Wilwood Street Performance BB Rear P-Brake Kits, Drilled, Red For Big Ford, 2.36 Offset, 14.00 Rotor

The Wilwood Street Performance AERO4 Big Brake Rear Axle Kit (Part #140-10944-DR) boosts rear braking power for vehicles running Big Ford new-style axles with a 2.36" offset. It’s designed to work with existing parking brake assemblies and matches the stopping needs of high-performance cars running larger front brakes, big wheels, or heavier suspensions. Key technical improvements include four-piston Aerolite 4R callipers for stronger clamping force, oversized 14" vented rotors for greater heat dissipation and durability, and BP-20 high-friction pads for better braking response. Internal registration adapters maintain precise rotor alignment, while included shims and spacers enable fine adjustment of calliper position to ensure even pad wear and smooth operation. This engineering focus yields dependable, enhanced brake performance for custom and high-performance applications while maintaining compatibility with original equipment (OE) master cylinders and ABS systems.

KEY SPECIFICATIONS

- Rotor Diameter: 14.00" (355.6 mm), vented
- Rotor Thickness: 1.10"
- Rotor Bolt Pattern: 12 x 8.75"
- Caliper: Aerolite 4R, 4-piston radial mount
- Pads: BP-20 compound included
- Stud Size: 0.50" diameter (hats drilled for 0.50")
- Max Axle Flange Diameter: 6.11" with .050" chamfer
- Rotor Offset: 2.36"
- Parking Brake: Compatible with OE mechanism, hardware not included
- Brake Hose/Fittings: Not included (1/8-27 NPT caliper fitting required)

INSTALLATION DETAILS

Installers should have experience with disc brake conversions. Steps include removing the original brake parts and cleaning the mount points, verifying axle specifications (flange size, offset, and stud size), assembling the rotors and hats with the provided hardware and threadlocker, and then bolting up the calliper brackets and spacers for accurate alignment. The system uses step-by-step shimming to centre callipers and pads on the rotors. The parking brake cable routing must avoid tight bends and be securely attached to the chassis. Brake lines and adapters must be sourced separately and routed for clear suspension movement. Follow a detailed bleeding sequence for the hydraulics, adjust the parking brake, and use Wilwood’s bedding instructions for new pads and rotors. All fasteners, moving parts, and clearances should be checked before driving.

FACTORY FIT NOTES

- Fits Big Ford “new style” rear axles with 2.36" offset and 0.50" diameter wheel studs.
- Designed to use the OE parking brake; cables/hardware must be sourced as needed.
- Requires checking wheel clearance for 14" rotors and callipers.
- Axle flanges over 6.11" diameter may not fit; studs other than 0.50" may need hats re-drilled or changed.
- Possible need to adjust or move shocks for calliper clearance.
- Installer must verify axle flange, bolt pattern, stud size, and offset for correct fit.
- Brake hoses and adapters for hydraulic connections must be sourced separately and checked for compatibility to ensure a proper fit.