Hawk HB521F.650 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
• 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 7416)
• Wilwood Superlite Bridge Bolt
• Wilwood Superlite 4R / Superlite 6R (plate shape 7416)
• 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: 0.650 in. This corresponds to Wilwood plate shape 7416. The same pad shape is also available in 0.800 in. thickness (Wilwood plate shape 7420 / AP Racing CP8250D41); 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 use on public roads and dual-use street/autocross applications. It operates reliably from cold ambient temperature through 700°F, making it a practical 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 legendary street performance formula adapted for the AP Racing CP8250/CP8350, StopTech ST-43, and Wilwood Superlite family of aftermarket and big brake kit calipers, 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 vehicles with big brake kits that encounter widely varying brake temperatures throughout a daily commute or performance drive.
• 20-40% more stopping power than OEM - The HPS compound's higher coefficient of friction delivers noticeably stronger brake torque from the AP Racing, StopTech, and Wilwood calipers compared to standard replacement compounds, translating the increased clamping force of these larger calipers into shorter, more confident stopping distances.
• 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 pads in these high-demand applications.
• Gentle on rotors with extended pad life - The Ferro-Carbon formulation minimizes abrasive wear on rotor surfaces, extending service life for both the friction material and the rotors - an important consideration with the premium-cost rotors commonly 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 the performance advantage over stock.
• Virtually noise-free operation - Engineered for quiet, smooth engagement, making it the preferred HPS choice 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 - essential for 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.650
• Compound: HPS (High Performance Street)
• Compound Code: F
• Friction Material: Ferro-Carbon
• Pad Thickness: 0.650 in. (Wilwood plate shape 7416)
• Total Operating Temperature Range: 100-700°F
• Optimal Temperature Range: 100-500°F
• Caliper Compatibility: AP Racing CP8250 / 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 (7416 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.650)

Product Description

The Hawk HB521F.650 HPS brake pads bring Hawk's benchmark high-performance street compound to the HB521 pad shape at 0.650 in. thickness, fitting the AP Racing CP8250 and CP8350 (Essex) calipers, CompBrake Pro Race One, StopTech ST-43/C43, and the Wilwood Superlite family of racing calipers using the 7416 plate shape. Among all available compounds for the HB521 shape, HPS is the natural choice for owners of AP Racing, StopTech, and Wilwood big brake kit installations who drive their vehicles on public roads daily - providing a substantial improvement in stopping power over standard replacement compounds while retaining the near-silent, low-dust behavior that makes a big brake-equipped car practical as a daily driver.

The HPS compound operates from dead cold through 700°F, delivering consistent, fade-resistant street brake performance from the first stop of the morning through extended back-to-back hard stops at autocross events and light track days. For the large number of enthusiasts who have installed AP Racing, Wilwood, or StopTech calipers on their street cars specifically to improve braking performance, the HPS compound extracts that benefit fully - translating the increased caliper clamping force into 20-40% more stopping power than OEM pads - without the noise, dust, and cold-bite limitations associated with higher-torque race compounds on a daily-driven vehicle.

At 0.650 in. thickness, this pad is specific to the Wilwood 7416 plate configuration. The same HPS compound is available at 0.800 in. thickness (7420 plate) for calipers requiring that dimension. 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.