12" x 3.5" Electric Trailer Brake – 8,000 lb – 4 Bolt Mount – Left Hand
Part Number: 4739-L
Left-hand (driver side) 12" x 3.5" electric brake assembly for 8,000 lb trailer axles using a 4-bolt backing plate mount. Features a cast backing plate and auto-adjusting brake design. All internal brake components are pre-assembled on the backing plate for direct replacement.
R&P Knowledge Hub
This brake assembly is commonly used on imported 8K axles and is not used on standard Dexter 8,000 lb axles. It has been found on certain Quality Trailer, H&H, J&J, Lippert, and similar configurations.
Left-hand (LH) brake assemblies mount on the driver side of the trailer axle. Always confirm brake size (12" x 3.5") and 4-bolt flange pattern before ordering.
Features
- 12" x 3.5" electric brake configuration
- 8,000 lb axle rating
- 4-bolt backing plate mount
- Cast backing plate
- Auto-adjusting brake design
- Pre-assembled for direct replacement
Specifications
| Specification | Detail |
|---|---|
| Brake Size | 12" x 3.5" |
| Axle Rating | 8,000 lb |
| Mounting Pattern | 4 Bolt |
| Orientation | Left Hand (Driver Side) |
| Adjustment Type | Automatic |
Verify brake size, bolt pattern, and axle compatibility before installation.
Rockwell 12" x 3.5" Electric Brake Family – 8,000 lb – 4 Bolt Mount
✓ Left Hand (Driver Side)
4739-L
4739-L
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Right Hand (Passenger Side)
4739-R
4739-R
12" x 3.5" – 8K – 4 Bolt
Pair – LH + RH
4739-L + 4739-R
4739-L + 4739-R
Complete set for one axle
