Hawk HB521F.800 HPS Street Brake Pads for AP Racing CP8250 Wilwood Superlite

Vehicle Fitment

This is a universal racing caliper brake pad. It is not vehicle-specific and is not sold for use with OEM stock calipers. Fitment is determined by caliper model. Compatible racing calipers include:

• AP Racing CP8250 / CP8250D41
• AP Racing (Essex) CP8350-24S4L / CP8350-25S4L / CP8350-26S4L / CP8350-27S4L / CP8350-32S4L / CP8350-33S4L
• CompBrake Pro Race One
• StopTech ST-43 / C43
• Wilwood Narrow Superlite 4 / Narrow Superlite 6 (plate shape 7420)
• Wilwood Superlite Bridge Bolt
• Wilwood Superlite 4R / Superlite 6R (plate shape 7420)
• Wilwood Superlite ST
• Wilwood Forged Superlite Internal

Fitment Notes

• This pad is universal for racing calipers - it is not designed for OEM stock brake calipers and has no vehicle-specific fitment.
• Pad thickness: 0.800 in. This corresponds to Wilwood plate shape 7420 and AP Racing CP8250D41. The same pad shape is also available in 0.650 in. thickness (Wilwood plate shape 7416); verify your specific caliper's required pad thickness before ordering.
• Some Wilwood Superlite calipers use the bridge bolt retention method, which requires a center mounting hole in the pad. Depending on the specific caliper configuration, the center hole may need to be drilled - verify your caliper's pad retention method before installation.
• Not compatible with carbon ceramic rotors. For use with iron/metal rotors only.
• HPS is Hawk's benchmark high-performance street compound, designed for daily-driven vehicles and dual-use street/autocross applications. It operates reliably from cold ambient temperature through 700°F, making it the practical street pad choice for big brake kit owners who drive their cars daily.
• Sold as a set of two pads (one caliper). For a full brake system upgrade, one set per caliper is required.

Features

• HPS (High Performance Street) Ferro-Carbon compound - Hawk's benchmark street performance formula for the AP Racing CP8250/CP8250D41/CP8350, StopTech ST-43, and Wilwood Superlite family at 0.800 in. pad thickness, delivering 20-40% more stopping power than OEM pads while maintaining the low dust, quiet operation, and rotor compatibility required for daily-driven performance cars equipped with aftermarket brake systems.
• Effective from dead cold through spirited use - Operates from ambient temperature through 700°F (optimal: 100-500°F), providing improved stopping power from the very first application of the day - a key advantage for street-driven big brake kit installations that encounter widely varying brake temperatures throughout daily driving and performance use.
• 20-40% more stopping power than OEM - The HPS compound's higher coefficient of friction delivers noticeably stronger brake torque from these aftermarket racing calipers, translating their increased clamping force into shorter, more confident stopping distances compared to standard replacement compounds.
• Excellent fade resistance for a street compound - Withstands the sustained heat generated by aggressive street driving, canyon runs, autocross events, and light track use without the thermal fade that limits standard street replacement compounds in these higher-demand applications.
• Gentle on rotors with extended pad life - The Ferro-Carbon formulation minimizes abrasive wear on rotor surfaces, extending service intervals for both the friction material and the premium-cost rotors typically paired with AP Racing, StopTech, and Wilwood calipers in big brake kit installations.
• Low dust output - Produces significantly less brake dust than many performance compounds, keeping the wheels of big brake kit-equipped vehicles cleaner without sacrificing stopping performance over stock.
• Virtually noise-free operation - Engineered for quiet, smooth engagement - the preferred characteristic for street-driven vehicles with aftermarket racing calipers where brake squeal is unacceptable in daily use.
• Consistent brake release characteristics - Delivers clean, predictable linear release on each application, supporting the precise brake modulation that aftermarket racing calipers are installed to provide on performance street and track day vehicles.
• 100% asbestos, lead, chromium, cadmium, and antimony free - Manufactured in an ISO-certified facility to strict quality and environmental standards.

Specifications

• Part Number: HB521F.800
• Compound: HPS (High Performance Street)
• Compound Code: F
• Friction Material: Ferro-Carbon
• Pad Thickness: 0.800 in. (Wilwood plate shape 7420 / AP Racing CP8250D41)
• Total Operating Temperature Range: 100-700°F
• Optimal Temperature Range: 100-500°F
• Caliper Compatibility: AP Racing CP8250 / CP8250D41 / CP8350 (Essex); CompBrake Pro Race One; StopTech ST-43 / C43; Wilwood Narrow Superlite 4 / Superlite 6 / Superlite Bridge Bolt / Superlite 4R / Superlite 6R / Superlite ST / Forged Superlite Internal (7420 plate shape)
• Rotor Compatibility: Iron/metal rotors only - not compatible with carbon ceramic rotors
• Recommended Use: Performance Street / Autocross / Light Track / Daily-Driven Big Brake Kit
• Sold as: Set of 2 (one caliper)

Included Components

• 2x Hawk HPS Brake Pads (HB521F.800)

Product Description

The Hawk HB521F.800 HPS brake pads bring Hawk's benchmark high-performance street compound to the HB521 pad shape at 0.800 in. thickness, fitting the AP Racing CP8250, CP8250D41, and CP8350 (Essex) calipers, CompBrake Pro Race One, StopTech ST-43/C43, and the Wilwood Superlite family of racing calipers using the 7420 plate shape. The 0.800 in. thickness is the thicker of the two available HB521 dimensions - the other being 0.650 in. at Wilwood plate shape 7416 - and applies to the AP Racing CP8250D41 and the Wilwood 7420 plate family, covering the Superlite 4R, 6R, and Bridge Bolt calipers in their full-thickness configuration.

HPS is the compound of choice for owners of AP Racing, StopTech, and Wilwood big brake kit installations who use their vehicles on public roads. It delivers 20-40% more stopping power than standard replacement compounds from dead cold through 700°F, extracts the full performance benefit of the larger caliper clamping force, and does so without the noise, dust, and cold-braking penalties that make higher-torque race compounds impractical on a daily-driven car. For street-driven vehicles that also see occasional autocross events or light track days, the HPS compound's wide 100-700°F operating range covers the full thermal envelope of dual-use driving without requiring a compound change between events.

At 0.800 in. thickness, this pad is specific to the Wilwood 7420 plate configuration and AP Racing CP8250D41. Verify your specific caliper's required pad thickness and retention method - some Wilwood Superlite bridge bolt configurations may require a center hole to be drilled in the pad. Compatible with iron and metal rotors only; carbon ceramic brake discs are not supported.