Brembo 09.D394.21 Disc Brake Rotor - Front

Brake Rotor Overview

Brembo PRIME disc brake rotor 09.D394.21 is a front vented rotor built for heavy-duty braking applications. It uses gray cast iron, a full cast construction, and a rust-resistant coating to support consistent braking performance and corrosion protection.

Compatible with Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, GMC Sierra 3500 HD, Chevrolet Suburban 3500 HD, and Cadillac SRX front brake applications, this rotor is sized for larger truck and SUV platforms. The smooth surface and premium grade construction align with OE-style service replacement needs.

Key Features

• Vented disc brake rotor for improved heat management
• Gray cast iron construction with full cast design
• Rust-resistant coating for added surface protection
• Smooth friction surface for stable pad contact
• Premium grade rotor with 6-lug hole pattern

Detailed Description

The Brembo PRIME 09.D394.21 rotor is engineered around a 345 mm outside diameter, 67.50 mm center hole diameter, and 51 mm overall height. Its 28.5 mm discard thickness and 30 mm nominal thickness provide the dimensional profile expected for the listed front brake applications. This part cross-references PowerStop AR82153 and AR82153EVC for the same application.

For Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD front brake service, the rotor’s vented design helps manage heat during repeated stops. The PRIME line focuses on OE-style replacement parts with a corrosion-resistant finish and a smooth working surface for dependable pad contact.

What It Helps Address

• Brake pulsation from worn rotor surfaces
• Reduced braking consistency from heat buildup
• Surface corrosion on exposed brake components
• Rotor wear that has reached discard thickness
• Noise or vibration caused by uneven friction surfaces

Installation Notes and Tips

Verify rotor dimensions, lug pattern, and front axle fitment before installation. Inspect pads, calipers, and hub surfaces during service to help ensure proper rotor seating and braking performance. Confirm the rotor meets the vehicle’s required thickness specifications before reuse or replacement.

Quality Assurance

Brembo PRIME parts are positioned as OE-style replacement components for service applications where fit, finish, and dimensional accuracy matter. Part number 09.D394.21 is supported by the listed fitment data and interchange references for application matching.