Wilwood AERO4 Dust Seal Caliper, Black, 1.12-Inch Bores and 1.98-Sq.-In. Area

Choose this Wilwood AERO4 Dust Seal when the installation calls for 1.12-inch pistons and 1.10-inch rotor width. The black 4-piston body uses a 7.09-inch radial pattern; check its complete geometry before substituting another caliper. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, Wilwood designs and manufactures disc brake systems and parts for motorsport, street-performance and specialized applications, from calipers and rotors to master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-14440-BK
• Mounting: universal side configuration; Radial; 7.09-inch centers; 0.45-inch mounting holes
• Mount height: 2.09 inches
• Rotor width: 1.10-inch nominal; 1.00–1.10-inch permitted range
• Rotor diameter range: 12.19–15.00 inches
• Pad shape: Wilwood type 6617; compound selected separately
• Piston arrangement: 4 pistons; 1.12-inch bores; stainless steel
• Hydraulic piston area: 1.98 square inches, as specified by Wilwood
• Body and finish: Forged aluminum; Black Powder Coat
• Fluid inlet: 1/8-27 NPT
• Dust boots: Yes
• Component: Wilwood AERO4 Dust Seal; one caliper

Fitment & Compatibility

Use the caliper drawing to compare the mounting holes and body envelope with the installed brake assembly. Confirm piston sizes and brake balance before changing to a different bore configuration.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

AERO4-DS calipers use four stainless pistons with external dust wipers and a 7.09-inch radial mounting pattern. Internal fluid transfer avoids an external crossover tube, leaving rotor centering and wheel clearance to the installation design.

For a brake system assembled from individual components, PMB Performance brings over 20 years of experience. Contact us with the rotor, caliper and bracket information so we can help check the combination.