Pair of 12-1/4" × 3-3/8" Self-Adjusting 10K GD Electric Trailer Brake Assemblies
Matched left-hand and right-hand self-adjusting electric brake assembly pair for one trailer axle using 12-1/4" × 3-3/8" brakes on compatible 9,000–10,000 lb General Duty trailer axle applications.
Overview
This R&P Carriages brake assembly set includes one left-hand and one right-hand self-adjusting electric brake backing plate assembly. The pair services one trailer axle using 12-1/4" × 3-3/8" electric brakes on select 9,000–10,000 lb General Duty trailer axle applications where the brake size, 7-bolt mounting flange, drum style, and orientation match.
R&P Service Insight
Replacing electric brake assemblies as a matched left/right axle pair helps restore more balanced braking across the axle when the existing shoes, magnets, or hardware are worn.
- Axle Pair Service: This listing includes two brake assemblies: one left-hand and one right-hand.
- Fit Check Required: Confirm 12-1/4" brake diameter, 3-3/8" shoe width, and 7-bolt flange before ordering.
- Common Size Conflict: Some 10K heavy-duty applications use 12-1/4" × 4" brakes instead of the 12-1/4" × 3-3/8" General Duty size.
R&P Knowledge Hub
Compatibility: Designed for compatible 12-1/4" × 3-3/8" self-adjusting electric brake applications using a 7-bolt brake mounting flange.
Vehicle / System Fit: Used on select 9,000–10,000 lb General Duty trailer axle applications, including compatible Lippert 10K GD-style and Dexter-style 7-bolt electric brake setups where measurements and mounting points match.
Installation Notes: Verify brake size, shoe width, drum style, axle rating, mounting flange, and left/right orientation before installation.
Performance Insight: Self-adjusting brake assemblies are designed to help maintain brake shoe position over time when used in the correct compatible brake and drum system.
Brand & Fitment Note
Selling Brand: R&P Carriages
Application Reference: Lippert and Dexter reference numbers in this listing are used only to help identify compatible brake applications where dimensions, mounting pattern, drum style, and configuration match.
What This Means: This listing is for an R&P Carriages brake assembly set, not a guaranteed OEM-branded item unless specifically stated and verified.
Before Ordering: Verify measurements, mounting style, axle/brake specifications, drum compatibility, left/right orientation, and included components before installation.
R&P Repair Insight
Brake fitment on 10K trailer axles can be confusing because similar axle ratings may use different shoe widths and mounting patterns. The most important checks are brake size, flange pattern, drum compatibility, and whether the axle uses the General Duty or Heavy Duty brake package.
- Brake Width Check: This listing is for 3-3/8" wide shoes, not 4" wide heavy-duty brake assemblies.
- Mounting Check: This set is for 7-bolt brake flanges and does not fit 4-bolt brake flanges.
- Quantity Check: One pair services one axle. Tandem axle trailers typically require two left-hand and two right-hand assemblies.
Features
Matched Left / Right Pair
Includes one left-hand and one right-hand electric brake backing plate assembly for servicing one trailer axle.
Self-Adjusting Design
Self-adjusting configuration helps maintain brake shoe position over time when installed on a compatible brake and drum system.
10K GD Brake Size
Built for 12-1/4" × 3-3/8" electric trailer brake applications commonly used on compatible 9K–10K General Duty axles.
7-Bolt Mounting Pattern
Designed for compatible 7-bolt brake mounting flanges. Always confirm your existing flange before ordering.
Specifications
| Specification | Detail |
|---|---|
| Part Number | BK-10KE-SET |
| Brand | R&P Carriages |
| Product Type | Electric trailer brake backing plate assembly pair |
| Brake Type | Electric, self-adjusting |
| Brake Size | 12-1/4" × 3-3/8" |
| Mounting Pattern | 7-bolt brake flange |
| Application | Compatible 9,000–10,000 lb General Duty trailer axle brake applications |
| Set Configuration | One left-hand assembly and one right-hand assembly |
| Axle Coverage | Services one trailer axle |
Fitment / Application
| Category | Details |
|---|---|
| Vehicle / System | Electric trailer brake system |
| Primary Fit | 12-1/4" × 3-3/8" 10K GD-style electric brake applications with 7-bolt mounting flange |
| Application References | Lippert references 181936 and 181935; Dexter references 023-450, 023-451, 023-450-00, and 023-451-00 |
| Not For | 12-1/4" × 4" heavy-duty brake setups or 4-bolt brake flanges |
| Notes | Verify brake shoe width, drum size, axle rating, mounting flange, and left/right orientation before ordering. |
Included Components
| Quantity | Item |
|---|---|
| 1 | Left-hand self-adjusting electric brake backing plate assembly |
| 1 | Right-hand self-adjusting electric brake backing plate assembly |
| Included on assemblies | Installed brake shoes, magnet, adjuster hardware, and lead wires |
