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Track-Grade Front Braking for the Supercharged Shelby GT500
Delivering over 700 horsepower from a supercharged 5.2-liter V8, the Ford Mustang Shelby GT500 demands a brake pad compound that keeps pace under sustained track stress. Hawk Performance part number HB928C.644 uses the HPX motorsports compound on the front axle of the 2020 through 2022 Shelby GT500, providing smooth initial bite and clean modulation that lets drivers precisely modulate the pedal when braking from triple-digit speeds. The HPX compound is not street-rated and is intended for authorized track and race events only.
Key Features
- HPX compound code "C" medium torque, medium temperature race friction material
- Optimal temperature range: 100 to 600 degrees F; operating range: 100 to 700 degrees F
- Predictable smooth initial bite for confident threshold braking in the GT500
- Validated on Hawk Performance's dynamometer program and confirmed for HB928C.644 front fitment
- Engineered to mate directly with the factory Brembo six-piston front calipers on the 2020-2022 GT500
- Not compatible with carbon ceramic rotors; designed for iron or steel rotors only
- Motorsport configuration no shims included
- Hawk Performance limited lifetime warranty on HB928C.644
What's Included
- One set of Hawk HPX front brake pads (HB928C.644) for the 2020-2022 Ford Mustang Shelby GT500
Installation Instructions
- Raise the vehicle and secure on jackstands; remove front wheels.
- Remove caliper mounting bolts and slide the caliper off the rotor. Suspend with wire do not stress the brake hose.
- Remove the old pads and clean the pad abutment surfaces on the caliper bracket.
- Compress the front caliper pistons with a C-clamp or piston compressor tool.
- Install the new HB928C.644 HPX pads; confirm proper seating in the caliper carrier.
- Reinstall the caliper and torque the mounting bolts per the Ford GT500 factory specification.
- Reinstall wheels, torque lug nuts, and pump the brake pedal to move pistons into contact with the new pads.
- Perform the Hawk bed-in procedure on track before full-load braking events.
Specs
| Attribute | Detail |
|---|---|
| Part Number (MPN) | HB928C.644 |
| SKU | HAWKHB928C.644 |
| UPC | 840653057903 |
| Compound | HPX (Code C) |
| Position | Front |
| Pad Thickness | 0.644 in |
| Optimal Temp Range | 100 to 600 degrees F |
| Max Operating Temp | 700 degrees F |
| Torque Level | Low to Medium |
| Street Legal | No motorsports use only |
| Shims Included | No |
| Rotor Compatibility | Iron / steel rotors only |
| Warranty | Limited lifetime (Hawk Performance) |
This Part Fits
| Year | Make | Model | Submodel / Notes |
|---|---|---|---|
| 2020 | Ford | Mustang | Shelby GT500 Front |
| 2021 | Ford | Mustang | Shelby GT500 Front |
| 2022 | Ford | Mustang | Shelby GT500 Front |
Frequently Asked Questions
Does HB928C.644 fit the standard Mustang GT or GT350 front calipers?
No. The HB928C.644 is designed specifically for the Brembo six-piston front caliper fitted to the 2020-2022 Shelby GT500. GT and GT350 models use different pad shapes.
What compound code is "C" in the part number HB928C.644?
The letter C designates the HPX friction compound, indicating a medium torque, medium temperature motorsports material with clean modulation characteristics.
Can I drive the GT500 home from a track day on HB928C.644 pads?
These pads are not street-rated and will perform poorly at low street temperatures. For mixed street and track use, consider Hawk's HP Plus (N code) compound instead.
What is the pad thickness dimension in HB928C.644?
The thickness dimension is 0.644 inches, encoded directly in the Hawk part number system after the compound code letter C.
Is a bed-in procedure required?
Yes. Proper heat cycling of HB928C.644 on track is mandatory before hard stops. Follow Hawk's published bed-in sequence of progressive brake applications with full cool-down intervals.
Are shims included with HB928C.644?
No. Hawk motorsports pad sets do not include shims, consistent with race-use configuration standards.
Will these pads increase brake noise at low speeds?
Yes. Race compounds like HPX typically produce more noise and dust at sub-optimal temperatures, which is normal behavior for motorsports friction materials.
Do the HB928C.644 pads work with the GT500's electronic brake booster?
Yes. These pads install in the existing caliper and work with all OEM brake actuation systems, including the GT500's electronic brake booster, without modification.
Proposition 65 Warning: This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
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