Ksport BKMZ090-621SO ProComp Big Brake Kit Floating Rotor Slotted Piston - 4/6/8

The Ksport BKMZ090-621SO ProComp Big Brake Kit is a high-performance braking upgrade engineered to deliver superior stopping power with significantly reduced brake fade. Featuring a slotted floating rotor design and your choice of 4, 6, or 8 piston caliper configurations, this kit is built for both aggressive street driving and track use.

Floating Two-Piece Rotor Design

The two-piece floating disc assembly reduces both rotating and unsprung weight for more responsive braking. The floating outer section is designed to shift slightly as needed, allowing for better self-centering in the caliper, lower brake drag, and more even pad application. This design also prevents thermal stresses from extreme heat from warping the disc or cupping the braking surface.

The proprietary slotted rotor design continuously cleans and refreshes the pad surface, expels gas and pad debris more efficiently than conventional slot designs, and significantly reduces braking noise. Every rotor is heat treated and balanced prior to shipment to ensure optimal performance right out of the box.

Aircraft-Grade Billet Aluminum Calipers

Each caliper is CNC machined from a single solid billet of aircraft-quality aluminum — never cast or welded — providing perfectly even wall thicknesses, unparalleled strength, and resistance to corrosion. Weighing just over 5 lbs. each, these calipers deliver substantial weight savings over OEM units without sacrificing rigidity. The opposed piston design greatly improves pad wear and caliper stiffness compared to stock. Standard caliper features include:

• Differential bore configuration for optimized clamping force
• Aluminum pistons for superior heat resistance
• High-temperature seals for reliable performance under extreme conditions
• Stainless steel brake pad wear plates on every caliper
• Machined-in protection grooves for bridge tubes

Stainless Steel Braided Brake Lines

D.O.T.-compliant stainless steel braided brake lines are included standard. These lines eliminate expansion under pressure, delivering a quicker pedal response and a firmer, more confident pedal feel compared to OEM rubber lines.

Slotted Rotors — Ideal for Track Use

Slotted rotors are recommended for vehicles that see more track use than daily driving. They offer superior heat and gas dispersion and are favored for their performance advantages under hard, repeated braking. For daily-driven applications, cross-drilled rotors are available and tend to run cooler.

Key Features:

• Slotted floating two-piece rotor construction
• Choice of 4, 6, or 8 piston caliper configurations
• CNC machined aircraft-grade billet aluminum calipers (~5 lbs. each)
• Opposed piston design for improved pad wear and caliper rigidity
• Aluminum pistons with high-temperature seals
• Stainless steel brake pad wear plates
• D.O.T.-compliant stainless steel braided brake lines
• Heat-treated and balanced rotors
• Bolt-on installation with minimal tools required in most applications