Trailer Brake Assembly / Electric Brake / 4,400 lb Axle
Dexter Electric Brake Assembly Left Hand 10 x 2-1/4 for 4,400 lb Axles New Style Flange K23-478-00
Left-hand electric brake assembly for trailer applications using a 10 inch x 2-1/4 inch brake size, FSA configuration, and new style flange on 4,400 lb axles. Verify axle capacity, side orientation, flange style, and brake dimensions before ordering.
Part Number: K23-478-00 10" x 2-1/4" Brake Size Left Hand / 4,400 lb Axle
Overview
This Dexter electric brake assembly is a replacement left-hand brake solution for trailer applications using a 10 inch x 2-1/4 inch brake size, FSA setup, and new style flange on listed 4,400 lb axles. It is built for buyers replacing a worn, damaged, or uneven braking side and helps restore proper braking function when the axle, mounting pattern, side orientation, and brake size match the existing setup.
R&P Service Insight
Trailer brake replacements go smoother when the technician confirms the side, brake size, and flange style before unbolting the old assembly. Left- and right-hand brake assemblies are not interchangeable, and flange style differences can stop an otherwise close match from fitting correctly.
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Side Orientation: This listing is for the left-hand brake assembly, commonly referenced as the driver's side.
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Brake Size Match: Confirm your existing brake measures 10 inches by 2-1/4 inches before ordering.
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Mounting Check: Verify the axle uses the new style flange and that the mounting points match your current setup.
R&P Knowledge Hub
Compatibility: Intended for trailer brake applications using a left-hand electric brake assembly with 10 inch x 2-1/4 inch sizing, FSA configuration, new style flange, and 4,400 lb axle rating where specifications match.
Vehicle / System Fit: Trailer axle brake system for compatible electric brake setups.
Installation Notes: Confirm left-hand orientation, brake size, axle rating, flange style, and mounting pattern before installation. Replace the opposite side only with the correct matching right-hand assembly.
Performance Insight: Proper brake size and side orientation matter for even shoe engagement, balanced braking, and correct backing plate fit at the axle flange.
Brand & Fitment Note
Selling Brand: Dexter
Application Reference: Any OEM or platform names in this listing describe compatibility, fitment target, or application style only where supported by verified dimensions, mounting points, and configuration details.
What This Means: This listing is for a Dexter electric brake assembly, not a guaranteed fit for every 4,400 lb trailer axle unless the brake size, flange style, side orientation, and mounting details match your current application.
Before Ordering: Verify measurements, mounting style, orientation, connector style, axle/brake/hub specifications, and included components before installation.
R&P Repair Insight
Common ordering mistakes on trailer brake assemblies usually come down to side confusion, axle rating assumptions, or flange mismatch. Before purchase, compare your current brake assembly label and backing plate dimensions to avoid delays and improper fit.
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Left vs. Right: Confirm you need the left-hand assembly before ordering, since the two sides are not the same part.
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Flange Verification: New style flange fitment should be checked against your axle mounting surface and existing brake assembly.
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Size Confirmation: Measure the brake size and confirm the axle is a 4,400 lb application using this assembly style.
Features
Left-Hand Electric Brake Assembly
Built as a left-hand electric brake assembly for compatible trailer axle brake systems.
10" x 2-1/4" Brake Size
Designed for applications using a 10 inch diameter by 2-1/4 inch wide brake format.
Fits 4,400 lb Axle Applications
Intended for listed 4,400 lb axle brake applications where the remaining fitment details match.
New Style Flange Configuration
Made for setups using the new style flange, helping match the correct backing plate mount for compatible axles.
Specifications
| Specification | Detail |
| Part Number | K23-478-00 |
| Brand | Dexter |
| Product Type | Electric brake assembly |
| Application | Trailer axle brake system |
| Material / Finish | Not specified |
| Key Measurement | 10" x 2-1/4" |
| Fitment | Left-hand electric brake for compatible 4,400 lb axle applications |
| Configuration | FSA |
| Flange Style | New style flange |
Fitment / Application
| Category | Details |
| Vehicle / System | Trailer electric brake system |
| Primary Fit | 4,400 lb trailer axles using a left-hand 10" x 2-1/4" electric brake assembly with FSA and new style flange |
| Secondary Fit | Replacement use where existing brake dimensions, side orientation, and flange configuration match this assembly |
| Notes | Verify axle rating, left-hand orientation, brake dimensions, and new style flange details before ordering or installation. |
Included Components
| Quantity | Item |
| 1 | Left-hand electric brake assembly |
Verify all measurements, axle rating, side orientation, flange style, mounting points, wiring connection details, and included components before installation. This listing uses application language only and should be matched to your existing brake setup before purchase.
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