Electric Trailer Brake Maintenance Tips (And When to Upgrade)

Electric trailer brakes are reliable, but like any braking system, they wear over time. Exposure to road salt, moisture, and storage conditions can also introduce corrosion. Routine maintenance keeps your brakes working safely, consistently, and predictably.

Why Electric Trailer Brake Maintenance Matters 

Without routine maintenance, wear and electrical issues can reduce braking effectiveness, leading to:

• Reduced braking power
• Uneven braking between wheels
• Increased stopping distances
• Excessive heat and premature component wear
  

Regular maintenance helps ensure predictable braking performance and extends the life of the trailer brake system.

5 Key Maintenance Steps 

1. Inspect Brakes Annually (or Every 12,000 Miles)
Remove the brake drum and check:

• Magnet
  • Look for grooves, uneven wear, or scoring
  • Surface should be flat with center dimples visible
• Brake shoes
  • Minimum thickness: 1/16”
  • Replace if contaminated, cracked horizontally, or missing material
  • Small vertical cracks are normal
  • 
    
• Brake drum
  • Check for heat spots, grooves, cracks, or glazing
• Brake mechanism
  • Look for corrosion that could cause sticking or uneven braking

Even low-mileage trailers need annual inspection due to corrosion risk.

2. Clean & Lubricate Components

After removing the drum:

• Use brake cleaner spray (not compressed air)
• Let components fully dry
• Apply high-temp brake grease to:
  • Magnet arm pivot point
  • Adjuster screw threads

This small step helps prevent corrosion and extends brake life.

3. Adjust the Brakes at Regular Intervals

Standard electric trailer brakes need manual adjustment as shoes wear about every 3,000 miles

• Access the adjustment port on the back of the brake
• Use a brake tool or screwdriver to turn the star wheel
• Adjust until proper drag is achieved

Note: Dexter® Nev-R-Adjust® electric brakes do not require periodic manual adjustment.

4. Inspect Trailer Brake Wiring

Inspect both inside and outside the brake assembly:

Look for:

• Frayed wires
• Loose connections
• Corrosion

Ensure wiring is:

• Secure (use zip ties if needed)
• Flexible enough for axle movement

Upgrade connectors if needed:

• Replace insulation-piercing connectors
• Use heat-shrink, weather-sealed connectors for better reliability

5. Test Brake Controller Output

Confirm your system is working properly:

• Check for:  
  • Proper voltage output  
  • Smooth braking response  
  • Even performance across all wheels  
• Target performance:  
  • ~2.5–3 amps per brake at full power  

If one wheel reads low or zero, it likely indicates a wiring issue.

Replacing Brake Components
If parts are worn:

• You can replace:
  • Magnets
  • Brake shoes
  • Hardware kits
• Many prefer replacing the entire brake assembly for:
  • Simpler installation
  • Factory-set adjustment
  • Warranty coverage

👉 Always replace brakes on both sides of the same axle to maintain even braking. 

Upgrade Option: Forward Self-Adjusting Brakes

Dexter® Nev-R-Adjust® Brakes

These brakes automatically maintain proper adjustment as components wear.

Benefits:

• No manual adjustments
• Consistent braking performance
• Reduced maintenance

Ideal for:

• RVs and travel trailers
• Utility and cargo trailers
• Horse and livestock trailers
• Frequent or commercial towing

Ready to upgrade or find the right brake kit for your trailer?

👉 Visit the Dexter Index to get started

Final Thoughts

Routine brake maintenance doesn’t take much time, but it makes a big difference in safety, performance, and long-term reliability. 

If you want to reduce maintenance, upgrading to a self-adjusting system is a simple, bolt-on solution.