Brembo 1E5.6003A4 GT Series Slotted Front Big Brake Kit for 2015-2021 Subaru WRX

Vehicle Fitment

• 2015-2021 Subaru WRX (Base, Premium, Limited, 2.0L Turbo H4, AWD, Sedan)

Fitment Notes

• Front axle kit only - sold as a complete front pair (2 calipers, 2 rotors, pads, lines, and hardware)
• Does NOT fit Subaru WRX STI - STI models come factory-equipped with Brembo brakes
• Does NOT fit 2022-2025 Subaru WRX (VB chassis) - a separate brake kit is required for the new platform
• Kit is larger than the factory WRX brake setup - aftermarket wheels with sufficient caliper clearance may be required; consult Brembo's wheel fitment guide before ordering
• Compatible with factory master cylinder, ABS, and traction control systems - no additional modifications required
• A drilled rotor version of this kit is also available as Part# 1E4.6003A4
• For 2002-2014 Subaru WRX, see Part# 1E5.6002A4
• Backed by a 2-year Brembo limited warranty from date of purchase

Features

• OE-equivalent 4-piston gold calipers - the same caliper platform found on the Subaru WRX STI from the factory
• Slotted 326mm x 30mm high carbon 1-piece rotors - sweeping slot design wipes rotor face clean of pad dust and expels heat gases for improved bite and cooler running temperatures
• Vented pillar vane rotor construction reduces thermal shock-related cracking risk by up to 40% compared to standard venting
• Cast 2-piece axial mount caliper body with inner pressure seal and OEM-approved dust boots for long-term reliability
• Full drop-in compatibility with factory ABS, traction control, and master cylinder - no recalibration required
• Includes TUV/DOT-homologated stainless steel braided brake lines for improved pedal feel and fade resistance
• Street compound pads included - formulated for spirited street driving and occasional track use
• Pre-assembled kit with all necessary hardware for a straightforward installation

Specifications

• Part Number: 1E5.6003A4
• Kit Type: Front Big Brake Kit - Complete Front Axle Set
• Caliper Piston Count: 4-Piston per caliper
• Caliper Body: Cast 2-Piece Axial Mount
• Caliper Finish: Gold
• Rotor Type: Slotted, 1-Piece
• Rotor Material: High Carbon with Corrosion Resistant Plating
• Rotor Diameter: 326mm (12.83 in.)
• Rotor Width: 30mm (1.18 in.)
• Rotor Vane Design: Vented Pillar Vane
• Position: Front
• Drivetrain: AWD
• Pad Compound: Street / Subaru OE Spec

Included Components

• 2x 4-Piston Gold Calipers (Left and Right)
• 2x Slotted High Carbon 326mm x 30mm Rotors (Left and Right)
• 1x Set of Street Compound Brake Pads
• 2x Stainless Steel Braided Brake Lines
• 1x Complete Hardware and Fastener Kit

Product Description

The Brembo 1E5.6003A4 GT Series Front Big Brake Kit is purpose-engineered for the 2015-2021 Subaru WRX, delivering the factory WRX STI's 4-piston Brembo caliper platform with the added benefit of performance-slotted rotors. The 326mm x 30mm high carbon rotors feature a vented pillar vane design that reduces heat buildup by up to 40% compared to standard venting, while the slotted surface continuously cleans pad deposits from the rotor face for consistent bite, cooler temperatures, and improved pedal response.

This is a complete, pre-assembled front axle kit that bolts directly onto the WRX using the factory master cylinder, ABS, and traction control system with no additional modifications. The included stainless steel braided brake lines replace the factory rubber hoses for firmer, more consistent pedal feel under repeated hard braking. Street compound pads are included for immediate installation and are suited for spirited street driving and occasional track days. Note that the increased rotor diameter may require aftermarket wheels with adequate caliper clearance - consult Brembo's wheel fitment guide prior to purchase. For drilled rotors, see Part# 1E4.6003A4.