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Product details
The Purple friction material in this GP320 set is intended for sprint-car brake systems, including aluminum rotor applications. Its 0.44-inch pad profile is larger than the GP200 form, making exact caliper identification essential despite the shared compound color. Calipers, brake rotors, master cylinders, valves, fittings and brake lines form Wilwood Engineering’s disc brake range. Bill Wood founded the Camarillo, California company in 1977; it designs and manufactures systems for motorsport, street-performance and specialized applications. Matching the component to the rest of the brake package is fundamental to selection.
Technical Details
- Manufacturer part number: 150-13335K
- Friction compound: Purple
- Package quantity: 4 pads
- Pad thickness: .44 inch
- Published pad area: 3.65 square inches
- Published pad volume: 1.03 cubic inches
- Rotor compatibility: Aluminum, Steel, Stainless Steel
- Bedding status: not pre-bedded; follow Wilwood bedding procedure
- Pad profile: 6211
Purple is a composite metallic racing compound developed for high-temperature durability on aluminum and other low-conductivity alloy rotors. Wilwood lists sprint-car use with aluminum, steel and stainless-steel rotor compatibility. Select it for the specified racing rotor and heat conditions, not merely because another pad has the same purple compound name.
Fitment & Compatibility
Wilwood’s compatible-caliper list names GP320. Verify the required new-pad thickness alongside the plate’s contact and mounting surfaces. Rotor material and operating temperature must also match the friction compound; a shape match alone is insufficient.
Reference: Wilwood product specifications and compound guidance. Manufacturer profile illustration.
Need to resolve a pad-shape or compound question? PMB Performance draws on more than 20 years of experience; provide the brake assembly details so we can help assess the correct match.
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.
