Match the part number, measurements and connection points that apply to your trailer.
| Hub Face | Measure hub face to hub face. |
|---|---|
| Spring Center | Measure mounting centers and confirm perch configuration. |
| Capacity | Match the required axle rating. |
| Brakes | Confirm brake type and flange configuration. |
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.
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.
| 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.
