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Dexter D44 (4400 lb) • Electric Brake Assemblies • Nev-R-Adjust Pair Dexter 10" x 2-1/4" Nev-R-Adjust Electric Brake Assemblies (LH + RH)
Newer D44 Special 4-Bolt Brake Flange (Non-Square Pattern) Part Number: K23-478-479 (Includes 1x K23-478-00 + 1x K23-479-00) Genuine Dexter Nev-R-Adjust self-adjusting electric brake backing plate assemblies for Dexter D44 (4400 lb) axles using the newer, special 4-bolt brake flange. This pair is matched LH + RH and is intended to fit Dexter drum numbers 8-407 and 8-498 only. K23-478-479 • LH + RH Pair Dexter D44 (4400 lb) Only 10" x 2-1/4" • Nev-R-Adjust Critical Fitment Alert — Dexter D44 (4400 lb) Dexter D44 (4400 lb) brake/drum components are a special application and are not broadly interchangeable. This kit is for the newer D44 special 4-bolt backing plate flange (non-square pattern) and is stated to fit Dexter drums 8-407 and 8-498 only. Not intended for Lippert 4400 lb axles or standard 10" brake flanges. Verify before ordering. Specifications Part Number K23-478-479 Brand Dexter Brake Size 10" x 2-1/4" Adjusting Nev-R-Adjust (Self-Adjusting) Application Dexter D44 (4400 lb) Quantity Pair (LH + RH) Fitment / Application Primary Fit Dexter D44 (4400 lb) with newer special 4-bolt flange Drums 8-407 & 8-498 only Verify By Flange measurement + drum number (do not rely on “4400 lb” alone) Not For Lippert 4400 lb axles / standard 10" brake flanges Orientation Includes both sides: 1 LH + 1 RH Top Features Self-Adjusting Helps maintain consistent brake adjustment in normal use Matched Pair Correct LH + RH assemblies for one axle service D44-Specific Mount Designed for the newer D44 non-square 4-bolt flange (verify measurements) 10" x 2-1/4" Common brake size, but special D44 fitment/drum match is required Quick Fitment Check (On-Center Flange Measurements) Confirm your backing plate flange matches these on-center dimensions:
- Top stud to opposite top stud: 2-7/8"
- Top stud to bottom stud: 3"
- Bottom stud to opposite stud: 3-1/4"
Also confirm your drum number is Dexter 8-407 or 8-498. Overview
This listing is for a pair of genuine Dexter Nev-R-Adjust electric brake assemblies: 1 left (K23-478-00) + 1 right (K23-479-00). These are intended for the Dexter D44 (4400 lb) axle family using the newer, special non-square 4-bolt brake flange and are stated to match Dexter drums 8-407 and 8-498 only. If you’re replacing brakes on a 4400 lb axle, do not assume interchange—verify flange pattern and drum number before purchase.
R&P Knowledge Hub
Compatibility: Dexter D44 (4400 lb) is a special axle family and has changed over the years. These brakes are for the newer D44 special 4-bolt backing plate flange and Dexter drums 8-407 / 8-498 only. If your flange pattern is square or your drum number is different, do not order until verified.
Vehicle / System Fit: Trailer axle electric brake system using Dexter D44-specific components.
Installation Notes: Verify left/right orientation, confirm flange on-center measurements, and confirm your drum number before disassembly. Recheck fasteners after initial road test per standard trailer brake service practice.
Pro Insight: “4400 lb axle” is not one universal standard—Dexter D44 and Lippert 4400 lb setups can use different hardware, bearings, drums, and brake mounting patterns. Matching by flange pattern + drum number is the safest way to get the correct parts.
R&P Service Insight
On Dexter D44 axles, the biggest issue we see is parts ordered by “weight rating” instead of verified identifiers. For 4400 lb Dexter, always match by flange pattern and drum number.
- Confirm the flange: Measure the 4-bolt backing plate pattern (non-square) using the on-center dimensions listed above.
- Confirm the drum: These are stated to fit Dexter 8-407 and 8-498 drums only.
- Confirm LH/RH: This kit includes both sides so you can service a full axle with matched components.
R&P Repair Insight
If your old brakes “almost line up” but not quite, that usually means you have a different D44 generation or a different axle brand. Stop and verify—forcing fitment can create unsafe braking and hardware issues.
- Flange pattern check: This is the special newer D44 4-bolt pattern, not a square 4-bolt flange.
- Drum number check: Confirm your drum is 8-407 or 8-498 before ordering.
- Brand check: Do not assume Dexter and Lippert 4400 lb parts interchange—match to your axle’s identifiers.
Features
- Dexter Nev-R-Adjust self-adjusting electric brakes
- Brake size: 10" x 2-1/4"
- Special newer D44 4-bolt backing plate mount (non-square pattern — verify)
- 4400 lb axle application (Dexter D44)
Best Use Practices
- Verify your axle family (Dexter D44 4400 lb) and confirm flange measurements before ordering.
- Confirm drum number is Dexter 8-407 or 8-498 prior to installation.
- Install LH on the left side and RH on the right side of the trailer (as viewed from the rear).
- After installation, perform a standard brake burnish procedure and recheck mounting fasteners after initial use.
Included Components Quantity Item 1 K23-478-00 Left (LH) Nev-R-Adjust brake backing plate assembly 1 K23-479-00 Right (RH) Nev-R-Adjust brake backing plate assembly 1 Instruction sheet 8 Mounting nuts (bolts stated as already pressed in) 4 Adjuster plugs Important Fitment Note: Dexter D44 (4400 lb) brake and drum components are a special application and have changed across model years. This listing is for the newer D44 special 4-bolt backing plate flange and is stated to fit Dexter drum numbers 8-407 and 8-498 only. Verify flange bolt pattern measurements, drum number, and left/right orientation before ordering. Do not assume interchange with Lippert 4400 lb axles or other 10" brake assemblies. Shop More 4400 lb / D44 Parts Dexter K23-478-479 K23-478-00 K23-479-00 10x2-1/4 Nev-R-Adjust electric brake assemblies backing plates D44 4400 lb axle newer 4 bolt brake flange non square 8-407 8-498 drum
