How to 2017 Silverado Service Trailer Brake System

Owning a 2017 Chevrolet Silverado comes with a lot of power and responsibility, especially if you’re regularly towing trailers. One of the essential systems that ensure safe towing is the trailer brake system, which can sometimes show the dreaded “Service Trailer Brake System” message on the dashboard. This alert indicates that there’s a problem with the electric trailer brake system, which needs to be addressed to ensure the brakes function correctly when towing.

In this blog, we’ll cover what the trailer brake system does, why the “Service Trailer Brake System” message may appear on your 2017 Silverado, and how to service the system to keep your vehicle and trailer safe on the road.

What is the Trailer Brake System?

The trailer brake system in the 2017 Silverado is designed to control the electric brakes on a towed trailer. The system works with a brake controller, which communicates between your truck and the trailer to ensure smooth, proportional braking. The system applies the appropriate amount of braking force to the trailer when you press the brake pedal in the truck, allowing both the truck and trailer to slow down or stop simultaneously.

A properly functioning trailer brake system is vital for safe towing, particularly when hauling heavy loads. It reduces the risk of trailer sway, improves overall braking performance, and minimizes wear on your truck’s brakes.

Mechanic inspecting the trailer brake system of a 2017 Silverado, including the brake controller and wiring.

Why Does the “Service Trailer Brake System” Message Appear?

There are several reasons why your 2017 Silverado might display the “Service Trailer Brake System” message. Understanding the root cause will help you diagnose and resolve the issue. Common causes include:

  1. Wiring Issues
    Loose, corroded, or damaged wiring between the truck and trailer can disrupt the electrical connection. This is a common reason for the service message to appear, as the truck may be unable to communicate with the trailer brakes effectively.
  2. Faulty Brake Controller
    The brake controller inside your truck regulates the braking force sent to the trailer. If the controller is malfunctioning, it may not send the correct signals to the trailer brakes, triggering the warning.
  3. Blown Fuses or Relays
    Fuses and relays in the truck’s electrical system help power the trailer brake system. If a fuse blows or a relay fails, the system may lose power, resulting in the service warning.
  4. Brake Magnet or Brake Assembly Failure
    The brake magnets or other components within the trailer’s braking system could be worn or damaged. These parts help apply braking force to the trailer, and any failure here could cause the service alert to appear.
  5. Software Issues
    Occasionally, the problem could be a software glitch in the Silverado’s onboard computer, causing a false positive error code even when the system is functioning correctly.

How to Diagnose the Trailer Brake System Issue

When the “Service Trailer Brake System” message appears, it’s essential to inspect and diagnose the problem to prevent unsafe towing. Here’s a step-by-step guide to diagnosing the issue:

Step 1: Inspect the Wiring

The wiring that connects your truck and trailer is often the culprit behind this error message. Follow these steps to inspect it:

  • Check the 7-Pin Connector: Examine the trailer connector for dirt, corrosion, or debris that could disrupt the connection. Clean the contacts as needed and ensure the connector is seated securely.
  • Inspect the Wiring Harness: Look for any signs of damage, such as frayed wires or exposed conductors. Pay close attention to areas where the wiring is exposed to potential wear, such as near the hitch.
  • Test for Continuity: Use a multimeter to test for continuity in the trailer brake wiring. A break in the wire or a poor connection could be causing the service message.

Step 2: Test the Brake Controller

The brake controller in your Silverado is a critical component of the trailer brake system. Here’s how to test it:

  • Check for Error Codes: Many brake controllers can display error codes. If yours does, consult the user manual to understand what the code means and how to resolve it.
  • Manual Activation Test: While the truck is parked, use the brake controller’s manual activation switch to apply the trailer brakes. You should feel resistance when trying to move the truck forward. If the brakes aren’t engaging, the controller may be malfunctioning.
  • Verify Power Supply: Ensure the brake controller is receiving power. A blown fuse or faulty wiring can prevent the controller from functioning correctly.

Step 3: Inspect the Trailer’s Braking Components

If the issue isn’t with the truck’s wiring or controller, the problem may lie in the trailer’s braking system. Here’s how to inspect the trailer brakes:

  • Check the Brake Shoes and Drums: Remove the trailer’s wheels and inspect the brake shoes and drums for wear. If they are worn down or damaged, replace them.
  • Test the Brake Magnets: The brake magnets engage the brake drums when power is applied. Use a multimeter to check the resistance of the magnets. If they are outside the recommended range, replace them.
  • Adjust the Brake Shoes: If the shoes are not properly adjusted, they may not make proper contact with the brake drums, causing poor braking performance. Use a brake adjustment tool to correct the shoe alignment.

Step-by-Step Guide to Servicing the Trailer Brake System

Once you’ve diagnosed the problem, it’s time to service the trailer brake system. Follow this step-by-step guide to restore your system to optimal working condition.

Step 1: Gather the Necessary Tools and Materials

Before you begin, make sure you have the following tools and materials:

  • Replacement brake shoes, magnets, or assemblies (as needed)
  • Jack and jack stands
  • Socket wrench set
  • Multimeter
  • Wire strippers and connectors
  • Brake cleaner
  • Torque wrench

Step 2: Lift the Trailer

Use a jack to lift the trailer high enough to remove the wheels. Place jack stands under the trailer frame for stability and safety. Ensure the trailer is securely supported before starting any work.

Step 3: Remove the Wheels and Brake Drum

  • Remove the Wheels: Use a lug wrench to remove the lug nuts from the wheels. Take off the wheels to access the brake assembly.
  • Remove the Brake Drum: Gently pull the brake drum off the hub. If it’s difficult to remove, tap it lightly with a rubber mallet to loosen it.

Step 4: Replace the Worn Components

If your inspection revealed worn or damaged components, replace them with new parts:

  • Replace the Brake Shoes: If the shoes are worn, replace them according to the manufacturer’s instructions.
  • Replace the Brake Magnets: If the brake magnets are damaged or out of spec, install new ones. Ensure they are properly seated in the brake assembly.

Step 5: Reassemble the Brake System

Once the new components are installed:

  • Reinstall the Brake Drum: Slide the brake drum back onto the hub, ensuring it fits securely over the brake shoes.
  • Reinstall the Wheels: Reinstall the wheels and tighten the lug nuts by hand. Lower the trailer off the jack stands and finish tightening the lug nuts with a torque wrench.

Step 6: Test the Trailer Brakes

After servicing the brakes, perform a test to ensure everything is working properly:

  • Manual Brake Test: Use the brake controller’s manual activation switch to apply the trailer brakes. Ensure the brakes engage and hold the trailer in place.
  • Road Test: Take your truck and trailer for a short drive to test the brakes under normal conditions. Ensure the trailer brakes engage smoothly and consistently.

Preventative Maintenance Tips

To avoid future trailer brake system issues, follow these preventative maintenance tips:

  • Inspect the Wiring Before Each Trip: Check the trailer connector and wiring for any signs of damage or wear before each trip. This simple check can prevent issues on the road.
  • Test the Brake Controller Regularly: Periodically test the brake controller to ensure it’s functioning properly. Adjust the controller settings as needed based on the weight of the trailer.
  • Annual Brake Maintenance: Schedule an annual inspection of the trailer’s brake system. This includes checking the shoes, drums, and magnets for wear and replacing any worn components.

Conclusion

Servicing the trailer brake system on your 2017 Silverado is essential for safe towing. By diagnosing and resolving issues with the wiring, brake controller, or braking components, you can restore your trailer brake system to full functionality. Regular maintenance and prompt repairs will keep your trailer brake system working correctly, giving you peace of mind while towing.

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