Otis Singleton
Adjusting the brakes on a trailer is an important safety measure that should be done regularly. Electric trailer brakes use electrical signals, electromagnets, and brake pads to help the trailer stop while towing. The process of adjusting them involves first elevating the trailer to access the brakes, then using a tool like a brake spoon or flathead screwdriver to adjust the star wheel adjuster. This will either tighten or loosen the brake pads, depending on the direction you turn the adjuster. It is recommended to check and adjust trailer brakes every 3,000 miles or 3 months, and testing should be done at slow speeds of around 20-30 mph.
Characteristics and Values Table for Adjusting Electric Brakes on a Trailer
| Characteristics | Values |
|---|---|
| Frequency of Adjustment | Every 3,000 miles or 3 months |
| Tools Required | Trailer jack stands, flathead screwdriver, brake adjusting spoon/wrench/tool, brake controller |
| Adjustment Process | Elevate trailer, remove cover/cap/plug, adjust brakes using tools, test at slow speed (~20 mph), repeat as needed |
| Brake Controller Settings | Dependent on load, adjust until vehicle and trailer stop smoothly |
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What You'll Learn
How to elevate a trailer to access the brakes
To elevate a trailer to access the brakes, you will need to follow a few important steps. Firstly, place the trailer jack stands on the trailer's frame, ensuring they are positioned under the frame and not the axle. This is an important safety precaution. Then, start cranking the jack until the wheel can rotate freely without any obstruction. It is crucial to keep the jack stands in place while you make adjustments to the brakes, so do not remove them.
Now that the trailer is elevated, you can begin to access the brakes. To do this, remove the brake access cover or protection cap, which is usually a small circular or oval-shaped plastic or rubber plug near the axle or on the inside of the tire. You can use a flathead screwdriver to carefully pry this out. Once the cover is removed, you will be able to see the star wheel adjuster, which is a spiked gear wrapped around a long cylinder spool. This mechanism is responsible for adjusting the brake lining against the drum.
With the trailer elevated and the brake access cover removed, you can now proceed with adjusting the brakes by using a brake spoon, brake adjustment tool, or screwdriver to turn or pry the star wheel adjuster. This process will ensure that your trailer brakes are properly calibrated, allowing for smooth and cohesive stopping power.
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Removing the cover, cap or plug to access the brake chamber
Removing the cover, cap, or plug to access the brake chamber is a crucial step in adjusting electric brakes on a trailer. This step ensures you can access the necessary components for brake adjustment. Here is a detailed guide on how to do it:
First, identify the location of the cover, cap, or plug. Typically, it is located on the inside of the tire, near the axle. Most trailers, including RVs, have a cover that needs to be removed to access the brakes. The number of covers can vary; some trailers have one cover per wheel, while others have multiple. If you are unsure about the location, refer to the trailer's user manual for specific instructions.
Once you have located the cover, cap, or plug, it's time to remove it. Look for a circular or oval-shaped plastic or rubber plug on the tire. Using a flathead screwdriver, carefully pry it off. The access cover or protection cap is usually small, about the width of your thumb. Be gentle during this process to avoid damaging the plug or the surrounding area.
After removing the cover, cap, or plug, you will have exposed the brake chamber. This area houses the critical components for brake adjustment, including the star wheel adjuster and the brake pads. It is essential to keep this area clean and free of debris to ensure the brakes function optimally.
In some cases, especially with RV trailers, you may need to remove the dust cover from the axle entirely to access the star wheel adjuster. This step depends on the make and model of your trailer, so refer to your user manual or consult a professional if you are unsure.
By following these steps, you will be able to safely and effectively remove the cover, cap, or plug to access the brake chamber. Remember always to refer to your trailer's specific instructions and take the necessary safety precautions when working on any brake adjustment project.
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Using a brake spoon, wrench or screwdriver to adjust the brakes
To adjust the brakes on a trailer using a brake spoon, wrench, or screwdriver, follow these steps:
First, chock the trailer wheels and jack up one side of the trailer, placing the jack under the trailer frame, not the axle. Raise the jack until the wheel is able to spin freely, and secure a jack stand under the frame for support. Next, remove any covers, caps, or plugs that may be present to access the trailer brakes. These can usually be pried out with a flathead screwdriver.
