Electric drum brakes typically require a break-in period (burnishing) before they reach full braking performance.
This applies to new axles and whenever new brake shoes or magnets are installed.
Burnishing allows the new brake shoes and magnets to properly seat against the brake drum.
How Do You Break In New Electric Trailer Brakes?
Lippert provides a specific burnishing procedure for its electric drum brakes:
- Start at approximately 40 mph in a safe location where you have plenty of room to slow the truck and trailer.
- Apply approximately 8–10 volts to the trailer brakes.
- Allow the trailer brakes to slow the truck and trailer to approximately 20–25 mph. For best results, Lippert recommends not using the truck's brakes during this step so the trailer brakes are doing the braking work.
- Allow about one mile between brake applications to help prevent the brake linings from overheating.
- Repeat the process as the brakes seat in. Lippert notes that you may feel a noticeable improvement in braking performance after as few as 10 applications. The full break-in period can take approximately 20–50 applications, with the brake lining developing close to full contact with the drum surface by the end of the process.
Important: This procedure should only be performed in a safe location and according to the instructions for your specific brake and axle system. Always follow the brake/axle manufacturer's procedure rather than assuming every trailer uses the same process.
Don't Forget the First Adjustment
For the Lippert electric drum brakes covered by its guidance, Lippert recommends manually adjusting the brakes after the first 200 miles of operation and periodically thereafter at approximately 3,000-mile intervals.
Check the recommendations for your specific axle and brake system, as maintenance requirements can vary.
A Few Good Trailer-Brake Habits
Regardless of whether your brakes are new, it's a good idea to:
- Visually inspect your trailer brakes regularly.
- Check trailer-brake operation after hooking up and before getting on the road.
- Follow the manufacturer's maintenance recommendations.
- Have the brakes inspected if braking performance changes or something doesn't feel right.
Behind You All The Way.