Wilwood Front Superlite 4R/ST Race Brakes for Mustang 1994–2004, 12.88-Inch GT Rotors and Thermlock Pistons

The four-piston Superlite 4R/ST package is configured for Mustang road racing with 12.88-inch GT-slotted rotors. Thermlock pistons and high-temperature BP-35 pads distinguish it from a street-oriented front brake kit. From Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems and their components. Founded by Bill Wood in 1977, it serves street-performance, motorsport and specialized applications with master cylinders, calipers, brake rotors, valves, fittings and brake lines. All components must suit the requirements of the complete system.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-14113
• 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.
• 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
• Rotor Outside Diameter: 12.88 in; 327.15 mm
• Rotor Thickness: 1.25 in; 31.75 mm
• Rotor Material: Spec-37 Iron
• Surface Type: GT Slotted
• 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

Fitment & Compatibility

DS-1147 identifies this as the four-piston Superlite 4R/ST road-race kit, despite a mismatched 6R label on the component page. Use 1994–2004-type five-lug hubs and the required spindle geometry; earlier Fox-body conversions require 1994–1995 SN95 spindles. IMPORTANT: piston volume suits vacuum-assisted brakes or correctly sized twin-master balance-bar systems. Wilwood warns that Cobra/V8 GT hydroboost causes excessive pedal travel; resolve that configuration before relying on the table. BP-35 pads require high-temperature racing use; braided kit 220-6458 is included.

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

Wilwood product specifications · Installation instructions

PMB Performance has over 20 years of brake-parts experience. Send the installed component details if you need help checking this replacement.