Wilwood Front Plain-Rotor Superlite 4R/ST Road-Race Kit, Ford Mustang 1994–2004 with Thermlock Pistons

Plain-face HD rotors identify this Mustang competition package for classes that limit rotor diameter and piston count. The four-piston Superlite 4R/ST calipers use Thermlock pistons and are supplied with high-temperature racing pads. Wilwood Engineering’s work covers the design and manufacture of disc brake systems for motorsport, street-performance and specialized applications. Bill Wood founded the company in 1977 in a business now based in Camarillo, California. Its calipers, master cylinders, brake rotors, brake lines, valves and fittings must be selected around the complete system.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-14114
• Kit classification: Front Brake Kits - Road Race
• Axle position: Front Kits
• Brake Type: Disc
• Selling unit: Sold as a kit.
• Recommended Use: Road Race kits contain high temperature racing pads. Extended low temperature use will cause premature rotor and pad wear.
• Rotor Outside Diameter: 12.88 in; 327.15 mm
• Rotor Thickness: 1.25 in; 31.75 mm
• Rotor Material: Spec-37 Iron
• Surface Type: Plain Face
• Rotor construction: Vented
• Bolt Circle Diameter: 5 x 4.5 in; 5 x 114.3 mm
• Catalog stud / mounting-hole reference: 0.580 in; 14.73 mm
• Rotor surface finish: Plain
• Hat material: Aluminum
• Hat finish: Black E-Coat
• Hat offset dimension: 0.410 in
• Minimum wheel guidance (clearance drawing required): 17 in; 431.8 mm
• Spindle Included: No
• Mounting Hardware Included: Yes
• Separate wheel hubs included: No
• Master Cylinder Included: No
• Brake Booster Included: No
• Brake Lines Included: Yes
• Pistons per service caliper: 4
• Service-caliper piston construction: Thermlock
• Service-caliper mount: Radial
• Caliper body construction: Forged aluminum
• Caliper Color: Anodize
• Caliper Finish: Type III Anodize
• Caliper Inlet Port Diameter: 1/8-27 NPT
• Caliper family: Superlite 4R/ST
• Pad compound: BP-35

Fitment & Compatibility

The plain-face HD rotor configuration uses four-piston Superlite 4R/ST calipers and 12.88-inch rotors for road-racing rules that allow that package. Check class regulations and the specified Mustang five-lug hub/spindle geometry. DS-1148 warns that stock Cobra/V8 GT hydroboost produces excessive pedal travel with this piston volume; vacuum assist or an appropriately sized twin-master balance-bar system is required. High-temperature BP-35 pads are unsuitable for extended cold use. The included front hose kit is 220-6458.

Listed models: Mustang. Use the fitment table below for the individual years, submodels and equipment conditions.

Wilwood product specifications · Installation instructions

PMB Performance brings over 20 years of experience to brake-component selection. Provide the actual hardware specification when the brake system has been modified.