PRL Motorsports 4-Piston Big Brake Caliper Kit – Honda Civic Si / Acura Integra

Massive Stopping Power in a Lightweight Package

The PRL Motorsports 4-Piston Big Brake Caliper Kit is built to give your Honda Civic Si or Acura Integra the high-performance stopping power it deserves. Featuring forged aluminum 4-piston calipers, this kit offers a significant upgrade in braking performance, heat resistance, and durability without sacrificing weight. Designed for street and track use, these calipers bring balanced brake modulation and improved pedal feel—perfect for spirited driving or weekend events. This BBK setup is a very well thought out design, using the oem rotor (huge win), and the FK8 Pad. And includes everything you need, we even take this kit a step further by offering you a simple click and go add-ons that make this a very simple on stop experience. 

Smart Design, Real Performance PRL’s 4-Piston Brake Caliper Kit for the 10th and 11th Gen Honda Civic Si and Acura Integra was developed with a clear goal: deliver real performance without adding complexity. By building the kit around the commonly available **312x25mm factory rotor**, PRL avoids the need for special or proprietary rotors. That means easier maintenance, faster part sourcing, and no surprise costs when it’s time for service. Uses FK8 Civic Type R Brake Pads The caliper was engineered to accept the **FK8 Civic Type R front brake pad shape**, giving users access to a wide range of high-performance pad options already trusted on track-proven platforms. Whether you're daily driving or pushing hard at the track, the pad selection is easy, affordable, and built for performance. Fixing What the Factory Missed, The stock braking setup on the Civic Si and Integra uses a basic single-piston floating caliper that’s fine for daily use—but once temperatures rise or you start demanding more from the car, it quickly shows its limits. Pedal fade, inconsistent feel, and limited heat management become issues fast. Engineered for Balance and Confidence PRL’s in-house-designed 4-piston caliper brings better pad contact, more consistent pedal feel, improved thermal performance, and added confidence under hard braking—all while keeping drivability intact. It’s a fixed caliper design that bolts directly to the OEM hub and knuckle setup using the 312mm rotor. The kit also includes stainless steel braided brake lines for improved pedal response and better feel at higher speeds.

PRL is also developing a future version of this kit to support larger rotor setups. For now, this release focuses on maximizing performance and reliability with the OEM-sized rotor setup and a clean bolt-on install.

Precision-Engineered for OEM Compatibility

This kit is designed to be a direct bolt-on upgrade for 2022+ Honda Civic Si and 2023+ Acura Integra (A/T & M/T) models. It works seamlessly with oem brake system and even gives you upgraded brake lines. The kit also uses the FK8 / FL5 factory brake pads, making it a cost-effective and maintenance-friendly upgrade. There’s no need for extensive modifications or special tools—just bolt on and go for these models.

Built to Handle Heat and Pressure

Each caliper is CNC machined from forged aluminum for strength and heat management. Dual internal fluid crossovers allow a single-piece design with no external crossover lines, reducing complexity and failure points. Stainless steel pistons and plates provide resistance to corrosion, heat, and wear. High-temperature seals and internal dust boots mean these calipers are track-ready and street-tough.

Everything You Need in One Kit

This kit comes complete with left and right anodized calipers in your choice of finish: Satin Blue or Gunmetal Grey. Also included are 

• (2) PRL 4-Piston Forged Aluminum Calipers
• (2) Stainless Steel Braided Brake Lines
• (2) Application-Specific Brackets (CNC-machined steel) 
• Full Hardware Kit: Crush washers, banjo bolts, security pins, pad spring bridges, bolts, bleeder cap

Brake pads and rotors are *not* included. You can re-use oem or purchase upgraded Civic Si Rotors. This kit is designed to work with your existing OE rotors and FK8 pads both oem or upgraded fk8 pads, which we offer here at hardmotion in the kit so you have everything. 

Will these work with my stock wheels?

Yes with a 20mm Spacer. That or we suggest an upgraded sport style wheel which we offer. We are working on getting specs of wheels that fit without spacers needed. You can find wheels here: https://hardmotion.com/wheels/

Key Features:

• Forged aluminum 4-piston caliper construction
• CNC machined for precision and durability
• Direct bolt-on for 2022+ Civic Si & 2023+ Acura Integra (A/T & M/T)
• Stainless steel pistons and abutment plates - Internal dust boots and high-temp seals for longevity
• Anodized finish in Satin Blue or Gunmetal Grey
• (2) PRL 4-Piston Forged Aluminum Calipers
• (2) Stainless Steel Braided Brake Lines
• (2) Application-Specific Brackets (CNC-machined steel) 
• Full Hardware Kit: Crush washers, banjo bolts, security pins, pad spring bridges, bolts, bleeder caps
• Brake pads and rotors not included (optional upgrades we have here).
• Brake pad had to be the FK8 oem or compatible pad, which we have a huge section here for that - FK8 Brakes

Specs & Dimensions: 

• Caliper Material and Construction: Forged 6061-T6 aluminum, 2-piece body
• Piston Design: 44mm primary / 41mm secondary
  • Aluminum 6061-T6 Billet with vented Type 3 hard anodized pistons
• Bracket Material: CNC-machined 4140 billet steel with electrocoated finish
• Pad Compatibility: FMSI D1001 (F50 / Type R / STI pad shape)
• Rotor Fitment: OEM 312mm x 25mm rotor (10th & 11th Gen Civic Si, 2023+ Integra)
• Weight (per side): Approx. 8.8 lbs with bracket and hardware
• Finish: Hard anodized caliper body for thermal resistance, corrosion protection, and clean aesthetics
• Brake Lines: Kit includes a set of stainless steel braided brake lines (required, not optional)

 Direct Vehicle Fitment:

• 2017–2021 Honda Civic Si (HC10)
• 2022+ Honda Civic Si (HC11)
• 2018+ Honda Accord
• 2023+ Acura Integra (DE4)
• Many other Honda models when using the 312mm Si rotor
• *Will need 20mm spacer to fit OE Honda/Acura wheels

Fitment With Rotor Modification:

• 2012-2015 Honda Civic Si
• 2012-2015 Honda Civic EX (282mm)
• 2012-2015 Honda Civic LX (262mm)
• 2006-2011 Honda Civic Si 
• 2006-2011 Honda Civic EX/LX

Part #: 

• Satin Blue = PRL.1002.blu
• Gunmetal Grey = PRL.1002.1.gry