Electric Trailer Brakes / 10K General Duty Axle Service
Electric Brake Assembly Set — 12-1/4" x 3-3/8", Self-Adjusting, 7-Bolt, 10K General Duty
Complete four-piece electric brake backing plate assembly set with two left-hand and two right-hand self-adjusting units for compatible 9,000–10,000 lb General Duty trailer axle applications.
Part Numbers: BK-10KE-01 / BK-10KE-02 Set of Four 12-1/4" x 3-3/8" / 7-Bolt
Overview
This R&P Carriages curated electric brake assembly set is built for service replacement on compatible 9,000–10,000 lb General Duty trailer axles using 12-1/4" x 3-3/8" electric brakes and a 7-bolt brake mounting flange. The set includes two left-hand and two right-hand self-adjusting backing plate assemblies, making it a practical full-axle-service solution for trailers needing brake assembly replacement on both sides of a tandem-style setup.
R&P Service Insight
Brake assembly replacement is often cleaner and more efficient than rebuilding worn plates piece by piece, especially when shoes, magnets, springs, and adjuster hardware have already seen heavy trailer service.
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Full Set Service: Includes two left-hand and two right-hand assemblies for consistent brake service across four wheel ends.
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Fitment First: Match the brake size, 7-bolt mounting flange, and left/right orientation before installation.
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10K Caution: Some 10K axles use 12-1/4" x 4" brake assemblies instead, so measurements must be verified before ordering.
R&P Knowledge Hub
Compatibility: Commonly used on 9,000–10,000 lb General Duty trailer axle applications with 12-1/4" x 3-3/8" electric brakes and a 7-bolt brake mounting flange.
Vehicle / System Fit: Trailer electric brake systems using left-hand and right-hand 12-1/4" x 3-3/8" self-adjusting backing plate assemblies.
Installation Notes: Verify brake diameter, shoe width, mounting flange pattern, wire routing, hub/drum compatibility, and side orientation before installation.
Performance Insight: Self-adjusting electric brake assemblies help maintain brake adjustment during normal use when installed and functioning correctly, reducing the need for frequent manual adjustment compared with standard manual-adjust brakes.
Brand & Fitment Note
Selling Brand: R&P Carriages curated replacement brake assembly set.
Application Reference: Dexter part numbers 023-450, 023-451, 023-450-00, and 023-451-00 are included as replacement reference numbers only for compatible applications where measurements, mounting points, brake size, and configuration match.
What This Means: This listing is for a replacement electric brake assembly set, not a guaranteed Dexter OEM-branded item unless specifically stated and verified.
Before Ordering: Verify brake size, axle rating, mounting flange, left/right orientation, drum compatibility, wire condition, and included components before installation.
R&P Repair Insight
Trailer brake fitment can look close from the outside, but the wrong shoe width or mounting pattern can stop the job immediately. Always confirm the assembly against the axle and drum before starting the install.
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Brake Size Check: Confirm your existing brakes are 12-1/4" diameter by 3-3/8" shoe width.
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Mounting Check: These assemblies are for 7-bolt brake flange applications and will not fit older 4-bolt brake mounts.
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Wiring Check: Brake magnets include two lead wires; polarity is not critical, but wiring condition and connections should be inspected during installation.
Features
Complete Four-Assembly Set
Includes two left-hand and two right-hand electric brake backing plate assemblies for a complete four-wheel brake service setup.
Self-Adjusting Design
Self-adjusting electric brake construction helps maintain proper brake adjustment during normal operation when installed correctly.
10K General Duty Application
Commonly used on 9,000–10,000 lb General Duty trailer axle applications using this brake size and mounting style.
7-Bolt Mounting Pattern
Designed for compatible 7-bolt brake mounting flanges. Not for older 4-bolt brake mount applications.
Specifications
| Specification | Detail |
| Part Numbers | BK-10KE-01 and BK-10KE-02 |
| Brand | R&P Carriages curated replacement set |
| Product Type | Electric brake backing plate assembly set |
| Brake Type | Electric, self-adjusting |
| Brake Size | 12-1/4" x 3-3/8" |
| Mounting Pattern | 7-bolt brake flange |
| Typical Axle Rating | Commonly used on 9,000–10,000 lb General Duty trailer axles |
| Handedness | Two left-hand and two right-hand assemblies |
| Hardware Note | Mounting bolts not included |
Fitment / Application
| Category | Details |
| Vehicle / System | Trailer electric brake system |
| Primary Fit | Compatible 9K–10K General Duty trailer axle applications using 12-1/4" x 3-3/8" brakes |
| Mounting Fit | 7-bolt brake mounting flange applications |
| Reference Numbers | Dexter 023-450, 023-451, 023-450-00, 023-451-00 application references where dimensions and configuration match |
| Notes | Some 10K axles use 12-1/4" x 4" brakes. Verify brake dimensions and mounting pattern before ordering. Will not fit older 4-bolt brake mounts. |
Included Components
| Quantity | Item |
| 2 | Left-hand self-adjusting electric brake backing plate assemblies |
| 2 | Right-hand self-adjusting electric brake backing plate assemblies |
| Included on assemblies | Brake magnets with two lead wires |
| Not included | Mounting bolts / mounting hardware |
Verify all measurements, brake size, shoe width, mounting flange pattern, left/right orientation, drum compatibility, axle specifications, wiring condition, and included components before installation. OEM or manufacturer part numbers in this listing are used as application reference numbers only unless the item is specifically identified as OEM and verified.
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