Wilwood Rear GT-Slotted 14-Inch AERO4 Conversion with Red Calipers and EPB, Chevy 12-Bolt C-Clip Housing at 2.75-Inch Offset

The GT-slotted AERO4 rear conversion combines red four-piston service calipers with 14-inch two-piece rotors. Its additional electric parking units use the included switch and controller, while fit remains dependent on the measured Chevy 12-bolt axle arrangement. Wilwood Engineering has its base in Camarillo, California and was founded by Bill Wood in 1977. The company’s work covers disc brake systems and components for specialized vehicles, street-performance applications and motorsport. Calipers, brake rotors, master cylinders, valves, fittings and brake lines must be chosen with the rest of the braking system in mind.

Technical Details

• Manufacturer part number: 140-16167-R; supplied as one rear axle brake kit.
• Supplied service pads: BP-20 compound; verify suitability for the intended operating conditions.
• Cataloged rotor/hat mounting-hole pattern: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm bolt circle; cataloged stud-hole clearances 0.520 in; 13.21 mm. The existing hub or axle flange determines the vehicle wheel pattern and stud specification. These rotor/hat drillings do not convert that pattern.
• Mechanical contents: Separate wheel hubs are not included; mounting hardware supplied; spindles not included.
• Hydraulic installation: Hydraulic lines and fittings are separate and must be selected for the vehicle; master cylinder not included; brake booster not included.
• Rotor material and surface: Spec-37 Iron; vented; GT Slotted; surface finish Black Electro Coat.
• Caliper finish and port: Red Powder Coat; hydraulic inlet 1/8-27 NPT.
• Rear axle interface: 12 Bolt housing flange; 2.75 in; 69.85 mm axle offset. Measure the installed assembly.
• Rotor mounting hats: Aluminum; Black E-Coat; hat offset 2.035 inches. This is a hat dimension, not the axle offset.
• Rotor dimensions: 14.00 in; 355.6 mm outside diameter; 1.10 in; 27.94 mm thick.
• Hydraulic service calipers: AERO4; 4 pistons per caliper; Forged Aluminium body; radial mounting; Stainless pistons.
• Minimum nominal wheel diameter: 18 in; 457.2 mm; full spoke/barrel clearance must be checked using the installation drawing.
• Parking-brake package: Two separate electric parking calipers, control unit, switch with pigtail and universal wiring harness included; vehicle electrical connections require installation.

Fitment & Compatibility

This kit is selected for 12 Bolt geometry at 2.75 inches of axle offset. Wheel-stud pattern and register dimensions must match the supplied rotors or hats, and the parking motors and harness connectors need clearance throughout suspension travel. Compare the intended 18-inch or larger wheel with the installation drawing. Confirm C-clip axle retention and end play; a C-clip eliminator or different housing flange requires its own fit assessment.

Vehicle fitment in the table below remains conditional on axle identity. Measure the housing flange, bearing/retention arrangement, register and offset rather than relying on vehicle year. For Chevelle, 442, Beaumont, Camaro and Apollo vehicles, establish rear-axle fit independently of the front spindle configuration. Confirm the housing flange, axle retention and offset on the installed rear assembly.

Two dedicated motorized calipers provide parking hold separately from the hydraulic service calipers. The kit supplies their switch with pigtail, control unit and universal wiring harness. DS1353 covers the required 12V vehicle connections and component placement. The EPB is not an emergency stopping brake.

PMB Performance has more than 20 years of parts experience and can help assess the documented brake configuration. Provide the vehicle details together with clear mounting-area photographs and measurements.

Review the Installation instructions, Technical bulletin, EPB mounting and wiring instructions before selecting hardware or checking wheel clearance.

Manufacturer Warning

Applicable to brake pads only. WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.