EBC S1KR1721 Rear Brake Kit - Ultimax Pads + 300 mm RK Rotors (Rear 5-lug)

Vehicle Fitment (Common Applications - confirm before install)

• 2015-2019 Subaru Legacy (2.5i / 3.6R trims, select variants)
• 2015-2019 Subaru Outback (various trims / engines) / 2020-2024 Subaru Legacy & Outback (depending on trim)
• 2016-2019 Subaru WRX (rear brake configuration as per stock) - check electric-parking brake / caliper spec before install

Features

• Complete rear-axle disc brake kit: cast-iron RK rotors + high-efficiency Ultimax™ aramid-fiber brake pads
• Plain / smooth 300 mm diameter rear rotors with Geomet/anti-rust coating for corrosion resistance and extended life
• Vented (if specified) or solid rear rotor construction machined for smooth braking and reduced vibration
• Pads come pre-shimed and chamfered, with EBC's Brake-In™ coating - for quicker bedding, reduced noise and even pad wear
• Matched rotor + pad set - ensures correct rotor pad geometry and proper pad seating for both rear wheels
• Direct-fit replacement for compatible Subaru rear hubs / calipers - no modification needed when matched to correct bolt pattern/specs
• Sold as a 2-wheel rear set (rear left + rear right) - simplifies installation
• Designed for everyday driving & street use - balancing reliability, rotor life and pad wear (not intended for heavy track / racing use)

Specifications

• Position: Rear axle
• Rotor Outside Diameter: 300.0 mm (≈ 11.8 in)
• Disc Material: Cast iron
• Disc Finish: Geomet / anti-rust coating
• Bolt Pattern / Stud Count: 5-lug rear hub
• Pad Material: Ultimax™ aramid-fiber composite
• Quantity: 2-wheel (rear) set - rotors + pads
• Intended Use: OEM-style replacement / daily-driver street use

Included Components

• 1x Ultimax™ Rear Disc Brake Pad Set (for both rear wheels)
• 1x Pair of RK-Series Rear Disc Rotors (rear left + rear right)

Product Description

EBC S1KR1721 delivers a complete rear-axle brake solution with matched RK rotors and Ultimax™ aramid-fiber brake pads - engineered for smooth, dependable stopping and longer service life compared to many stock or basic aftermarket rear brakes. The 300 mm cast-iron rotors are precision machined and coated with a protective Geomet anti-rust finish to help prevent corrosion and extend longevity, especially in humid or corrosive environments.

The included Ultimax pads are pre-shimed, chamfered and coated with EBC's Brake-In™ surface - which facilitates quicker bedding-in, reduces noise, and helps ensure even pad wear over time. Because the kit is sold as a matched rotor-and-pad set and designed as a direct bolt-on replacement, installation is straightforward on compatible rear hubs and calipers (pending correct bolt pattern and rotor-spec match). This makes S1KR1721 a practical, reliable option for drivers replacing rear brakes on compatible Subaru sedans, wagons or performance variants. As with any multi-application kit - confirm your vehicle's rear hub bolt pattern, caliper type, rotor-hub dimensions, and brake-system spec before purchase or installation.