Wilwood Rear Superlite 4R/ST Road-Race Kit for BMW E46 M3 (2001–2006), Thermlock Pistons, 12.88-Inch GT Rotors and Parking-Brake Deletion

The E46 M3 rear race package pairs four-piston Superlite 4R/ST calipers with dynamic 12.88-inch GT rotor assemblies. Thermlock pistons and BP-35 pads match the racing application, which eliminates the parking-brake hardware instead of retaining a mechanical parking system. Founded in 1977 by Bill Wood, Wilwood Engineering is now based in Camarillo, California, where its work centers on disc brake systems and components. Calipers, brake rotors, master cylinders, valves, fittings and brake lines serve motorsport, street-performance and specialized installations; selecting these parts requires considering the complete braking system.

Technical Details

• Manufacturer part number: 140-14980.
• Service caliper assembly: Superlite 4R; 4 pistons in each caliper; Thermlock pistons; Forged Aluminium body; Radial mounting.
• Supplied pad compound: BP-35.
• Hat wheel-stud clearance diameter: 0.610 in; 15.49 mm.
• Rotor mounting hat: aluminum; Black E-Coat; hat offset 1.193 in.
• Mechanical package contents: no separate hubs included; mounting hardware included: Yes; spindles included: No.
• Flexline specification: Line kit included (manufacturer): 220-14759 (20.00 in); Rear line-kit reference: 220-14759.
• Parking-brake provision: the original parking brake is eliminated; no mechanical parking function is supplied.
• Rotor dimensions: outside diameter 12.88 in; 327.15 mm; thickness 1.10 in; 27.94 mm.
• Rotor construction and friction surface: Spec-37 Iron; Vented; GT Slotted; surface finish: Plain.
• Caliper color, finish and hydraulic inlet: Anodize; Type III Anodize; inlet 1/8-27 NPT.
• Wheel bolt circle: 5 X 4.72 in; 5 X 119.89 mm.
• Nominal minimum wheel diameter: 17 in; 431.8 mm; verify full spoke and barrel clearance using the kit drawing.
• Rear flange interface: OEM; axle/flange offset 0.00 in; 0 mm (distinct from rotor-hat offset).
• Hydraulic package contents: brake lines included: Yes; master cylinder included: No; booster included: No.
• Race pad operating range: BP-35 pads are intended for high-temperature racing; extended low-temperature operation causes premature pad and rotor wear.
• Brake function and supply: Rear road-race brake kit; Disc braking; rear axle; Sold as a kit.

Fitment & Compatibility

Match the 2001–2006 BMW E46 M3 hub and rear suspension. DS1276 requires a dust-shield cut of approximately 7.70 inches diameter plus notches for bracket bolts, and specifies retention of the included rear hoses. Confirm the 17-inch wheel outline and the race car's complete brake balance.

Check the application-specific restrictions for M3. A shared model name does not replace the exact year and brake/suspension configuration. Use the fitment table below to confirm year, model, trim and brake or suspension options.

For a fitment check, give PMB Performance the vehicle details and the actual brake and suspension hardware. Our team has over 20 years of experience working through parts compatibility.

Check the Installation instructions for the full assembly and wheel-clearance requirements.

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.