that meet specific efficiency standards and safety features like emergency breakaway cables.
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European requirements mandate that a trailer must be fitted with a parking brake
In the UK, the use of electric trailer brakes is legal. The Road Vehicles (Construction and Use) Regulations 1986, as amended (C&U), and the Road Vehicles Lighting Regulations 1989, as amended (RVLR), outline the requirements for trailers used on UK roads. These regulations specify that trailers with a maximum laden weight of 3500 kg or less are permitted to have electric brakes, regardless of their country of origin.
The European regulations also stipulate that the working parts of the parking brake must be held in the locked position by a purely mechanical device. This requirement ensures that the parking brake cannot be accidentally released and that it can be relied upon to keep the trailer stationary when required. Additionally, European regulations prohibit the use of trailers with brakes on only one axle, mandating that each individual wheel must have a functional braking system.
To comply with European directives, the parking brake must also include an emergency breakaway cable. This cable is attached to the parking brake linkage, with the other end fixed to the towing vehicle. In the event of the trailer becoming detached from the towing vehicle, the breakaway cable automatically applies the parking brake, preventing uncontrolled movement of the trailer and minimising potential hazards.
Furthermore, European requirements dictate specific standards for the ball coupling size on braked and unbraked trailers. The ball coupling must adhere to ISO and BSI standards, with a size of 50 mm. This standardisation ensures compatibility and safety across different trailer and towing vehicle combinations.
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The towing vehicle's braking system must directly operate the trailer's brakes
Electric trailer brakes are legal in the UK. The Road Vehicles (Construction and Use) Regulations 1986 state that all trailers with a maximum laden weight of 3500kg or less are permitted to have electric brakes. This applies to trailers from America or elsewhere.
It is important to note that the electrical energy required for the electrical braking system must be supplied to the trailer by the towing vehicle. Additionally, if there is a battery on the trailer that is fed by the power supply unit of the towing vehicle, the power from the battery must be disconnected during the application of the service braking system.
In Europe, regulations also require that each wheel on a trailer must have a brake. This differs from American caravans and trailers, which often only have brakes on one axle. Additionally, European requirements mandate that a caravan and trailer must be fitted with a parking brake capable of holding the vehicle stationary on an 18% up or down gradient. The working parts of the parking brake must be held in the locked position by a purely mechanical device.
To summarise, while electric trailer brakes are legal in the UK, it is essential to ensure that the towing vehicle's braking system directly operates the trailer's brakes and that all other relevant regulations, such as those regarding parking brakes and wheel brakes, are complied with.
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The brake controller automatically applies the brakes on electric brakes
Electric trailer brakes are legal in the UK. All trailers with a maximum laden weight of 3500 kg or less are permitted to have electric brakes.
Electric trailer brakes require an electric connection to the tow vehicle to work. An electrical connection on the trailer plugs into the connector on the vehicle. When the driver steps on the brakes, it sends a current to the brake control in the vehicle, which then sends a current back to the trailer to activate the brakes.
For example, when going downhill, using lower gears to slow down decreases brake wear. Inertia-based brake controllers sense that the vehicle is slowing down and adjust the trailer braking power accordingly. This type of controller is also known as a proportional brake controller, which can sense how quickly the tow vehicle is stopping and apply the same amount of braking power to the trailer.
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Frequently asked questions
Yes, electric trailer brakes are legal in the UK. The Road Vehicles (Construction and Use) Regulations 1986 states that all trailers with a maximum laden weight of 3500kg or less are permitted to have electric brakes.
The electrical energy required for the electrical braking system must be supplied to the trailer by the towing vehicle. If there is a battery on the trailer supplied by the towing vehicle, the power from the battery must be disconnected during braking. Additionally, the braking system must comply with EC Directives.
Braked trailers must be fitted with a parking brake that operates on at least two wheels on the same axle. The parking brake must be capable of holding the vehicle stationary on a gradient of at least 16% (1 in 6.25). An emergency breakaway cable must also be fitted to the parking brake linkage, which will automatically apply the brakes if the trailer detaches from the towing vehicle.
Unbraked trailers manufactured after January 1, 1997, must be fitted with a secondary coupling that provides residual steering and prevents the ball coupling from hitting the ground if the trailer detaches from the towing vehicle.
If you passed your driving test before January 1, 1997, you are typically allowed to drive a vehicle and trailer combination with a maximum authorized mass (MAM) of up to 8,250 kg. You can check your driving license for more information.
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