Hawk HB803Z.639 Ceramic Rear Brake Pads 2015-2023 Ford Mustang GT/EcoBoost

Vehicle Fitment

• 2015-2023 Ford Mustang EcoBoost / EcoBoost Premium (2.3L EcoBoost I4, RWD) - Rear, all brake packages
• 2015-2023 Ford Mustang EcoBoost Performance Package (2.3L EcoBoost I4, RWD) - Rear
• 2015-2018 Ford Mustang V6 (3.7L V6, RWD) - Rear
• 2015-2023 Ford Mustang GT / GT Premium (5.0L Coyote V8, RWD) - Rear, all brake packages incl. Brembo
• 2015 Ford Mustang GT 50 Years Limited Edition (5.0L Coyote V8, RWD) - Rear
• 2019-2020 Ford Mustang Bullitt (5.0L Coyote V8, RWD) - Rear
• 2021-2023 Ford Mustang Mach 1 (5.0L Coyote V8 High-Revving, RWD) - Rear

Fitment Notes

• Rear axle application only - OEM caliper, 0.639 in. pad thickness.
• Covers all S550-generation Mustang (2015-2023) rear caliper configurations - the rear brake system is shared across all S550 trims regardless of front brake package (standard, Performance Package, or Brembo 6-piston).
• Does not fit the Shelby GT350, GT350R, GT500, or any Shelby model, which use a different rear caliper and pad shape.
• Street use only - Performance Ceramic is not designed for sustained track or race use.
• Not compatible with carbon ceramic rotors; designed for iron/metal rotors only.
• Compatible with stock, slotted, and cross-drilled iron/metal rotors.
• No electronic wear sensor or hardware included.

Features

• Performance Ceramic compound eliminates rear brake squeal and dramatically reduces wheel dust - the premium daily-driver upgrade for S550 Mustang owners who want cleaner rear wheels and quieter stops without compromising braking performance.
• Ultra-low dust output keeps alloy wheels significantly cleaner than OEM or Ferro-Carbon compounds - particularly noticeable on the S550's large-diameter wheels where rear brake dust accumulates visibly.
• Linear friction profile maximizes ABS and stability system effectiveness for smooth, progressive rear deceleration across all driving conditions.
• Improved stopping power over OEM replacement pads with stable, consistent friction output from cold - no warm-up required for confident daily driving.
• Extremely gentle on rear rotors with extended pad and rotor service life.
• Backed by Hawk's limited lifetime warranty against manufacturing defects.

Specifications

• Part Number: HB803Z.639
• Compound: Performance Ceramic (Z)
• Pad Thickness: 0.639 in.
• Position: Rear
• Caliper Type: OEM
• Platform: Ford Mustang S550 (2015-2023)
• Material: Ceramic
• Operating Temperature Range: 100-650°F
• Optimal Temperature Range: 100-450°F
• Construction: Integrally molded
• Electronic Wear Sensor: No
• Hardware Included: No

Included Components

• 2x Performance Ceramic Brake Pads (Rear Axle Set - Driver and Passenger Side)

Product Description

The Hawk HB803Z.639 Performance Ceramic rear brake pads are engineered for the rear axle of the 2015-2023 Ford Mustang S550 across all trims - EcoBoost, V6, GT, Bullitt, and Mach 1. For daily-driven S550 owners who want the cleanest, quietest possible rear brake upgrade without giving up improved stopping power, the Performance Ceramic compound delivers the best combination of refinement and performance available in a street pad on this platform.

The ceramic compound's ultra-low dust output is a particular benefit on the S550 Mustang, where rear brake dust tends to darken the wheels quickly with OEM or Ferro-Carbon compounds. The linear friction profile works seamlessly with the S550's ABS and AdvanceTrac stability systems for smooth, predictable rear deceleration in all conditions - from wet winter commuting to dry summer canyon roads. These pads are designed for street use and are not suitable for sustained track driving; Mustang owners seeking a track-capable rear compound should consider the HP Plus (HB803N.639) variant on the same pad shape. A proper bed-in procedure is recommended after installation.