Perfect Stop 6621000 Disc Brake Rotor - Front

Overview of Perfect Stop Gray Armor-Plate Premium Rotor

The Perfect Stop Gray Armor-Plate, Premium disc brake rotor (part number 6621000) is engineered for reliable braking performance on Chevrolet Cobalt and HHR models. Designed with vented construction and a smooth surface, this rotor supports effective heat dissipation and consistent stopping power.

• Compatible with Chevrolet Cobalt and HHR vehicles
• Vented disc brake rotor design for improved cooling
• Overall diameter of 12.421 inches (315.5 mm)
• Nominal thickness of 1.008 inches (25.6 mm) with discard thickness at 0.945 inches (24.0 mm)
• Five mounting bolt holes with a 4.331 inch (110.0 mm) bolt circle diameter
• Center hole diameter of 2.579 inches (65.5 mm)
• Surface type: smooth, no ABS tone ring included

About the Gray Armor-Plate, Premium Product Line

The Gray Armor-Plate, Premium line from Perfect Stop focuses on delivering durable rotors with enhanced surface protection. This product line features a premium coating designed to resist corrosion and extend rotor life, making it suitable for drivers seeking dependable braking components for their Chevrolet Cobalt or HHR. The vented rotor design in this line helps maintain optimal operating temperatures during braking.

Detailed Product Description

This disc brake rotor, part number 6621000, is specifically manufactured to meet the specifications required by Chevrolet Cobalt and HHR models. The rotor's vented design allows air to flow between the rotor surfaces, reducing heat buildup and minimizing brake fade during extended use. With a smooth surface finish, it ensures consistent pad contact and braking efficiency. The rotor measures 12.421 inches in outside diameter and has a nominal thickness of 1.008 inches, with a discard thickness of 0.945 inches, indicating when replacement is necessary. The five mounting bolt holes and 4.331 inch bolt circle diameter provide secure fitment, while the 2.579 inch center hole diameter aligns precisely with the vehicle hub.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on Chevrolet Cobalt and HHR
• Addresses brake noise and vibration caused by uneven rotor surfaces
• Helps reduce brake fade during heavy or prolonged braking
• Prevents corrosion-related rotor damage with premium coating
• Restores proper rotor thickness for safe braking performance

Installation Notes and Tips

Ensure the rotor surface is clean and free of debris before installation. Verify the rotor thickness is above the discard thickness of 0.945 inches to maintain safety standards. Use the correct torque specifications for the five mounting bolts to avoid rotor warping. This rotor does not include an ABS tone ring, so confirm compatibility with your vehicle's braking system. Proper bedding-in of new rotors and pads is recommended to optimize braking performance.

Quality Assurance

Perfect Stop rotors undergo rigorous quality control to meet OEM standards for fit and function. The Gray Armor-Plate, Premium rotors feature a corrosion-resistant coating to extend service life. While specific warranty details are not provided, Perfect Stop products are designed to comply with industry standards for durability and performance.