Otis Singleton
Electric trailer brakes are an essential component of road safety, especially when towing loads above 2000 kg. To determine the size of electric trailer brakes, it is necessary to measure the depth and width of the hub drum on the axle. The most common size is 2-1/4 inches wide, but sizes can vary depending on the specific trailer and its weight rating. Electric brake controllers are crucial in managing the electrical current to the trailer brakes, ensuring compliance with road rules and safe braking functionality.
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What You'll Learn
Electric trailer brakes and towing capacity
Electric trailer brakes are an essential component of trailer safety. They are activated by a positive voltage applied to the brake light circuit, triggering a response that matches the driver's braking action. The amperage required for these brakes ranges from 3.2 amps to 16 amps, depending on the size of the brake magnet and the axle configuration. To ensure legal compliance and safety, electric trailer brakes must be accompanied by a brake controller that regulates the brake force. This controller can be time-delayed or proportional. The former provides a preset amount of braking power, while the latter adjusts the brakes on the trailer in proportion to the driver's braking force.
When considering towing capacity, it is crucial to determine the weight of the trailer and the gear being hauled. While electric trailer brakes can provide some flexibility in towing capacity, it is unsafe to exceed the tow vehicle's rated capacity. For example, a Jeep Wrangler with a 2000-pound capacity should not tow a load exceeding this limit, even with properly functioning electric brakes. However, electric brakes can provide a safety margin, allowing for a slight excess in weight without compromising safety.
It is important to note that some states require both axles of a trailer to have electric brakes. Additionally, a 7-pin plug is necessary for electric brakes to ensure proper power and brake electronics for safe road use. Before embarking on a trip with a trailer, it is recommended to weigh the trailer and its contents at a public scale to ensure compliance with weight limits and avoid safety hazards.
When installing electric trailer brakes, it is essential to select a suitable brake controller. The Prodigy model is recommended for its compatibility with various trailers and vehicles. Elecbrakes is another innovative option, powered entirely through standard trailer wiring without requiring modifications to the tow vehicle. Elecbrakes uses microprocessors and accelerometers to measure and adjust brake response, ensuring a safe and proportional braking experience.
In conclusion, electric trailer brakes play a crucial role in towing safety. They provide flexibility in towing capacity, allowing for a slight excess in weight when properly functioning. However, it is essential to prioritize safety by adhering to weight limits, using the appropriate brake controller, and ensuring proper installation and maintenance of the electric trailer brakes.
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Electric trailer brake controller
An electric brake controller is a crucial component when towing loads beyond a basic box trailer, especially when the load's Gross Trailer Mass (GTM) exceeds 2,000 kg. In such cases, the use of electric brakes and a compliant electric brake controller are mandatory. Electric brake controllers, such as the Elecbrakes and REDARC Tow-Pro range, offer several advantages and ensure safe and smooth braking performance.
An electric brake controller manages the electrical current (in amps) flowing from the car's battery to the trailer's brake magnets. This controls the power and timing of brake activation. These controllers come in either 12-volt or 24-volt varieties, and it is essential to match the controller's voltage to the power source of the towing vehicle. Most conventional controllers are compatible with either 12-volt or 24-volt systems but not both. The REDARC Tow-Pro Elite is an exception, as it is compatible with both voltage systems.
The REDARC Tow-Pro range offers innovative and award-winning electric trailer brake controllers. These controllers provide smooth and safe braking across various trailer types, including enclosed, flatbed, fifth wheel, and marine trailers. The Tow-Pro Elite stands out with its two braking modes: 'Everyday Mode' (proportional braking) and 'Manual Off-Road Mode'. Proportional controls automatically adjust the trailer brakes' power based on the tow vehicle's deceleration, resulting in a smooth braking response.
The Elecbrakes controller is also noteworthy for its compatibility with standard trailer wiring. It can be powered entirely through the standard trailer wiring without modifying the tow vehicle. Additionally, Elecbrakes recommends using at least a 14-gauge wire thickness for trailer circuits and electric brake wiring. This wire thickness provides an allowable ampacity that safely covers the power draw of electric brakes.
In summary, when considering electric trailer brake controllers, it is essential to match the controller's voltage to the towing vehicle's power source. The REDARC Tow-Pro range offers innovative features, smooth braking, and compatibility with various trailer types. Meanwhile, the Elecbrakes controller stands out for its compatibility with standard trailer wiring and its recommendation for wire thickness contributes to safe electrical connections. These controllers ensure compliance with regulations and enhance safety during towing and braking.
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Electric brake wire size
The wire size for electric trailer brakes is dependent on the size and type of trailer, the number of brakes, and the distance from the brake controller to the electric brakes.
For a small trailer with a single axle of brakes, a 12-gauge wire is sufficient. However, for longer trailers with multiple axles, it is recommended to use a 10-gauge wire or larger. This is because thicker wires have better amperage handling capabilities over long distances, reducing resistance in the circuit.
The National Electrical Code rates 14-gauge wire as providing an allowable ampacity for 20 amps of current at 30 degrees ambient temperature, which is adequate for some electric brake systems. However, larger trailers with more brakes will require thicker wires to handle the increased amperage.
