Wilwood Rear Red AERO4 and Electric Parking Brake Package, Drilled 14-Inch Rotors for Chevy 12-Bolt C-Clip Axles, 2.75-Inch Offset

Red AERO4 hydraulic calipers and red EPB parking units surround the drilled 14-inch rotor assemblies in this Chevy rear conversion. Spec-37 rings and separate aluminum hats complete the friction package, with vehicle hydraulic lines selected independently. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. Wilwood designs and manufactures disc brake systems for motorsport, specialized vehicles and street-performance applications. Calipers, brake rotors, master cylinders, valves, fittings and brake lines must be selected in relation to the other components in the finished brake system.

Technical Details

• Manufacturer part number — 140-16167-DR; supplied as one rear axle brake kit.
• Hydraulic service calipers — AERO4; 4 pistons per caliper; Forged Aluminium body; radial mounting; Stainless pistons.
• Caliper finish and port — Red Powder Coat; hydraulic inlet 1/8-27 NPT.
• Rotor mounting hats — Aluminum; Black E-Coat; hat offset 2.035 inches. This is a hat dimension, not the axle offset.
• Parking-brake package — Two separate electric parking calipers, control unit, switch with pigtail and universal wiring harness included; vehicle electrical connections require installation.
• Minimum nominal wheel diameter — 18 in; 457.2 mm; full spoke/barrel clearance must be checked using the installation drawing.
• Rotor material and surface — Spec-37 Iron; vented; SRP Drilled & Slotted; surface finish Black Electro Coat.
• Rear axle interface — 12 Bolt housing flange; 2.75 in; 69.85 mm axle offset. Measure the installed assembly.
• Rotor dimensions — 14.00 in; 355.6 mm outside diameter; 1.10 in; 27.94 mm thick.
• 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.
• Supplied service pads — BP-10 compound; verify suitability for the intended operating conditions.
• Hydraulic installation — Hydraulic lines and fittings are separate and must be selected for the vehicle; master cylinder not included; brake booster not included.

Fitment & Compatibility

Match the actual rear axle to the 12 Bolt diagram and 2.75-inch offset before disassembly. Verify the bearing arrangement, axle register and wheel-bolt pattern independently, including any changes made during a previous axle conversion. Use the full 18-inch minimum wheel envelope for both caliper positions. Confirm C-clip axle retention and end play; a C-clip eliminator or different housing flange requires its own fit assessment.

Any vehicle application in the fitment table below depends on the installed axle interface. Compare flange and bearing geometry, axle offset, center register and wheel hardware with the specified assembly. 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.

Parking actuation is electric through a supplied controller, switch with pigtail, universal harness and two motor-driven calipers. The installer must provide suitable vehicle power/ground and ignition/accessory connections and check lead routing to DS1353. These additional calipers are for parking hold, not an emergency stop function.

Contact PMB Performance if the installed hardware differs from the documented arrangement. More than 20 years of parts experience informs our fitment review; photographs and measured dimensions are particularly useful.

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.