PowerStop AR8647 Disc Brake Rotor - Rear

Power Stop Rear OE Stock Replacement Brake Rotor Overview

The Power Stop - Rear OE Stock Replacement Brake Rotor (Part Number AR8647) is engineered to meet the exact specifications of your vehicle's original equipment. Designed for rear disc brake systems, this rotor provides reliable performance for a range of GM and related models, including Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab vehicles.

• Part Number: AR8647
• Compatible with rear disc brake systems on Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models
• Vented disc brake rotor design for improved heat dissipation
• Outside diameter: 12.80 inches (324.00 mm)
• Nominal thickness: 0.79 inches (20.00 mm)
• Discard thickness: 0.73 inches (18.50 mm)
• Overall height: 3.40 inches (85.10 mm)
• Mounting bolt hole circle diameter: 5.00 inches (127.00 mm)
• 6 stud/lug hole quantity
• No rust resistant coating

About the Power Stop - Rear OE Stock Replacement Brake Rotor Line

The Power Stop - Rear OE Stock Replacement Brake Rotor line is designed to provide a direct replacement for original equipment rotors. This product line focuses on matching the exact dimensions and specifications of factory parts to ensure proper fit and function. The AR8647 rotor maintains the vented design typical of OE rear rotors, supporting effective heat dissipation and consistent braking performance for compatible vehicles.

Detailed Product Description

This disc brake rotor is vented to help reduce heat buildup during braking, which is critical for maintaining braking efficiency and rotor longevity. With an outside diameter of 12.80 inches and a nominal thickness of 0.79 inches, the AR8647 rotor fits rear brake assemblies on select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models such as the Trailblazer, Envoy, Ascender, and 9-7x. The rotor features six lug holes with a 5.00-inch bolt circle diameter, ensuring compatibility with the specified vehicles. Note that this rotor does not include a rust resistant coating, so proper maintenance and inspection are recommended to prevent corrosion over time.

Common Applications and Issues Addressed

• Replacement for worn or warped rear brake rotors
• Restores proper rotor thickness to prevent brake pulsation
• Addresses noise or vibration caused by uneven rotor surfaces
• Improves braking consistency on Buick Trailblazer and GMC Envoy models
• Compatible upgrade for rear brake systems on Isuzu Ascender and Saab 9-7x

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.73 inches) before installation
• Clean rotor surface to remove any protective oils or debris prior to mounting
• Check compatibility with vehicle lug pattern: 6 lug holes on a 5.00-inch bolt circle diameter
• Torque lug nuts to manufacturer specifications to avoid rotor warping
• Inspect brake pads and hardware during rotor replacement for optimal performance

Quality Assurance and Warranty

Power Stop manufactures the AR8647 rotor to meet or exceed OEM standards for fit, form, and function. While this product does not include a rust resistant coating, it is built to provide consistent braking performance under normal operating conditions. Warranty coverage details should be confirmed with the product documentation or manufacturer directly.