Brembo 08-13 BMW M3/11-12 1M Front GT BBK 6 Piston Cast 380x34 2pc Rotor Slotted Type3-Red

Brembo GT 1N3.9003A2 Front Big Brake Kit — 380x34mm | 6-Piston Red Monobloc | Type 3 Slotted | BMW M3 E90 E92 E93 & 1M

Name: Brembo GT 1N3.9003A2 Front Big Brake Kit — 380x34mm | 6-Piston Red Monobloc | Type 3 Slotted | BMW M3 E90 E92 E93 & 1M - Wyld Performance
SKU: brb1N3.9003A2
Price: 4895.00 USD
Availability: InStock

SKU: brb1N3.9003A2

$4,895.00

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Brembo GT Front Big Brake Kit w/ 2-Piece Type-3 Slotted Rotors | 2008–2013 BMW M3 & 2011–2012 1M

If you push your E9X M3 or 1M Coupe hard on track days, at local lapping events, or down twisty backroads, you quickly run into the limits of the stock front brakes. The factory single-piston sliding calipers trap an incredible amount of heat. When you stay on the brakes lap after lap, that heat boils your brake fluid, turns your pedal completely soft and spongy, and starts extending your stopping distances right when you need them most. The Brembo GT Front Big Brake Kit (Part Number: 1N3.9003A2) completely fixes this issue. It replaces your weak factory parts with heavy-duty 6-piston cast monobloc calipers and massive 380x34mm 2-piece floating rotors, giving you firm, repeatable stopping power that will not fade out.Brembo casts each of these bright red calipers as a single, solid piece of high-grade aluminum. By ditching the standard two-piece bolted design, these monobloc bodies cannot flex or twist when you jam down on the brake pedal, which keeps your pedal feel sharp and highly responsive. The kit is paired with Brembo’s advanced Type-3 (T3) curved-groove slotted rotors. These slots act like a continuous scraper, shaving away burnt pad glaze and venting off high-temp gasses so you get a crisp, immediate brake bite every single time you hit the pedal.

Features and Benefits

Rigid Monobloc Calipers: Cast from high-grade aluminum as a single solid piece so the caliper cannot flex under heavy track use, keeping your brake pedal feeling tight and communicative.
Type-3 (T3) Slotted Face: The motorsport-derived curved slot design aggressively clears out brake dust, road water, and gas buildup to keep your initial pad bite as sharp as possible.
380x34mm 2-Piece Floating Rotors: The lightweight aluminum center hat is loosely pinned to the outer iron brake ring. This lets the iron ring expand and contract naturally when it gets hot, stopping the warping and cracking common with 1-piece factory rotors.
Full Direct Bolt-On Kit: Arrives straight out of the box with braided stainless steel brake lines, custom mounting brackets for your factory spindles, and high-performance street/track pads pre-loaded into the calipers.
Built-In Weather Protection: Features inner pressure seals and recessed rubber dust boots over the pistons to keep road grime, grit, and winter moisture from ruining the internal caliper bores over long-term street driving.

Vehicle Fitment Matrix

This Brembo GT front axle upgrade kit is engineered as a direct mechanical bolt-on for the front spindles of these specific BMW chassis:

Year Range	Make	Model	Chassis / Engine Variant
2008–2013	BMW	M3 (Sedan)	E90 Chassis (4.0L S65 V8 - Front Axle Only)
2008–2013	BMW	M3 (Coupe)	E92 Chassis (4.0L S65 V8 - Front Axle Only)
2008–2013	BMW	M3 (Convertible)	E93 Chassis (4.0L S65 V8 - Front Axle Only)
2011–2012	BMW	1M Coupe	E82 Chassis (3.0L Twin-Turbo N54 - Front Axle Only)

Critical Wheel Clearance Warning: Because this kit uses massive 380mm rotors and thick 6-piston calipers, internal wheel barrel space is incredibly tight. This kit will not clear standard factory 18-inch wheels without using wheel spacers, and many wheel styles will require you to upgrade to 19-inch performance wheels. Always print out Brembo's official 1:1 clearance template and physically check it against the inside of your wheels before ordering.

Technical Specifications

Part Number: 1N3.9003A2
Caliper Type: 6-Piston Cast Monobloc Radial Mount
Caliper Paint Finish: High-Gloss Red with White Brembo Script Logo
Rotor Dimensions: 380mm Outer Diameter × 34mm Nominal Thickness
Rotor Construction: 2-Piece Vented Floating Disc Assembly
Disc Style: Type-3 (T3) Aggressive Slotted Face
Axle Application: Front Axle Only (Includes Complete Left and Right Setups)

Frequently Asked Questions (FAQ)

Will switching to this 6-piston kit make my factory brake pedal feel mushy?

No, it won’t. A common issue with poorly engineered brake upgrades is that the stock master cylinder cannot move enough fluid to fill the larger calipers, which makes the pedal travel too far. Brembo avoids this by calculating the exact fluid volume requirement of these 6 internal pistons to match the hydraulic displacement profile of your stock BMW M3 or 1M master cylinder. Your pedal will feel firmer and more immediate than stock.

Does this kit come with the necessary pads and lines included?

Yes, this is a complete standalone conversion package for your front axle. It arrives with pre-installed performance brake pads, vehicle-specific mounting brackets, all necessary installation bolts, and stainless steel braided hoses to replace your stock rubber lines that expand and degrade when hot.

Can I keep using my stock BMW 18-inch track wheels over this 380mm kit?

It is highly unlikely without the addition of hub-centric wheel spacers, and even then, it depends heavily on the inner barrel step of the wheel. While a few specific aftermarket 18-inch track wheels are engineered with an extra-wide barrel profile to clear big brake kits, the standard factory BMW 18-inch wheels will scrape against the outer edge of the caliper body. Moving up to a 19-inch wheel setup is highly recommended.

What is the correct procedure to bed-in this new rotor and pad combination?

To establish a proper transfer layer of pad material onto the iron rotor and prevent surface pad glazing or future brake shudder, you must perform a dedicated bed-in cycle right after installation:

Find a safe, open stretch of road where you can drive uninterrupted.
Perform 10 to 12 consecutive firm slowdowns from roughly 60 mph down to 10 mph. Apply strong, steady pressure, but do not slam the pedal hard enough to trigger the ABS.
Crucial: Never come to a complete, dead stop while keeping your foot on the brake pedal during this cycle. Doing so will leave an uneven pad imprint on the hot rotor face, causing permanent vibrations.
After the final slowdown, drive the car for 10 to 15 minutes at highway speeds without touching the brakes to let the air cool down the entire assembly smoothly.

⚠️ Fitment Note: This kit requires 19" wheels — including the stock 19" wheels. Verify chassis code compatibility using the Brembo Application Guide before ordering. Due to the nature of custom options, this kit is a NON-RETURNABLE product. Check fitment for your specific model before purchasing

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Brembo GT 1N3.9003A2 Front Big Brake Kit — 380x34mm | 6-Piston Red Monobloc | Type 3 Slotted | BMW M3 E90 E92 E93 & 1M