Some sources recommend using 18-gauge wire for a 5-wire system, while others suggest 14 or 12-gauge wire as a minimum for trailer brakes. It is worth noting that using a larger wire gauge can make connections easier and provide a larger diameter to carry current, even if the wire becomes damaged or corroded.
When using a 7-way connector, the suggested minimum wire gauge for the white (ground) wire, red or black (power) wire, and blue (brake power) wire is 12-gauge. Meanwhile, the minimum wire gauge for the remaining wires (green, yellow, brown, and purple) is 16-gauge.
It is important to consult the specific requirements and recommendations for your trailer's make and model to determine the appropriate wire size for your electric trailer brakes.
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Electric trailer brake assembly size
Electric trailer brakes are an essential component of any towing setup, especially when dealing with loads above a certain weight threshold. The size of the electric trailer brake assembly is a critical factor in ensuring safe and effective braking performance. Here's a comprehensive guide to help you understand electric trailer brake assembly sizes and make informed decisions about your trailer's braking system:
Factors Affecting Electric Trailer Brake Assembly Size:
The size of the electric trailer brake assembly can vary depending on several factors, including the type of trailer, the weight of the load, and the dimensions of the axle and wheels. It's important to select the appropriate brake assembly size to ensure optimal braking performance and comply with legal requirements.
Common Electric Trailer Brake Assembly Sizes:
The most common sizes for electric trailer brake assemblies are 10" x 2.25" and 7" x 1.25". These brake assemblies are designed to fit specific axle ratings and wheel sizes. For example, the 10" x 2.25" brake assembly is typically rated for axles up to 3,500 lbs, while the 7" x 1.25" brake assembly is designed for axles up to 2,200 lbs.
Measuring for the Correct Size:
To determine the appropriate electric trailer brake assembly size for your trailer, it's crucial to take accurate measurements. You'll need to measure the diameter of the mounted brake shoe, the width of the lining, and the distance between the mounting holes. Additionally, identifying the manufacturer of your current brake assembly can help in selecting the correct replacement parts. It is generally recommended to replace both brake assemblies simultaneously to ensure consistent braking performance.
Electric Brake Controller:
An electric brake controller is another essential component of the trailer braking system. It regulates the electrical current supplied to the trailer brakes from the towing vehicle's battery, controlling the power and timing of brake activation. Electric brake controllers come in either 12-volt or 24-volt varieties, and it's important to match the voltage of the controller with the power source of the towing vehicle.
Wiring Considerations:
When installing electric trailer brakes, it's crucial to use the appropriate wiring. The National Electrical Code recommends using a 14-gauge wire, which provides an allowable ampacity for 20 amps of current. This ensures safe and adequate power delivery to the trailer brakes. Additionally, consider using connectors, zip ties, wire clips, electrical tape, and ground screws for a secure and professional installation.
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Electric drum brake size
Electric drum brakes come in various sizes, and selecting the right size for your trailer is crucial to ensure sufficient stopping power. To determine the correct size, you need to measure the depth and width of the hub drum on the axle. The most common width for electric drum brakes is 2-1/4 inches, but they can also be found in other sizes, such as 2-1/2 inches or 7 x 1-1/4 inches.
When upgrading from surge brakes to electric brakes, you must first remove the old hydraulic components, including the surge coupler, actuator, and brake assemblies. If you have 10-inch diameter hub and drums, you may need to replace them. The size of the hub assembly required depends on the bearings in the old assembly. For example, if your old assembly used L44649 inner bearings, you would need a hub like #8-258-5UC1.
The weight capacity of your trailer is another important factor in selecting the appropriate electric drum brake size. Electric brakes are mandatory for towing loads above a certain weight, and the brake size must match the axle weight rating. Typically, a trailer tire in size ST175/80R13 has a weight rating of 1100 to 1600 lbs per tire, resulting in an axle rating of 2000 to 3500 lbs. Axles rated for 2000 to 2200 lbs usually require 7 x 1-1/4-inch brakes, such as #AKEBRK-2.
Additionally, it is essential to consider the electrical specifications of your trailer setup. Electric brake controllers manage the electrical current supplied to the trailer brakes from the car's battery, and they come in either 12-volt or 24-volt varieties, which must match the towing vehicle's power source. While there is no standard amp requirement for trailer brakes, it is recommended to use at least a 14-gauge wire thickness to ensure sufficient power delivery without overheating.
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Frequently asked questions
To determine the size of your electric trailer brakes, you need to measure the depth and width of the hub drum on the axle. The most common size is 2-1/4 inches wide.
The size of your electric trailer brakes is determined by the axle weight rating and the wheel size. The axle weight rating ensures that your brakes have sufficient stopping power relative to the trailer's weight.
To measure the size of your electric trailer brakes, you need to measure the diameter of the mounted brake shoe, the width of the lining, and the distance between the mounting holes on the centre.
Yes, electric trailer brakes come in different varieties, such as electric drum brakes and electric disc brakes. The specific type you need depends on factors like the trailer's weight, axle rating, and wheel size.
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