Wilwood Front GT Rotor Brake Conversion, Red AERO6 Calipers, BMW 325Ci/325i/330Ci/330i/320i/323Ci/328Ci/323i/323is/328i/328is (1999–2006)

GT slotted 14-inch rotors and BP-20 pads are paired with red six-piston AERO6 calipers in this Wilwood BMW conversion. Separate hats carry the 72-vane rings on the existing front hubs. The package must be selected by the E46 front hardware and the individual body/year application rather than a broad 3-Series designation. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines. Its product range serves motorsport, street-performance, and specialized applications, with individual components selected to match the requirements of the complete brake system.

Technical Details

• Manufacturer part number: 140-11974-R
• Type: AERO6 Big Brake Front Brake Kit
• Calipers: AERO6; 6 pistons per caliper; Red Powder Coat; radial mounting.
• Piston bores: 1.62, 1.12, 1.12 inches; Stainless pistons. Included pad compound: BP-20.
• Rotors: 14.00-inch diameter × 1.25-inch width; GT Slotted; Spec-37 Iron; Black Electro Coat finish.
• Wheel bolt circles: 5 x 4.72 inches.
• Included: paired calipers, pads, rotors, brackets and assembly hardware, rotor hats.
• Hydraulic flex lines are separate. Master cylinder, booster and spindles are not included; retain or select suitable matching components.
• Conditional minimum wheel diameter: 18 inches. Verify the complete clearance drawing for barrel and spoke offset before purchase.

Fitment & Compatibility

Read DS826 for the 1999 sedan-only requirement, later body coverage and applicable xi exclusions. Resolve any 323is/328is or M-marked application with the actual chassis and Wilwood before installation; these rows do not independently prove E36 or M3 fit. Check the entire 18-inch conditional wheel section behind the spokes. The conversion also requires separately chosen brake hoses, suitable hydraulic balance and sound retained hubs. Confirm all clearances and align the rotors before bedding the pads.

Check the individual year, model, submodel and equipment conditions in the fitment table below before ordering.

Wilwood installation documents: Installation instructions.

PMB Performance has over 20 years of brake-system experience. Contact us with your vehicle, axle or spindle details and wheel measurements for fitment help.

California Proposition 65 warning, 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.