PowerStop AR8638 Disc Brake Rotor - Front

Power Stop Front OE Stock Replacement Brake Rotor Overview

The Power Stop - Front OE Stock Replacement Brake Rotor AR8638 is engineered for reliable braking performance on select Chevrolet, GMC, Isuzu, and Oldsmobile vehicles. Designed as a direct replacement for front disc brake rotors, this vented rotor meets original equipment specifications to maintain consistent stopping power and vehicle safety.

• Part Number: AR8638
• Vented disc brake rotor design for improved heat dissipation
• Outside diameter: 274.00 mm (10.80 inches)
• Nominal thickness: 28.90 mm (1.14 inches)
• Discard thickness: 27.50 mm (1.08 inches)
• Overall height: 54.70 mm (2.20 inches)
• Mounting bolt hole circle diameter: 120.70 mm (4.80 inches)
• 5 stud/lug hole quantity
• No rust resistant coating

Detailed Product Description

The AR8638 rotor from Power Stop is a vented disc brake rotor designed to replace front OE stock rotors on compatible vehicles including Chevrolet Blazer, GMC Jimmy, Isuzu Hombre, Oldsmobile Bravada, and Chevrolet S10 and Sonoma models. The vented design helps dissipate heat generated during braking, reducing the risk of brake fade and maintaining consistent braking performance. With an outside diameter of 274 mm and a nominal thickness of 28.90 mm, this rotor fits precisely within factory specifications. The discard thickness of 27.50 mm indicates the minimum safe thickness before replacement is necessary, ensuring safety and reliability. The rotor features a 5-lug hole pattern with a mounting bolt hole circle diameter of 120.70 mm, matching the OE fitment requirements for the listed vehicles.

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

The Power Stop - Front OE Stock Replacement Brake Rotor product line focuses on providing direct OE replacement rotors that meet factory specifications for fit, form, and function. This line is designed to offer a straightforward replacement option for front disc brake rotors, ensuring compatibility and reliable braking performance without modifications. The AR8638 rotor is part of this line, engineered to maintain the original braking characteristics of the vehicle.

Common Applications and Issues Addressed

• Replacement for worn or warped front brake rotors on Chevrolet Blazer and GMC Jimmy
• Restores braking performance on Isuzu Hombre and Oldsmobile Bravada with front disc brakes
• Solves issues related to brake pulsation and noise caused by rotor wear
• Addresses rotor thickness below manufacturer discard limits
• Improves heat dissipation to reduce brake fade during regular driving conditions

Installation Notes and Tips

• Ensure rotor thickness is measured before installation to confirm discard limits
• Clean rotor surface and hub mounting area to prevent uneven rotor seating
• Torque lug nuts to manufacturer specifications to avoid rotor warping
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Follow vehicle-specific service manual instructions for rotor replacement

Quality Assurance and Warranty

Power Stop manufactures the AR8638 rotor to meet or exceed OE standards for durability and performance. While this rotor does not include a rust resistant coating, it is engineered for consistent braking under normal operating conditions. Warranty coverage details should be confirmed with the manufacturer or authorized distributor.