R1 Concepts 2551-2189-00 Disc Brake Pad Set - Rear

Rear Brake Pads for Buick and Cadillac

R1 Concepts R1 Optimum OE Pads part number 2551-2189-00 are rear disc brake pads for select Buick and Cadillac applications. This rear brake pad set is listed for the Buick Envision, Cadillac XT4, and Buick Regal Sportback across the model years shown below.

Key Features

• Disc brake pad set for rear axle use
• R1 Optimum OE Pads product line
• Fits 2021-2026 Buick Envision, rear
• Fits 2020-2025 Cadillac XT4, rear
• Fits 2018-2020 Buick Regal Sportback, rear
• Part number 2551-2189-00 for application matching

Product Details

The R1 Optimum OE Pads line is positioned as an OE-style brake pad option for drivers who need a direct rear pad replacement on listed Buick and Cadillac vehicles. This set is cataloged for rear position use only and is a fitment-based choice for 2021-2026 Buick Envision, 2020-2025 Cadillac XT4, and 2018-2020 Buick Regal Sportback applications. If you are searching for rear brake pads for Buick Envision or rear ceramic pads for Cadillac XT4, part number 2551-2189-00 matches the vehicle coverage shown in the fitment data.

What It Is Used For

• Replacing worn rear brake pads
• Addressing brake noise from pad wear
• Restoring rear braking response
• Correcting uneven rear pad thickness
• Servicing rear brake maintenance on listed Buick and Cadillac models

Installation Notes and Tips

Install on the rear axle only and verify vehicle year, make, model, and trim before ordering. Confirm rotor condition, caliper operation, and pad fitment during brake service. For search accuracy, this part is commonly referenced as rear brake pads for 2021-2026 Buick Envision, rear brake pads for 2020-2025 Cadillac XT4, and rear brake pads for 2018-2020 Buick Regal Sportback.

Quality Assurance

R1 Concepts identifies this product under the R1 Optimum OE Pads line for OE-style replacement coverage. Part number 2551-2189-00 is cataloged for the listed rear applications and should be matched to the vehicle fitment data before installation.