MPA Electrical 1003-2118M Disc Brake Pad Set - Rear

Rear Brake Pads for Subaru WRX and WRX STI

MPA Electrical Quality-Built Black Series Semi-Metallic Brake Pads are a standard replacement disc brake pad set for rear brake service on select Subaru performance sedans. This application-specific design focuses on smooth pedal response, low dust, and quiet operation for everyday driving and repeatable stopping performance.

Compatible With 2024-2026 Subaru WRX, rear and 2018-2021 Subaru WRX STI, rear. Part number 1003-2118M is built for drivers who want a direct-fit rear brake pad solution with predictable feel and consistent thermal performance.

Key Features

• Semi-metallic friction material for balanced stopping performance
• Application-specific friction formula for the listed Subaru rear brake applications
• Low-noise operation with pad shims included
• Adhesive-backed pad shim for improved noise control
• Integrally molded friction material attachment
• Standard replacement grade for routine brake service
• New condition replacement part

Black Series Brake Pad Line

The Quality-Built Black Series line is engineered for drivers who want consistent brake feel and dependable performance without unnecessary complexity. For the Subaru WRX and Subaru WRX STI rear axle applications listed here, the Black Series compound is formulated to deliver even pedal response across a wide temperature range while helping reduce brake noise and dust buildup.

Detailed Description

MPA Electrical 1003-2118M rear disc brake pads are made with a semi-metallic friction blend that supports stable braking under daily street use and spirited driving. The pad design uses an application-specific compound to match the rear brake requirements of the 2024-2026 Subaru WRX and 2018-2021 Subaru WRX STI, helping maintain predictable pedal feel and fade-resistant stopping performance. Pad shims are included, and the adhesive-backed shim design supports quieter operation.

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

Common Brake Issues Addressed

• Rear brake noise during light or moderate stops
• Excessive brake dust on rear wheels
• Uneven or inconsistent pedal feel
• Reduced stopping confidence from worn rear pads
• Brake fade during repeated braking events

Installation Notes and Tips

Inspect rear rotors, caliper hardware, and slide components before installation. Clean the caliper bracket contact points, apply brake lubricant where appropriate, and verify pad movement after assembly. Because mounting hardware, abutment clips, and brake lubricant are not included, reuse or replace related service parts as needed during brake maintenance.

Confirm rear fitment by model year before ordering: 2024-2026 Subaru WRX, rear, and 2018-2021 Subaru WRX STI, rear. Part number 1003-2118M should be matched to the rear axle only.

Quality Assurance

MPA Electrical Quality-Built Black Series brake pads are built as a new standard replacement part with an application-specific friction compound for the listed Subaru rear brake applications. The design emphasizes consistent braking behavior, low noise, and controlled dust output for routine service use.