Replacing Electric Trailer Brake Pads: A Step-By-Step Guide

how to change electric trailer brake pads

Electric trailer brakes are an important safety feature that should be regularly maintained and inspected. Brakes are the biggest wear item on trailers, and if they aren't maintained, safety issues can arise. This guide will cover the steps to change electric trailer brake pads, including removing the old brake pads, cleaning and inspecting the brake assembly, and installing new brake pads. It is important to note that this process may vary depending on the make and model of your trailer, and it is always recommended to consult a professional mechanic if you are unsure about any steps or have concerns about your trailer's braking system.

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Remove the wheel/tire from the axle to access the brake drum

To remove the wheel/tire from the axle to access the brake drum, begin by loosening all the lug nuts while the trailer is still on the ground. Next, jack up the trailer so that the tire is high enough off the ground to be removed. Support the trailer with jack stands. Now, remove the wheel/tire from the axle. With the wheel/tire removed, you will be able to access the brake drum and assembly.

The next step is to remove the dust cap from the axle hub to access the retaining nut. This can be done with channel locks, a large screwdriver, and a lot of finesse. Once the dust cap is removed, you can access the retaining nut, which needs to be removed in order to take off the brake drum. If there is a cotter pin or nut retainer, remove this first to allow the castle nut to be removed from the spindle. If there is a retaining clip, bend it to allow the nut to spin freely.

After removing the retaining nut, the brake drum can be taken off the spindle. The outer wheel bearing should be discarded and never reused. If the brake drum sticks and won't come off easily, gently tap the perimeter with a metal hammer until it frees up. Brake drums can become temperamental with age and use. Once the brake drum is removed, inspect it for excessive wear and uneven scoring.

With the drum removed, it's important to clean all the old grease from the brake drum and spindle. This is also an opportune moment to clean the zerk fitting by pumping it full of fresh grease. Check the bearing races for wear at this stage. If they are scarred, they will need to be replaced, which may require welding a metal rod to the race to pull them out.

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Check for wear and clean the brake drum

To check for wear and clean the brake drum of an electric trailer, you must first remove the brake drum. Start by loosening the lug nuts on the wheel of the trailer using a socket wrench. Once loosened, lift the trailer using a jack and place jack stands underneath for safety. Remove the lug nuts completely and take off the wheel to expose the brake drum.

With the wheel removed, you can now access the brake drum and begin the cleaning process. Use a brake cleaner to remove any old grease, dirt, or debris from the brake drum, spindle, and surrounding area. Pay close attention to the brake shoes, springs, and the inside of the drum, as these areas are prone to wear and damage. You should also inspect the spindle, grease seal, and all attachment hardware for any signs of wear or damage.

After cleaning and inspecting the brake drum, it's important to determine if it needs to be replaced. Look for excessive wear, uneven scoring, or physical damage. If the drum is in poor condition, it should be replaced. However, if the wear is minimal and the thickness is within specifications, the drum can be reused. If you are unsure, you can consult your local auto parts store for advice or have them inspect the drums.

Remember to perform this maintenance task regularly, such as at the beginning of each camping season, to ensure the safe operation of your electric trailer brakes.

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Inspect the brake controller

Inspecting the brake controller is an important step in ensuring the proper functioning of your electric trailer brake system. Here is a step-by-step guide to help you through the process:

Firstly, it is crucial to understand the type of brake controller you have. There are two basic types: time-delay and proportional or inertia-based. Time-delay controllers activate the trailer brakes with a fixed amount of power over time when the brake pedal is pressed. On the other hand, proportional controllers use an accelerometer to sense changes in momentum and apply power to the trailer brakes in proportion to the vehicle's momentum, providing smoother and more efficient braking.

Next, you need to check the trailer gain setting. Trailer gain refers to the amount of power the brake controller applies to the trailer brakes, and it should be set based on the trailer and load size. Higher gain settings are suitable for larger trailers, while lower gain settings are used for smaller trailers to prevent brake lockup. Refer to the manufacturer's specifications for the recommended trailer gain settings, and adjust accordingly by testing your trailer brakes at 25 mph. If the vehicle stops too slowly, increase the gain; if the brakes lock up, decrease it.

Additionally, inspect the brake controller's physical connection to the trailer wiring harness. Ensure that the harness is securely plugged into your vehicle, as this is essential for the brake controller to receive power and communicate with the trailer brakes.

