Mon–Fri 9:00 AM–5:00 PM CST  |  Sat 9:00 AM–3:00 PM  |  Sun Closed  |  Call or Text 815-357-3292  •  Free Shipping on Most Orders  •  Real-Time Rates When Applicable  •  Upgrade Delivery at Checkout  |  Ships Next Business Day Monday–Friday  |  We install what we sell — parts backed by real trailer service.  |  Need fitment help? Send us your trailer part photos and we will help you match it right.  |  How are we doing? Leave a review → Mon–Fri 9:00 AM–5:00 PM CST  |  Sat 9:00 AM–3:00 PM  |  Sun Closed  |  Call or Text 815-357-3292  •  Free Shipping on Most Orders  •  Real-Time Rates When Applicable  •  Upgrade Delivery at Checkout  |  Ships Next Business Day Monday–Friday  |  We install what we sell — parts backed by real trailer service.  |  Need fitment help? Send us your trailer part photos and we will help you match it right.  |  How are we doing? Leave a review →
FAMILY OWNED & OPERATED

Pair- 12.25" x 4" Brake Back Plate Trailer 10K HD Axle Dexter Electric 9-27 drum (23-438-439)

$817.40
Most items ship free — select items ship for $6.39
Only 1 left
Not Sure It Fits? Ask a Pro
R & P Carriages

Pair – 12-1/4" x 4" 10K HD Electric Brakes – Dexter Nev-R-Adjust – Both Sides

PN: 23-438-439   |   MPN: 023-438-00 & 023-439-00

Genuine Dexter 12-1/4" x 4" Heavy Duty electric brake assemblies with forward self-adjusting Nev-R-Adjust feature. This listing includes both left-hand and right-hand loaded backing plates for one complete axle.

Designed for use with 12-1/4" x 4" drums commonly marked “9-27” and 10,000 lb heavy-duty axle configurations. These are complete brake assemblies, pre-assembled and ready to mount to an existing 7-bolt brake flange.

R&P Knowledge Hub

12-1/4" x 4" HD electric brakes are not interchangeable with 12-1/4" x 3-3/8" General Duty brake systems. The 4" shoe width provides increased friction surface and heat capacity for 10K heavy-duty axles.

Nev-R-Adjust systems automatically maintain proper shoe-to-drum clearance during forward stops. As the shoes wear, the internal adjuster advances to compensate, reducing manual adjustment intervals and maintaining consistent braking performance.

Features

  • Both sides included (LH & RH)
  • 12-1/4" x 4" heavy-duty electric drum brake assemblies
  • Forward self-adjusting Nev-R-Adjust feature
  • 7-hole flange mounting pattern (hardware not included)
  • 5,000 lb capacity per brake (10,000 lb per pair)
  • Compatible with drums commonly marked “9-27”
  • Made in USA

Specifications

Specification Detail
Brake Size 12-1/4" x 4"
Brake Type Electric Drum – Nev-R-Adjust
Mounting Pattern 7-Bolt Flange
Capacity (Each) 5,000 lb
Capacity (Per Pair) 10,000 lb
Drum Compatibility 12-1/4" x 4" Drum (Typically Marked “9-27”)
Country of Origin USA

Verify specifications before installation.

23-438-439 023-438-00 023-439-00 Dexter 12.25 x 4 electric brakes 10K HD Nev-R-Adjust 9-27 drum
R & P Carriages Baseball Field Advertising Sign