PowerStop KC5381 Disc Brake Kit - Rear

Rear Brake Upgrade for Sonata and Optima

PowerStop KC5381 is a rear disc brake kit built for daily-driver use on select Hyundai Sonata and Kia Optima applications. It combines carbon-fiber ceramic brake pads, drilled and slotted rotors, and powder coated rear calipers to deliver a direct-fit brake service solution for rear axle replacement.

Compatible With 2011-2015 Hyundai Sonata, rear, and 2011-2015 Kia Optima, rear. This kit is also listed for 2015 Kia Optima, rear, for models manufactured in Korea. PowerStop KC5381 is part of the Z23 Evolution Sport Brake Upgrade Kit with Calipers line, which focuses on performance-oriented street braking with low-dust pad material and corrosion-resistant components.

Key Features

• Carbon Fiber Ceramic friction material for rear brake service
• Slotted x drilled rotor surface for improved heat management and consistent pedal feel
• Powder coated Bengal Red rear calipers for corrosion resistance and visible wheel-side appearance
• Rear floating caliper design with 1 piston
• Rear rotor outside diameter: 283.0 mm
• Pad shims included
• Rear caliper mounting bracket included
• Solid rear rotor construction

Product Details

KC5381 is engineered as a rear brake upgrade kit for drivers replacing worn rear pads, rotors, and calipers on the Hyundai Sonata and Kia Optima. The carbon-fiber ceramic pad compound is formulated for lower dust output than many conventional friction materials, helping reduce brake dust buildup on wheels. Drilled and slotted rotors support cooler operation and help resist rust and corrosion, while the powder coated calipers add a durable finish that stands out behind the wheel.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What This Brake Kit Helps Address

• Rear brake noise from worn pads or uneven rotor surfaces
• Brake dust buildup on wheels from standard friction material
• Reduced braking consistency caused by heat-soaked rear components
• Corrosion on rear rotors and calipers
• Brake service needs on rear Hyundai Sonata and Kia Optima applications

Installation Notes and Tips

Verify rear axle fitment by year, model, and application notes before ordering. KC5381 is a rear brake kit, so it should be matched to the rear position only. Inspect the hub, brake lines, and mounting points during service, and confirm rotor diameter and caliper configuration against the vehicle before installation.

Quality Assurance

PowerStop develops its Z23 Evolution Sport Brake Upgrade Kit line for straightforward brake replacement on daily-driven vehicles, using performance-focused pad material, coated calipers, and corrosion-resistant rotor finishes. KC5381 follows that product-line approach for rear brake service on select Hyundai Sonata and Kia Optima models.