3,500 lb Electric Trailer Brake Conversion Kit – 10" x 2.25" Brakes, 5 on 4.75 Hub Drums
Complete electric brake conversion and service package for compatible 3,500 lb trailer axle setups using 10" x 2.25" brakes, a 4-bolt brake flange, 5 on 4.75" hub drums, and L68149 inner / L44649 outer bearings.
Quick Specs
| Fitment Point | Required Match |
|---|---|
| Axle Rating | 3,500 lb compatible trailer axle configuration |
| Brake Size | 10" x 2.25" electric brake assemblies |
| Brake Mount | 4-bolt brake mounting flange |
| Hub Drum Bolt Pattern | 5 on 4.75" |
| Bearing Configuration | L68149 inner bearing / L44649 outer bearing |
| Wheel Stud / Lug Nut | 1/2"-20 wheel hardware; 60-degree coned lug nuts included |
| Kit Style | Curated add-brakes conversion and hub drum service kit with battery kit included |
| Primary Use Case | Adding electric brakes to a compatible idler axle trailer or refreshing brake and hub drum components on a compatible 3,500 lb axle |
Overview
This R&P Carriages electric trailer brake conversion kit is built for compatible 3,500 lb trailer axle setups that match the listed brake size, brake flange, hub drum bolt pattern, bearing numbers, and wheel hardware. It brings together left-hand and right-hand 10" x 2.25" electric brake assemblies, two 5 on 4.75" hub drums, bearing kits, lug nuts, cotter pins, brake mounting hardware, and a boxed add-brakes kit with battery for a more complete conversion or service package.
R&P Service Insight
Brake conversion work is not just a backing plate swap. The hub drums, bearing configuration, brake flange pattern, wheel bolt pattern, mounting hardware, lug hardware, and electrical safety components all need to match the trailer before installation.
- Conversion Use: Intended for compatible idler axle trailers being upgraded to electric brakes.
- Service Use: Also useful when replacing worn brake assemblies and hub drums as a matched 3,500 lb service package.
- Fitment Discipline: Always verify the spindle, seal requirements, brake flange, bolt pattern, and wiring needs before ordering.
R&P Knowledge Hub
Compatibility: Designed for trailer applications where the axle rating, 10" x 2.25" brake size, 4-bolt brake mounting flange, 5 on 4.75" hub drum bolt pattern, L68149 inner bearing, and L44649 outer bearing configuration match.
Vehicle / System Fit: Trailer electric brake conversion and hub drum service applications for compatible 3,500 lb axle setups.
Installation Notes: Confirm axle rating, brake size, brake flange pattern, wheel bolt pattern, inner and outer bearing numbers, seal requirements, spindle compatibility, wiring, and breakaway/add-brakes battery requirements before installation.
Performance Insight: A complete conversion package helps keep the major brake, hub drum, bearing, lug, and mounting components aligned to the same application instead of sourcing each wear item separately.
Brand & Fitment Note
Selling Brand: R&P Carriages curated trailer brake conversion kit.
Application Reference: Any axle, brake, hub, bearing, or trailer references in this listing describe compatibility requirements only where the measurements, mounting points, bearing numbers, and configuration match.
What This Means: This listing is for an R&P Carriages curated kit, not a guaranteed OEM-branded item unless separately stated and verified.
Before Ordering: Verify measurements, mounting style, brake orientation, hub drum bolt pattern, bearing numbers, seal requirements, spindle fit, wheel hardware, wiring needs, and included components before installation.
R&P Repair Insight
Before converting an idler axle to electric brakes, confirm the axle has the correct brake mounting flange and that the spindle accepts the listed bearing combination. A 3,500 lb axle rating alone is not enough to guarantee fitment.
- Brake Flange Check: Confirm your axle has a 4-bolt brake mounting flange for 10" brake assemblies.
- Bearing Check: Match the existing or required bearing numbers to L68149 inner and L44649 outer before ordering.
- Hub Pattern Check: Confirm your wheels require a 5 on 4.75" bolt pattern and 1/2"-20 lug hardware.
- Electrical Check: Verify your trailer wiring and breakaway/add-brakes battery requirements before towing after installation.
Features
Complete Brake Conversion Package
Includes left-hand and right-hand 10" x 2.25" electric brake assemblies, hub drums, bearing kits, lug nuts, mounting hardware, cotter pins, and a boxed add-brakes kit with battery.
Built Around 3,500 lb Trailer Axles
Configured for compatible 3,500 lb axle applications using 4-bolt brake mounting and the common L68149 inner / L44649 outer bearing setup.
5 on 4.75" Hub Drum Setup
Includes two 3,500 lb hub drums with a 5 on 4.75" wheel bolt pattern and 1/2" wheel studs for matching trailer wheel applications.
Useful for Conversion or Refresh Work
Best for adding electric brakes to a compatible idler axle trailer or replacing worn brake and hub drum components as a more complete service package.
Specifications
| Specification | Detail |
|---|---|
| SKU | 945475-C-FSA-IMP |
| Brand | R&P Carriages |
| Product Type | Electric trailer brake conversion kit |
| Axle Rating | 3,500 lb compatible applications |
| Brake Size | 10" x 2.25" |
| Brake Mount | 4-bolt brake mounting pattern |
| Hub Drum Bolt Pattern | 5 on 4.75" |
| Hub Drum Stud Size | 1/2" studs |
| Lug Nut Size | 1/2"-20 x 13/16", 60-degree coned |
| Inner Bearing | L68149 |
| Outer Bearing | L44649 |
| Hub Drum Color | Green hub drums listed in kit BOM |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Trailer electric brake and hub drum system |
| Primary Fit | Compatible 3,500 lb trailer axles using 10" x 2.25" brakes, 4-bolt brake mounting flange, and 5 on 4.75" hub drums |
| Conversion Use | Adding electric brakes to a compatible idler axle trailer |
| Service Use | Refreshing brake assemblies, hub drums, bearings, lug nuts, cotter pins, and related brake mounting hardware on a compatible setup |
| Notes | Verify axle rating, brake flange, brake size, hub bolt pattern, bearing numbers, seal requirements, spindle compatibility, wiring, and breakaway/add-brakes battery requirements before ordering or installing. |
Included Components
| Quantity | Item |
|---|---|
| 1 | 10RVBLH — Electric brake assembly, 3,500 lb, 10" x 2.25", 4-bolt, left-hand |
| 1 | 10RVBRH — Electric brake assembly, 3,500 lb, 10" x 2.25", 4-bolt, right-hand |
| 2 | 165649 — Cotter pin, 1/8" x 1-3/4" |
| 8 | 5-8 — Split lock washer, 7/16", for 10" and 7" backing plate hardware |
| 8 | 6-17 — 7/16"-20 hex nut, zinc, for 10" and 7" backing plate hardware |
| 2 | 945475-1 — Hub drum, 3,500 lb, 5 on 4.75", green, 1/2" stud |
| 1 | ABTK-BOXED-BTRY — Add Brakes complete kit with battery |
| 2 | HD-3500-KIT — Hub/drum bearing kit, 3,500 lb, L44649 / L68149 |
| 10 | X1023R — 1/2"-20 x 13/16" lug nut, 60-degree coned |
