Wilwood Street Performance AERO4 BB Rear P-Brake Kits, Drilled For 12 Bolt Chevy, C-Clip, 2.81 Offset, 14.00 Rotor

The Wilwood Street Performance AERO4 BB Rear P-Brake Kit is built for 12-bolt Chevy rear axles with factory C-clip axles, delivering a major upgrade from original disc brakes. At the heart of this system is a 14.00-inch vented rotor paired with a high-capacity, radial-mount Aerolite 4R four-piston caliper. Designed for compatibility with OE parking brake assemblies, it offers a powerful rear solution for drivers who have already upgraded their front brakes and want rear stopping power to match. Key specs include a 1.10-inch rotor thickness, 1.95-inch rotor hat offset, and compatibility with 0.50-inch wheel studs.

KEY SPECIFICATIONS

- Radial-mount Aerolite 4R four-piston calipers
- 14.00” vented rotors (available with GT slot or drilled/slotted finish)
- Integrated parking brake assembly (internal drum-in-hat design)
- Mounting brackets, shims, caliper brackets, and high-friction BP-20 brake pads
- All required fasteners, including rotor bolts (torque to 155 in-lb), caliper bracket bolts (180 in-lb), and caliper nuts (47 ft-lb)

INSTALLATION OVERVIEW

This system bolts directly to the axle housing but should be installed by experienced mechanics due to precision requirements. Begin by removing the stock brakes and verifying that the axle flange, stud size, and offset match the specs. Mount the caliper brackets and rotor assembly, aligning the hat to the 12 x 8.75” bolt circle. Use red Loctite® 271 on all hardware, torque each fastener to spec, and check parking brake cable routing for clearance. Complete the installation by bleeding the system and bedding in the pads per Wilwood’s recommendations.

FITMENT AND COMPATIBILITY

The kit fits with Chevy 12-bolt rear axles with C-clip retention, this kit supports axles featuring a 2.81” rotor offset, 1.95” hat offset, and 0.50” wheel studs. The system is fully compatible with OE master cylinder outputs and factory ABS bias. Check the wheel clearance before installation, especially if using 17” wheels or larger. Hydraulic lines, parking brake cables, and flexline fittings must be sourced separately. Always refer to the provided technical diagrams to confirm dimensional fit before assembly.