PowerStop K6657 Disc Brake Kit - Rear

Rear Brake Upgrade for BMW Daily Drivers

PowerStop K6657 is a rear disc brake kit built for BMW drivers who want a cleaner, more responsive brake upgrade for everyday use. It combines carbon-fiber ceramic rear pads with drilled and slotted vented rotors to support consistent stopping performance and reduced brake dust.

Engineered for rear applications on select BMW 228i, 230i, 320i, 328i, 428i, M235i, and M240i models, this kit is a direct-fit service solution for drivers looking to refresh worn rear brakes with a performance-focused setup. The PowerStop K6657 package is part of the Z23 Daily Driver line, which centers on street use, low dust, and corrosion resistance.

Key Features

• Carbon-fiber ceramic friction material for performance-oriented street braking
• Low-dust pad formula to help keep wheels cleaner
• Drilled and slotted rotor surface for improved heat management and pad bite
• Vented rear rotor construction for rear brake service applications
• Pad wear sensor included
• Pad shims included
• Rear rotor outside diameter: 345.0 mm
• Fits rear brake service applications on select BMW models

Z23 Daily Driver Brake Line

The PowerStop Z23 Daily Driver line is built for drivers who want an easy brake upgrade without moving to a track-focused setup. K6657 uses carbon-fiber ceramic pads paired with drilled and slotted rotors to deliver a balanced street-brake package for BMW 230i, BMW M240i, and other listed rear applications. The design focuses on everyday drivability, cleaner wheels, and rotor protection against rust and corrosion.

Detailed Description

PowerStop K6657 is a rear brake kit for select BMW 2 Series and 3/4 Series applications, including 2012-2021 BMW 328i, 2013-2015 BMW 428i, 2014-2016 BMW 228i and M235i, 2017-2021 BMW 230i and M240i, and related xDrive models listed in fitment. It is intended for rear brake service where a direct replacement with a performance-style rotor and pad combination is needed. The drilled and slotted rotor design helps promote cooler operation, while the carbon-fiber ceramic pads are formulated for lower dust output and smooth street braking.

This part number, K6657, is a practical choice for BMW owners replacing worn rear brakes on daily-driven vehicles that use the specified rear rotor size and caliper configuration. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Kit Can Address

• Worn rear brake pads and rotors
• Brake dust buildup on wheels
• Rotor surface rust and corrosion
• Brake fade concerns during repeated street stops
• Uneven braking feel from aged rear brake components

Installation Notes and Tips

Verify rear fitment by year, model, and brake configuration before ordering. This kit is listed for rear applications only and includes fitment notes for models with 4-piston front calipers or full-cast replacement design rotors on certain BMW applications. Confirm rotor diameter and rear brake setup against the vehicle before installation. K6657 is a bolt-on style brake service kit for the listed applications, and proper brake bedding is recommended after installation.

Quality Assurance

PowerStop positions the Z23 Evolution Sport Brake Upgrade Kit as a complete brake service solution for daily drivers, using carbon-fiber ceramic pads, drilled and slotted rotors, and premium stainless-steel hardware in the product line. K6657 follows that same rear brake upgrade approach for the listed BMW applications.