Match the part number, measurements and connection points that apply to your trailer.
| Part Number | Match the number stamped on the original bearing or seal. |
|---|---|
| Dimensions | Measure the mating surfaces when a number is unavailable. |
| Hub / Axle | Use capacity as context, not as the only fitment check. |
Complete hydraulic disc brake kit designed for 3,500 lb cargo and 3,700 lb boat trailer axles. Common replacement for UFP DB-35 configurations and widely used on boat trailers including Ranger, EZ Loader, and similar UFP/Vault style hub systems.
This kit includes rotor/hub assemblies, calipers, bearings, seals, dust caps, mounting hardware, and lug nuts for one complete axle. Designed to provide corrosion resistance and improved braking performance in marine and high-moisture environments.
Hydraulic disc systems on 3.5K axles offer improved heat dissipation and corrosion resistance compared to traditional drum brakes, making them common in marine applications. The rotor/hub assembly houses the bearing sets and seal, while the caliper applies hydraulic pressure directly to the rotor surface.
Proper identification of spindle size, bearing numbers (L68149 / L44649), seal diameter, and bolt pattern is critical. Many 3.5K axles look similar but use different seal dimensions. Always confirm spindle measurements before ordering.
| Specification | Details |
| Axle Rating | 3,500 lb Cargo / 3,700 lb Boat Trailer |
| Brake Type | Hydraulic Disc |
| Rotor Diameter | 10" |
| Minimum Rotor Thickness | 17MM (Marked) |
| Bolt Pattern | 5 on 4.5" |
| Inner Bearing | L68149 (1-3/8") |
| Outer Bearing | L44649 (1-1/16") |
| Seal Options Included | 32372 (2.56" x 1.68") / 10-19 (2.56" x 1.72") |
| Lug Nuts | 1/2"-20 (10 Included) |
Verify specifications before installation.