If you have a proportional mode controller, be aware that during a stationary vehicle inspection, the trailer brakes may not activate since the vehicle is not decelerating. In this case, if you have a REDARC Tow-Pro Elite, you can temporarily switch it to "User Controlled" mode for testing.

Finally, familiarize yourself with the brake controller's interface and controls. It should have a display to view braking information and buttons to adjust the output and activate the brakes manually. Ensure that the brake controller is properly mounted in the cab of the vehicle and easily accessible to the driver.

By following these steps, you can effectively inspect your electric trailer brake controller and ensure it is functioning correctly. Regular inspections and maintenance are crucial for the safety of your vehicle and trailer setup.

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Reinstall the trailer's tires

Once you have finished replacing the brake pads, you can reinstall the trailer's tires. This process should be carried out with care and attention to ensure the safety of yourself and others on the road.

First, you will need to lower the trailer slowly and carefully back down to the ground. You can then tighten the lug nuts securely. It is important to ensure that the trailer is secure and stable before proceeding.

Next, you will need to reattach the wheels. This can be done with a tire iron, which is a basic mechanical tool that will allow you to safely reattach the wheels. Ensure that the wheels are securely attached before moving on.

After reattaching the wheels, you should test the brakes for proper actuation. Drive with caution until the brakes have had time to break in properly. If the trailer pulls to one side when the brakes are activated, you may need to adjust the brake shoes.

Finally, it is important to regularly inspect your brakes for any signs of wear and tear. Look for any issues with the brake pads, drums, and rotors, and check for any rust or damage. By regularly maintaining your trailer brakes, you can ensure your safety and prolong the life of your trailer.

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Run a final actuation test

Once you have replaced the brake pads on all axles, it is time to run a final actuation test. This test checks if the electric side of your trailer brake system has been configured correctly, including the crimping system wires. To do this, use a voltmeter or a similar testing device to measure the maximum voltage output. If the voltmeter does not register a maximum voltage output in less than five seconds, or if the readings do not match the manufacturer's schematics, there may be a problem with the trailer brake. Wiring problems are rare if all installation steps have been followed correctly.

After replacing the brake pads, it is recommended that you test for proper actuation. Drive cautiously until the brakes have had time to break in properly. If the trailer pulls to one side when the brakes are activated, you may need to adjust the brake shoes.

To adjust the brake shoes, use a trailer brake spoon, brake adjustment tool, or flathead screwdriver to turn the star wheel adjuster inside the brake chamber. The adjuster is typically located below the brake drum. Push down on the brake spoon handle so the adjuster wheel is pried upward. This will tighten the brake pads or shoes. Turn the wheel one click at a time, and spin the tire between each click to make sure it spins freely. Once the trailer tire becomes difficult to turn, stop tightening the adjuster.

If you need to loosen the adjuster wheel, simply pry upward on the adjustment tool. The tire should spin freely but still have a slight scraping sound or slight drag, indicating that the trailer brake pads are properly engaged.

Frequently asked questions

Changing electric trailer brake pads can be a complex process and it is recommended to get a professional mechanic to do it. However, if you want to do it yourself, you will need to follow these general steps:

- Begin by breaking loose all the lug nuts while the trailer is on the ground.

- Jack the trailer up and remove the tire(s).

- Remove the dust cap from the axle hub to access the retaining nut.

- Remove the cotter pin or nut retainer, and then the castle nut from the spindle.

- Take out the retaining nut from the axle spindle, and then the brake drum.

- Clean all the old grease from the brake drum and spindle.

- Check for wear and replace the brake assembly or individual components as needed.

- Reinstall the trailer's tires and torque the lug nuts to their designated factory specs.

- Run a final actuation test to ensure the electric side of the trailer brake system is working.

You will need a jack, jack stands, a torque wrench or similar tool, channel locks, a large screwdriver, a metal hammer, and a brake controller to run the final test. You may also need a trailer brake spoon, brake adjustment tool, or flathead screwdriver to adjust the brake pads.

It is recommended that brand new trailers have their brakes inspected and adjusted near the 200-mile mark. After that, trailer brakes can be inspected roughly once a year during annual licensing inspections or as frequently as your trailer towing frequency requires.

Yes, it is important to exercise caution when working on your trailer brakes. If you are unsure about any aspect of the process, it is always best to consult a professional mechanic. In addition, make sure to lubricate wheel bearings every 12,000 miles to maintain the health of your brakes.

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