Perfect Stop 6621922 Disc Brake Rotor - Front

Overview of Perfect Stop Gray Armor-Plate, Premium Disc Brake Rotor

The Perfect Stop Gray Armor-Plate, Premium disc brake rotor (Part Number 6621922) is engineered for reliable braking performance on select Buick, Chevrolet, and GMC models. Designed specifically for vehicles like the Buick Envision, Chevrolet Equinox, and GMC Terrain, this rotor meets precise specifications to ensure proper fit and function.

• Vented disc brake rotor for improved heat dissipation
• Outside diameter of 12.638 inches (321.0 mm)
• Nominal thickness of 1.102 inches (28.0 mm) with discard thickness at 1.024 inches (26.0 mm)
• Overall height of 1.791 inches (45.5 mm)
• Five mounting bolt holes with a bolt circle diameter of 4.528 inches (115.0 mm)
• Smooth surface type for consistent pad contact
• Center hole diameter of 2.783 inches (70.7 mm)
• ABS tone ring not included

Product Line Details: Gray Armor-Plate, Premium

The Gray Armor-Plate, Premium line from Perfect Stop focuses on delivering durable rotors with enhanced surface protection. This product line features rotors with a smooth surface finish and vented design to optimize braking efficiency and heat management. The premium coating helps resist corrosion, extending rotor life and maintaining performance over time.

Technical Specifications and Compatibility

This disc brake rotor is vented to allow better airflow and heat dissipation, which helps reduce brake fade during extended use. The nominal thickness of 1.102 inches (28.0 mm) and discard thickness of 1.024 inches (26.0 mm) provide clear service limits for maintenance. The rotor’s overall height of 1.791 inches (45.5 mm) and outside diameter of 12.638 inches (321.0 mm) ensure proper alignment and fitment on compatible vehicles. It features five mounting bolt holes arranged on a 4.528-inch (115.0 mm) bolt circle diameter, matching factory specifications for Buick Envision, Chevrolet Equinox, LaCrosse, Regal Sportback, Regal TourX, and GMC Terrain models.

Common Applications and Problem Solving

• Replacement for worn or warped rotors causing brake pulsation
• Addressing rotor thickness below discard limits to maintain braking safety
• Improving heat dissipation to reduce brake fade on SUVs and crossovers
• Restoring smooth braking surface for consistent pad contact and reduced noise
• Ensuring proper rotor fitment on Buick, Chevrolet, and GMC vehicles listed

Installation Notes and Tips

When installing the Perfect Stop Gray Armor-Plate, Premium rotor (Part Number 6621922), ensure the mounting surface is clean and free of debris. Verify rotor thickness before installation to confirm it meets minimum discard thickness. Use proper torque specifications for the five mounting bolts to avoid rotor warping. Since this rotor does not include an ABS tone ring, confirm compatibility with your vehicle’s ABS system. Always replace rotors in pairs to maintain balanced braking performance.

Quality Assurance

Perfect Stop rotors undergo rigorous quality control to meet OEM standards. The Gray Armor-Plate, Premium line is designed for durability and consistent performance under normal operating conditions. While specific warranty details are not provided, Perfect Stop products typically adhere to industry quality benchmarks to ensure reliability and safety.