Now, you can begin to adjust the brakes using your tool of choice. Insert the tool into the brake chamber and turn the star wheel adjuster. Pushing down on the brake spoon handle will tighten the brake pads against the brake drums, while prying upward will loosen them. The adjuster wheel should be tightened so the trailer tire turns freely with a slight scraping sound, indicating the trailer brake pads are engaged.
Spin the tire between adjustments and stop tightening once the trailer tire becomes difficult to turn. If you need to, pry upward on the adjustment tool to loosen the adjuster wheel. Finally, replace the cover on the trailer brake access point, and check the torque on your trailer tire nuts.
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Adjusting the brakes while travelling at a slow speed
Adjusting the brakes on your trailer while travelling at a slow speed can be done by following these steps:
Firstly, it is important to understand that the process of adjusting electric trailer brakes involves regulating the power delivered to the brake pads or shoes through electrical signals and electromagnets. The brake controller, an electronic device, plays a crucial role in this process by allowing you to monitor and adjust the braking activity.
Now, to begin the adjustment process, make sure you are travelling at a slow speed, around 20-30 mph. At this speed, you should apply the brakes fully using the manual lever on the brake controller and then release them. This action will ensure that the trailer brakes are activated independently of the vehicle brakes. Repeat this process several times, but be cautious not to do it too frequently to avoid overheating the brakes.
As you continue to apply and release the brakes, pay attention to how the trailer responds. You will know that the adjustment is adequate when you feel a smooth and controlled deceleration without any signs of the trailer wheels locking up. This fine-tuning process is essential to ensure that your trailer brakes effectively slow down your vehicle, especially when carrying different load sizes.
Additionally, it is worth noting that some trailers have self-adjusting brakes, which automatically adjust every time you hit the brake pedal or engage the manual override lever while driving. However, for trailers without self-adjusting brakes, the manual adjustment process described above is necessary to ensure proper braking performance.
By following these steps and paying attention to how your trailer responds during the adjustment process, you can effectively fine-tune your electric trailer brakes while travelling at a slow speed. Remember to refer to the manufacturer's guidelines and seek professional assistance if you have any concerns or challenges during the process.
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How to determine the correct brake gain
Adjusting the brake gain on your trailer is important for towing safely. The gain setting of a time-delay brake controller can be adjusted by the driver to accommodate each specific trailer. A proportional or inertia-based brake controller, on the other hand, uses an electrical circuit called an accelerometer to sense changes in momentum and applies power in proportion to the vehicle's momentum.
To determine the correct brake gain, follow these steps:
- Ensure your vehicle and trailer are parked on a level surface and in a safe, open area with plenty of stopping distance and no other traffic around.
- With your trailer coupled to your vehicle, make sure the trailer wiring harness is plugged into your vehicle.
- Load the trailer to its normal level for your trip.
- Accelerate to a speed of 15-30 mph on a safe road.
- Keep your foot off the brake of the truck and smoothly apply the manual brake actuation lever (on the controller) until it is fully deflected.
- Adjust the gain until the trailer slows down the vehicle without locking up the trailer wheels. You want the brakes to activate and slow the trailer, not the entire rig.
- Test several times until you get a feel for your trailer and the loads you typically carry.
- Refer to the manual for your brake controller for further details and guidance.
Note that the optimal gain setting may vary depending on factors such as trailer loading and road conditions. It is recommended that you check and adjust your trailer brakes every 3,000 miles or 3 months.
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Frequently asked questions
It is recommended that you check and adjust your trailer brakes every 3,000 miles or 3 months, depending on how often you tow your trailer.
First, elevate your trailer to access the brakes. Place jack stands on the trailer's frame, crank it up, and stabilize the tires with chock blocks. Remove the cover, cap, or plug to access the brake chamber and adjustment wheel. Then, use a trailer brake spoon, brake adjustment tool, or flathead screwdriver to turn the star wheel adjuster. Turn the wheel slowly, one click at a time, until the tire is difficult to turn. Then, turn the wheel in the opposite direction and back it off until you feel drag. Adjust all the tires in the same way.
While traveling at a slow speed (around 20-25 mph), apply the brakes fully and release. Repeat this process several times to test the brakes. The trailer brakes should slow the vehicle down without locking up the trailer wheels. You will feel when the adjustment is adequate.
