
Converting air brakes to electric brakes is a feasible task, but it requires careful planning and execution. The process typically involves removing the existing air brake system and installing electric brakes from scratch. This includes considerations such as ensuring compatibility with the trailer's axle, weight capacity, and brake mounting flange bolt pattern. Additionally, electrical components such as solenoids, check valves, filters, and dryers play a crucial role in the conversion process. While it is possible to perform this conversion, individuals should carefully weigh the costs and benefits, as it may be more practical to sell the existing trailer and purchase one with electric brakes already installed.
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What You'll Learn

Electric brakes are more resistant to fade and corrosion
Electric brakes are less susceptible to these issues. Firstly, electric brakes do not rely on fluid, so the risk of fluid boiling is eliminated. Secondly, electric brakes are more responsive to the driver's input, and so the risk of the brake pedal "travelling all the way to the floor" is reduced. Thirdly, electric brakes are less affected by changes in kinetic energy, which rises with the square of velocity, and so are less likely to experience the sudden increase in heat that can cause brake fade. Finally, electric brakes are less likely to be affected by positive feedback or "self-servo", which is when some of the braking force feeds back into the brake mechanism to further self-apply the brake. This can reduce the input force needed to apply the brake but can also worsen fade.
In addition to being more resistant to brake fade, electric brakes are also less prone to corrosion. This is because they do not rely on fluid, which can absorb water and contaminants, leading to corrosion over time.
Converting air brakes to electric brakes can be a complex process, and it is important to consider the specific technical specifications of the vehicle. However, it is possible to retain air brakes while adding electric brakes by installing a 3-way switch. This allows the vehicle to run both types of brakes, providing more flexibility and potentially making the conversion process simpler.
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You'll need a hub and drum that matches your trailer spindle
When converting air brakes to electric brakes, you'll need a hub and drum that matches your trailer spindle. This is essential to ensure a smooth and safe towing experience. To determine the correct hub and drum, you'll need to identify the trailer spindle specifications, such as the spindle type and diameter.
The BTR and BT8 denotations refer to the spindle type, with BTR spindles using a 1.063" diameter bearing and BT8 spindles using a 0.99" diameter bearing. You can identify the spindle type by examining the bearing part numbers. It's important to note that trailer spindle part numbers are typically not stamped on the spindle itself but can be found on the hub.
Once you've identified the spindle type and diameter, you can select the appropriate hub and drum assembly. For example, if you have a BTR spindle, you would choose a hub with the BTR specification. It's crucial to ensure compatibility between the hub and drum assembly and your trailer spindle to guarantee a secure fit and optimal performance.
In addition to the hub and drum, you'll also need left and right brake assemblies. The type of axle and its weight capacity will impact the specific brake assemblies you require. Make sure to verify that the brake mounting flange bolt pattern matches your trailer's specifications.
Moreover, you'll need to consider the wiring and connectors necessary for the electric brake system. It is recommended to use 10-gauge wire and attach the wires from the brake magnet to the white wire for ground and the black wire for power from the 7-Way connector. Finally, a brake controller and a wiring kit will be required to complete the installation.
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You'll need a pair of solenoids to control the air pressure
When converting air brakes to electric brakes, solenoids are crucial for controlling the air pressure. Solenoid valves are electronically controlled valves that regulate the flow of air to the brake chambers. They are activated by electrical signals, which are converted into pneumatic functions. This means that when the brake pedal is pressed, a signal is sent to the solenoid valve, causing it to open and allow compressed air to flow into the brakes.
For this setup, you'll need a pair of solenoids with distinct functionalities. One solenoid will be of the type that opens when power is applied and shuts when the power is cut off. This solenoid, labelled as solenoid A, will control the air supply to the trailer brakes. When the brake pedal is depressed, solenoid A opens, allowing air to reach the trailer brakes.
The second solenoid, labelled as solenoid B, will exhibit opposite behaviour. It will be of the type that closes when power is applied and opens when the power is removed. Solenoid B acts as a vent, ensuring that when the brake pedal is released, the air pressure behind solenoid A is released through a check valve. This check valve is essential to prevent contaminants like water, mud, or debris from entering the brake system while allowing air pressure to escape.
By using these two solenoids in conjunction, you can precisely control the air pressure in the brake system, ensuring effective braking performance. It's important to note that proper wiring and voltage are critical for the correct operation of solenoid valves, as electrical faults can impact their ability to open and close, affecting brake functionality.
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You'll need wiring and a 7-way connector
To convert air brakes to electric brakes, you'll need to finish the trailer with wiring and a 7-way connector. 10-gauge wire, # 10-2-1 is recommended. You will attach one wire from the brake magnet to the white wire for the ground, and the other to the black wire for power from the 7-Way connector.
The 7-Way Round RV Style Trailer Side Connector, # A7WCB, will then need to be wired at the front of the trailer. You can refer to an article that details wiring this connector, or watch a video installation showing the installation of trailer brakes on a single-axle trailer.
Next, you'll need to get your vehicle ready to connect to your OEM 7-Way trailer connector and activate the trailer brakes. You will need a brake controller and a wiring kit to complete the installation. The Prodigy P2 Brake Controller, # 90885, would be a good choice for your truck and trailer. This is a proportional controller that activates the trailer brakes in unison with the speed at which the vehicle is stopping. There will be a plug under the dash for installing a brake controller using the # 3034-P harness.
If your pickup has a 4-pole, you will still have the connector under the dash, and you will need wiring harness # 37185 that will connect to the wires on the frame rail.
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Electrically actuated air brakes are an option
To convert to electrically actuated air brakes, you will need to remove the existing air brakes and install new electric brakes. This process requires a range of components, including a hub and drum that match your trailer's bearings, seal, and wheel bolt pattern, as well as left and right brake assemblies. It is important to ensure compatibility with your trailer's axle and weight capacity.
Additionally, you will need to wire in solenoids to control the air flow to the brakes. One solenoid will open when power is applied and shut when power is removed, while the other will function in the opposite manner. A check valve is also necessary to prevent contaminants like water and mud from entering the brake system.
The Tekonsha Prodigy trailer brake controller is recommended for controlling the electric brakes. To finish the wiring, you will need a 10-gauge 7-way connector and wiring kit. This will allow you to connect the brake magnet to the ground and power sources.
It is important to note that converting air brakes to electric brakes can be a complex process, and it may be beneficial to seek professional assistance or refer to detailed guides specific to your vehicle and trailer setup.
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Frequently asked questions
Yes, it is possible to convert air brakes to electric brakes.
You will need a hub and drum that match the bearings and seal on your trailer spindle and your wheel bolt pattern. You will also need left and right brake assemblies, a brake controller, and a wiring kit.
Check the bearing and seal part numbers to ensure compatibility. You will also need to know the kind of axle you currently have on your trailer, its weight capacity, and the brake mounting flange bolt pattern.
If the hubs/axles are the same as another model with electric brakes, it should be a bolt-on. Otherwise, you may need to fabricate something or switch the axles. Some people suggest that it may be more cost-effective to sell the trailer and buy one with electric brakes.
You will need to remove the air brakes and install the electric brakes from scratch, following the manufacturer's instructions for wiring and connecting the brake controller.










































