At a Glance
- >12" by 3-3/8" electric brake assemblies
- >8,000 lb axle rating
- >4-bolt backing plate mount
- >Cast backing plate construction
- >Auto-adjusting brake design
- Brand: Rockwell
- SKU: 4739-L+4739-R
Before You Order
Match the part number, measurements and connection points that apply to your trailer.
Fitment Check
| 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. |
Product Details
Left and Right - 12" by 3-3/8" Electric Trailer Brake – 8,000 lb – 4 Bolt Mount
Part Numbers: 4739-L + 4739-R
Complete brake set for one 8,000 lb trailer axle. Includes one left-hand (driver side) and one right-hand (passenger side) 12" by 3-3/8" electric brake assembly with 4-bolt backing plate mount. Designed for imported-style 8K axles using a cast 4-hole brake flange configuration.
R&P Knowledge Hub
This brake configuration is not used on standard Dexter 8,000 lb axles. It is commonly found on imported axle assemblies used by certain Quality Trailer, H&H, J&J, Lippert, and similar manufacturers.
Brake assemblies are side-specific. This listing includes both sides to service one complete axle. Confirm brake size (12" by 3-3/8") and 4-bolt mounting pattern before ordering.
Features
- 12" by 3-3/8" electric brake assemblies
- 8,000 lb axle rating
- 4-bolt backing plate mount
- Cast backing plate construction
- Auto-adjusting brake design
- Pre-assembled for direct replacement
- Includes one LH and one RH assembly
Specifications
| Specification | Detail |
|---|---|
| Brake Size | 12" by 3-3/8" |
| Axle Rating | 8,000 lb |
| Mounting Pattern | 4 Bolt |
| Orientation | Includes Left (LH) and Right (RH) |
| Adjustment Type | Automatic |
Verify brake size and mounting configuration before installation.
Left Hand (Driver Side)
4739-L
4739-L
12" x 3.5" – 8K – 4 Bolt
Pair – LH + RH
4739-L + 4739-R
4739-L + 4739-R
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Right Hand (Passenger Side)
4739-R
4739-R
12" x 3.5" – 8K – 4 Bolt
