Crane Axle Front Unit Bearing Wilwood 6 Piston Lightweight Brake Kit
CA01039N6P
The Crane Axle Front Unit Bearing Wilwood 6-Piston Lightweight Brake Kit is designed for high-performance off-road and fabricated chassis applications using 2005+ Ford Super Duty unit bearings. Built around Wilwood forged billet 6-piston calipers and large-diameter 13.5" vented rotors, this system drastically improves stopping power while reducing unsprung weight and rotating mass compared to heavier OEM-style cast brake assemblies.
Engineered specifically for Crane Axle Magnum Knuckle and Super Duty unit bearing adapter systems, this bolt-on package combines lightweight 6061-T6 aluminum rotor hats with precision laser-cut caliper brackets for accurate alignment and improved serviceability. The reduction in rotating mass improves suspension response and steering feel, while the 6-piston clamping force delivers the severe-duty braking torque needed for large tires, high-horsepower drivetrains, and aggressive competition off-road use.
Includes:
- (2) Wilwood 6-Piston Forged Billet Calipers with Brake Pads
- (2) Wilwood 13.5" Vented Rotors
- (2) Crane Axle Machined 6061-T6 Aluminum Rotor Hats
- (2) Crane Axle Bolt-On Front Brake Brackets
- Safety Wire Ready Rotor Bolts
- All Required Installation Hardware
Specifications
| Specification | Details |
|---|---|
| Caliper Type | Wilwood Forged Billet 6-Piston |
| Caliper Material | Forged Billet Aluminum |
| Rotor Diameter & Style | 13.5" Wilwood Vented Steel |
| Rotor Hat Construction | Precision-Machined 6061-T6 Aluminum |
| Brake Bracket Material | Laser-Cut High-Strength Steel |
| Wheel Bolt Pattern Compatibility | Fits 8 on 6.5" & 8 on 170mm |
| Hardware Feature | Safety-Wire Ready Rotor Bolts Included |
| Application Design | Bolt-On for 2005+ Ford Super Duty Unit Bearings & Crane Adapters |
| Country of Origin | Manufactured in USA |
Fitment
Designed for custom off-road steering front axles utilizing 2005+ Ford Super Duty unit bearings paired with Crane Axle adapters.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Ford | F-250 Super Duty (Unit Bearing Donor) | 2005+ | Front Unit Bearing Axle |
| Ford | F-350 Super Duty (Unit Bearing Donor) | 2005+ | Front Unit Bearing Axle |
| Custom Steer Axle | Crane Magnum Knuckle Applications | Custom Build | Front Unit Bearing Axle |
| Custom Steer Axle | Tube Chassis & Custom Buggy Builds | Custom Build | Front Unit Bearing Axle |
Fitment Notes
- Designed specifically to bolt onto Crane Axle Magnum Knuckle systems and Crane Axle 2005+ Super Duty unit bearing adapters.
- Dual-drilled rotor hats are compatible with both standard off-road 8x6.5" and modern Super Duty 8x170mm wheel bolt patterns.
- Intended for high-performance off-road, rock racing, and fabricated chassis applications.
- Always verify wheel backspacing, beadlock inner barrel clearance, and caliper profile dimensions prior to final assembly.
FAQ
1. What is the performance advantage of a 6-piston caliper over a 4-piston caliper?
A 6-piston caliper provides a larger total piston clamping area and distributes brake pressure across a longer, more aggressive brake pad pad track. This results in superior clamping torque, more even pad wear, and exceptional pedal modulation—making it the ideal upgrade for heavier Ultra4 cars, rock bouncers, and trail rigs running 40-inch and larger tires.
2. Why is reducing unsprung weight so important for off-road suspension performance?
Unsprung weight refers to any vehicle component not supported by the springs (such as axles, wheels, tires, and brakes). By replacing heavy OEM cast-iron rotors and sliding calipers with lightweight Wilwood billet aluminum calipers and 6061-T6 aluminum rotor hats, you drastically reduce rotating inertia and unsprung mass. This allows your shocks to cycle and control wheel movement much faster over whoops, rocks, and rough terrain.
3. Will this kit bolt directly onto a stock, unmodified Ford Super Duty truck?
No. While this brake kit centers around 2005+ Ford Super Duty unit bearing geometry, it is engineered specifically as a lightweight performance upgrade for custom steering axles equipped with Crane Axle Magnum Knuckles and Crane Axle Unit Bearing Adapters on custom-built off-road chassis.
4. How do the 13.5" vented rotors handle high-temperature brake fade?
The 13.5-inch diameter increases mechanical braking leverage, requiring less pedal effort to generate stopping power. Combined with directional internal cooling vanes, the rotor dissipates severe heat buildup caused by repeated high-speed braking in desert endurance races or steep rock-crawling descents.
5. What wheel sizes and bolt patterns work with this 6-piston brake system?
The machined aluminum rotor hats are dual-drilled to accommodate both 8 on 6.5" and 8 on 170mm wheel bolt patterns. Due to the larger profile of the 6-piston billet calipers and 13.5" rotors, we recommend running 17-inch or larger wheels and verifying inner barrel clearance when using double beadlock wheels.
