Crane Axle Rear Unit Bearing Wilwood Lightweight Brake Kit - 4 Piston
CA01040N
The Crane Axle Rear Unit Bearing Wilwood 13.5" Lightweight Brake Kit is a complete bolt-on braking system designed by Crane Axle for use with the Crane Axle Rear Unit Bearing Adapter Cup Assembly (CA01033). The system combines Wilwood four-piston calipers, 13.5-inch vented rotors, machined aluminum rotor hats, and dedicated rear caliper brackets into one matched package.
Built for demanding off-road applications, this kit reduces unsprung and rotating weight while providing the braking leverage, heat management, and serviceability needed for race vehicles, rock crawlers, trail rigs, and custom axle builds. Every component is selected to work together with the Crane Axle rear unit bearing adapter system.
Includes:
- (2) Wilwood Forged Dynalite 4-Piston Calipers
- (1) Set of Wilwood Brake Pads
- (2) 13.5" Wilwood Vented Rotors
- (2) Crane Axle Machined Aluminum Brake Hats
- (2) Crane Axle Bolt-On Rear Brake Brackets
- Installation Hardware
- Safety-Wire Ready Rotor Bolts
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Crane Axle |
| Product Type | Rear Unit Bearing Brake Kit |
| Calipers | Wilwood Forged Dynalite 4-Piston |
| Total Piston Area | 4.80 sq. in. Per Caliper |
| Rotor Diameter | 13.5" |
| Rotor Type | Vented |
| Rotor Weight | 13.4 lbs Each |
| Caliper Weight | 3.4 lbs Each |
| Rotor Hat Material | Machined 6061 Aluminum |
| Caliper Bracket Material | Laser-Cut 3/8" Steel |
| Wheel Bolt Patterns | 8 on 6.5" and 8 on 170mm |
| Installation | Bolt-On |
| Rotor Hardware | Safety-Wire Ready Bolts |
Fitment
| Component | Compatibility |
|---|---|
| Required Adapter Assembly | Crane Axle Rear Unit Bearing Adapter Cup Assembly (CA01033) |
| Unit Bearing Application | 2005+ Super Duty Unit Bearing |
| Axle Position | Rear |
| Wheel Bolt Patterns | 8 on 6.5" and 8 on 170mm |
| Wheel Compatibility | Compatible with Double Beadlock Wheels |
| Additional Compatibility | Magnum Knuckle Unit Bearing Adapter Applications |
Fitment Notes
- Designed specifically to bolt to the Crane Axle Rear Unit Bearing Adapter Cup Assembly, part number CA01033.
- Intended for rear axle applications using 2005+ Super Duty unit bearings.
- Supports 8 on 6.5" and 8 on 170mm wheel bolt patterns when used with compatible hubs and wheels.
- Verify wheel diameter, barrel clearance, backspacing, rotor offset, and brake hose routing before installation.
- The required rear unit bearing adapter cup assembly is not listed as included with this brake kit.
FAQ
1. What axle assembly is this brake kit designed to fit?
This kit is designed specifically for the Crane Axle Rear Unit Bearing Adapter Cup Assembly, part number CA01033, in rear axle applications using 2005-and-newer Super Duty unit bearings.
2. Why use Wilwood four-piston calipers?
The forged four-piston calipers apply clamping force from both sides of the rotor. Their 4.80-square-inch total piston area provides strong, balanced braking with consistent modulation during demanding off-road use.
3. What advantage do the 13.5-inch vented rotors provide?
The larger rotor diameter increases braking leverage at the wheel, while the vented construction helps manage heat during repeated braking. This allows the system to generate greater stopping torque with controlled pedal effort.
4. How does the lightweight design affect vehicle performance?
Reducing rotor, caliper, and hat weight lowers unsprung and rotating mass. This can help the suspension respond more quickly to terrain changes while reducing the amount of mass that must be accelerated and slowed.
5. What should be verified before installation?
Confirm that the axle uses the correct Crane Axle adapter assembly and compatible Super Duty unit bearings. Wheel clearance, bolt pattern, rotor offset, brake hose routing, caliper orientation, and bleeder position should also be checked before final assembly.
