Beefed Up Trailer Axle Backing Plate With Electric Right Hand Brake Flange 12.25 By 3.5 Inch Five Bolt Pattern Fits 9K 10K 12K Axles For RV Campers Durable Trailer Brake Assembly

Heavy-Duty RSA Trailer Backing Plate, 5-Bolt (Single)
✔️ 12.25" x 3.5", right-hand, 5-bolt flange, fits 9K-12K axles

This heavy-duty trailer brake backing plate is designed for electric drum brakes on RVs, campers, and heavy-duty trailers. It features Reverse Self-Adjusting RSA technology to keep shoe clearance consistent in forward and reverse operation, simplifying maintenance and improving braking reliability.

✅ 12.25" x 3.5" backing plate size (311 mm x 89 mm) for RSA electric drum brakes
✅ Right-hand orientation for a 5-bolt brake flange
✅ Fits 9K, 10K, and select 12K axle ratings (verify application)
✅ RSA automatically maintains shoe clearance, reducing manual adjustments

💡 What is a heavy-duty trailer brake backing plate with RSA used for? This handy component helps keep brakes aligned and reduces maintenance.

- RSA automatically maintains clearance between brake shoes and drum - Fits 9K-12K axles with a 5-bolt flange - Reduces manual adjustments and improves braking consistency - Ideal for RVs, fleets, and heavy trailers