Alcon BMW F8X 4-Piston 355x28mm Rear Race Kit - Anodized

Continuous track days destroy factory F8X rear brakes fast. The main flaw is that the stock single-piston sliding calipers flex heavily under high line pressures, causing bad pad taper, massive thermal spikes, and premature electronic stability control interventions that ruin your lap times. The Alcon 4-Piston 355x28mm Rear Race Kit (Part Number: BRK.200510) eliminates this issue entirely. It replaces those weak OEM rear sliders with ultra-rigid, track-proven 4-piston monoblocks. Operating temperatures drop significantly while maintaining perfect compatibility with the factory master cylinder volume and ABS calibration limits.

Core Features & Technical Benefits

Forged CAR49 Calipers: CNC machined from high-strength aerospace alloy blocks. These 4-piston units weigh only 6.0 lbs per side. The stiff forged structure completely stops caliper body deflection under heavy braking, keeping your pedal firm and predictable through deep braking zones.

355x28mm Fully Floating Rotors: A 2-piece high-thermal design using lightweight 6061-T6 aluminum hats pinned to heavy cast iron friction rings. The floating hardware setup lets the outer iron ring expand freely under track heat, which completely stops thermal warping distortion and pad knock-back.

Retains Factory Parking Brake: Most stripped-down rear race kits require dropping the emergency brake assembly entirely. This Pro-System package keeps full internal functionality of your stock BMW e-brake shoes inside the custom aluminum rotor hat.

Staggered Piston Bores: Piston diameters are staggered across the caliper body to apply completely even linear pressure across the entire length of the pad face, stopping uneven pad taper and maximizing friction life during long endurance stints.

48 Directional Ventilation Vanes: Internal curved vanes act like a centrifugal pump, drawing cooler air through the rotor eyelet center and forcing hot air outward through the perimeter. It runs roughly 30% cooler than stock solid rotors.

Slotted Friction Faces: Precision surface slots sweep away brake dust, water films, and trapped boundary gases continuously. This maintains a sharp initial bite even in heavy rain downpours or messy track conditions.

Quick-Change Pad Bridge: Features a bolted structural pad retainer bridge that stiffens the caliper body layout under load, but allows you to pull and swap fresh track pads out quickly without removing the caliper from its main mounting bracket.

Complete Box Contents

This complete rear axle package arrives packed with two Forged Aluminum 4-Piston CAR49 calipers, two 355x28mm 2-piece slotted floating rotors with anti-rattle clips, heavy-duty aluminum mounting brackets, a full axle set of pre-bedded high-performance race pads, and all high-tensile mounting hardware fasteners required for a direct bolt-on install.

Exact Variant Details

Product Line: ALC Rear Brake Kits

Part Number: BRK.200510

Kit Description: Alcon BMW F8X 4 Piston 355x28mm Rear Race Kit - Anodized

Vehicle Fitment Guide

Direct bolt-on fitment for the following BMW high-performance chassis variants:

BMW M3 Sedan: 2015 - 2018 (F80 Chassis Only)

BMW M4 Coupe / Convertible: 2015 - 2020 (F82 / F83 Chassis Only)

BMW M2 / M2 Competition: 2016 - 2021 (F87 Chassis Only)

(Clearance Note: Due to the expanded 4-piston caliper outer profile clearance and 355mm rotor diameter scale, this rear kit requires a minimum of 19-inch wheels for barrel clearance. Check your track wheel inner barrel step profiles before placing an order).

Frequently Asked Questions

Will this rear kit trigger dashboard fault codes or mess up my ABS brake bias?

No. Alcon precisely matches the total fluid displacement volume of the four internal pistons to the original factory rear caliper specifications. Your OEM master cylinder setup, brake booster, and ABS algorithms will function completely normally without throwing dashboard traction fault codes or altering front-to-rear brake bias balance.

Do I need to buy brake pads separately for this kit?

No. This package ships completely outfitted out of the box with a set of high-performance brake pads and pre-installed anti-rattle clips. The entire kit assembly is dyno-bedded at the factory facility so it is ready to handle hard heat cycles right after installation.

Why choose hard anodized over a painted or powder-coated caliper finish?

Painted and powder-coated finishes work fine for casual street driving but quickly blister, peel, and shift colors when track temperatures cross the 500-degree threshold. The hard-anodized treatment chemically bonds straight into the aluminum alloy structure, offering maximum resistance to chemical corrosion and extreme track heat without surface degradation.