Pair 12-1/4" x 3-3/8" Hydraulic Brake Assemblies – 8K – Left & Right
Part Number: 77-1208H-1P
Complete pair of hydraulic brake backing plate assemblies for 8,000 lb axle applications. Includes one left-hand (driver side) and one right-hand (passenger side) assembly.
Kit Includes
| Component | Quantity |
| Hydraulic Backing Plate – Left (Driver Side) | 1 |
| Hydraulic Backing Plate – Right (Passenger Side) | 1 |
R&P Knowledge Hub
12-1/4" x 3-3/8" hydraulic brake assemblies are commonly used on 8,000 lb trailer axles. Duo-servo designs provide braking force in both forward and reverse motion. These assemblies mount to a standard 4-hole brake flange and require correct flange spacing for proper fitment. Always verify flange dimensions and axle capacity before ordering.
Specifications
| Specification | Detail |
| Brake Size | 12-1/4" x 3-3/8" |
| Brake Type | Hydraulic, Self-Adjusting Duo-Servo |
| Application | Forward Self-Adjusting |
| Axle Rating | Up to 8,000 lb |
| Brake Flange | 4-Bolt Mount |
| Flange Spacing (Top to Bottom) | 3-5/8" |
| Flange Spacing (Left to Right) | 3-7/16" |
| Dexter Cross Reference – Left | K23-402-00 / 23-402 / 023-402-00 |
| Dexter Cross Reference – Right | K23-403-00 / 23-403 / 023-403-00 |
Verify specifications before installation.