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Cusco BCS USDM GDA-B-C WRX-STI Cusco CUS666 561 ALHD
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Cusco BCS USDM GDA-B-C WRX-STI

Cusco
CUS666 561 ALHD
Brake Cylinder Stops
3 Units In Stock - Ships Next Business Day
$ 140.00 $ 126.00
$ 126.00

SKU: 666 561 ALHD

Cusco BCS Brake Cylinder Stop for 2002-2007 USDM Subaru Impreza WRX STI GDA GD Chassis

Cusco Brake Cylinder Stop BCS 666 561 ALHD locks the brake master cylinder on 2002-2007 USDM left-hand drive Subaru Impreza WRX STI GDA-B-C and GD chassis models. It stops cylinder rotation during hard braking and cornering to ensure steady pedal response and reliable stopping power. Bolt-on installation delivers instant gains for street or track driving.

Key Features

  • CNC Machined Aluminum Construction: Lightweight 6061-T6 aluminum body weighs just 0.22 lbs for strength without added unsprung mass
  • Anodized Finish: Black anodizing resists corrosion from track abuse and road salt
  • Direct Bolt-On Fit: Designed for GDA-B-C WRX STI and compatible Impreza models with zero modifications
  • Master Cylinder Stabilization: Locks position under high G-forces to hold brake pressure and pedal firmness
  • LHD USDM Specific: Built for left-hand drive North American Subaru Impreza platforms

Product Notes

  • Pair with Cusco brake pads and lines for full system synergy
  • Clean mounting surfaces before installation for secure torque
  • Ships in protective foam-lined box measuring 5 x 3 x 2 inches

Installation Notes

  • Professional installation recommended.
  • Remove OEM rubber stopper and torque new BCS to 10-12 Nm
  • Compatible with factory and aftermarket master cylinders on listed models

This Part Fits

Year Make Model Submodel
2004-2007 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited
2006-2007 Subaru Impreza WRX TR
2006-2007 Subaru Impreza 2.5i
2002-2004 Subaru Impreza Outback
2005-2007 Subaru Impreza Outback Sport
2002-2005 Subaru Impreza RS
2002-2004 Subaru Impreza TS
2002-2007 Subaru Impreza WRX
2006-2007 Subaru Impreza WRX Limited

Why Choose Cusco?

  • Proven in Super Taikyu and rally racing worldwide
  • High-strength materials tested for endurance
  • Exact OEM-spec tolerances from Japanese engineering

Frequently Asked Questions

  • Q: Will this fit my 2004 Subaru Impreza WRX STI hawkeye?
    A: Yes, Cusco 666 561 ALHD BCS fits 2002-2007 GD/GDA chassis WRX STI including USDM hawkeye models with LHD
  • Q: What material is the BCS made from?
    A: Precision CNC machined from 6061-T6 aluminum with black anodized finish for strength and corrosion protection
  • Q: Is installation DIY friendly and what tools are needed?
    A: Bolt-on replacement takes 15-30 minutes with basic tools like 10mm socket, torque wrench, and brake cleaner. no special hardware required

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Compact box 5 x 3 x 2 inches
  • Weight: 0.22 lbs

Request For Information

Have questions about Cusco BCS USDM GDA-B-C WRX-STI? Fill out the form below and we'll get back to you by the next business day.
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Black Ops Auto Works proudly honors active duty military, veterans, National Guard, reserves, police officers, firefighters, and EMTs with an exclusive 5% discount on all performance parts and carbon fiber upgrades. Verify instantly and start saving today.

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