Wilwood Drilled Front Brake Conversion for Selected BMW 323i/325i/330i/328i/335i/128i/135i, Black Six-Piston AERO6 Calipers and 14-Inch Rotors

This drilled-rotor version combines black six-piston AERO6 calipers with Spec-37 iron friction rings and dynamic-mount aluminum hats. It converts the matched BMW front brakes while retaining the factory hub, master-cylinder output and ABS configuration specified by Wilwood. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and manufactures disc brake systems and components for motorsport, street-performance and specialized applications. Its range spans calipers, brake rotors, master cylinders, valves, fittings and brake lines, with each component chosen to suit the complete brake system.

Technical Details

• Wheel interface: 5 x 4.72 in; 5 x 119.89 mm. Rotor/hat wheel-stud clearance: 0.520 in; 13.21 mm.
• Nominal minimum wheel diameter: 18 in; 457.2 mm. Verify the full wheel-clearance drawing; diameter alone does not establish barrel or spoke clearance.

• Rotor: 14.00 in; 355.6 mm outside diameter; 1.25 in; 31.75 mm thickness. Material: Spec-37 Iron. Construction: Vented. Friction-face style: SRP Drilled & Slotted.
• Rotor-hat material: Aluminum. Hat offset: 1.550 inches; this hat dimension is separate from axle offset.
• Rotor surface finish: Black Electro Coat.

• Manufacturer: Wilwood; manufacturer part number: 140-13582-D. Supplied quantity: Sold as a kit.
• Application category: Front Brake Kits - Street Performance. Axle/spindle category: Front Kits. Brake function: Disc.
• Separate wheel hubs included: No. Retain only the hub arrangement specified for this kit.
• Mounting hardware included: Yes. Spindles included: No. Master cylinder included: No. Brake booster included: No.
• Flexible brake lines included: Yes; matched line kit 220-13646, 22.00 inches nominal length.

• Calipers: 6 stainless pistons per caliper; radial mounting; forged aluminium bodies. Color: Black. Finish: Black Powder Coat. Inlet thread: 1/8-27 NPT.
• Caliper family: AERO6. Brake-pad compound: BP-10.

Fitment & Compatibility

Match the model, year, sedan/coupe/convertible/wagon designation and drivetrain in the table. Do not assume xi or an unlisted body is covered by a shared model badge. The kit includes its front flexlines; use DS1037 to verify hat seating, hose routing and 18-inch wheel space.

Manufacturer Documents

• Wilwood product specifications and wheel-clearance drawing
• Installation instructions

For help matching the conversion to your existing hardware, contact PMB Performance with the vehicle details and the relevant measurements. Our parts and fitment work draws on over 20 years of experience.