Brembo 08.B348.4X Disc Brake Rotor - Rear

Brembo Rear Drilled Rotor for Mercedes-Benz and INFINITI

The Brembo Premium Xtra Cross Drilled UV Coated Rotor is a direct replacement disc brake rotor built to meet or exceed OEM specifications. This rear rotor combines a drilled braking surface, high carbon cast iron construction where applicable, and a UV-coated rust-resistant finish to support consistent braking performance on select Mercedes-Benz and INFINITI applications.

Part number 08.B348.4X is engineered for drivers who want OE-style fitment with added surface protection and reduced noise and vibration characteristics. It is a strong match for rear brake service on the Mercedes-Benz CLA250, GLA250, B250, B250e, B Electric Drive, and INFINITI QX30.

Key Features

• Part number: 08.B348.4X
• Rear disc brake rotor
• Drilled braking surface for improved heat management
• UV-coated rust-resistant finish
• High carbon material where applicable for reduced noise and vibration
• Outside diameter: 295 mm
• Nominal thickness: 10 mm
• Minimum thickness: 8.3 mm
• 5-lug design with 67 mm centering diameter
• Fixing screws included
• Solid rotor design

Premium Xtra Rotor Line

Brembo’s Premium Xtra Cross Drilled UV Coated Rotor line focuses on direct-fit replacement rotors with added surface protection and a performance-oriented drilled design. The UV coating helps protect exposed surfaces, including the braking plate surfaces, while the intelligent marking location identifies the part number and minimum thickness for easier service checks. For brake system restoration, Brembo recommends replacing rotors and pads together.

Vehicle Fitment

• Fits 2015-2020 Mercedes-Benz GLA250, rear
• Fits 2017-2019 INFINITI QX30, rear
• Fits 2013-2019 Mercedes-Benz B250, rear
• Fits 2015-2019 Mercedes-Benz CLA250, rear
• Fits 2014-2018 Mercedes-Benz CLA250, rear, without Sport Package
• Fits 2016-2017 Mercedes-Benz B250e, rear
• Fits 2014-2015 Mercedes-Benz B Electric Drive, rear

What This Rotor Helps Address

• Brake pulsation from worn or uneven rear rotors
• Noise and vibration during braking
• Surface corrosion on exposed rotor areas
• Reduced braking consistency from heat buildup
• Service replacement needs on rear brake systems

Installation Notes

Verify rotor dimensions, hub fitment, and rear axle application before installation. This rotor uses a 5-hole pattern, 67 mm centering diameter, and 130 Nm torque specification. Replace pads at the same time to restore braking performance, and pair the rotor with Brembo NAO/Ceramic or Low Met brake pad formulations when servicing the brake system.

Quality Assurance

Brembo manufactures this rotor as an OE-style replacement built to meet or exceed original equipment specifications. The UV-coated finish, high carbon construction where applicable, and included fixing screw kit support a clean, service-ready installation. This part cross-references Raybestos Brakes (e.g., 981086FZN, 981086R) for the same application.