Stoptech 126.44090SR Disc Brake Rotor - Rear Right

StopTech Sport Slotted Disc Brake Rotors Overview

The StopTech Sport Slotted Disc Brake Rotors (Part Number 126.44090SR) are engineered for Lexus GS300, GS400, GS430, IS300, and SC430 models. Designed to provide consistent braking performance, these rotors feature a slotted surface and solid construction to enhance heat dissipation and reduce brake fade under demanding conditions.

• Compatible with Lexus GS300, GS400, GS430, IS300, and SC430
• Part Number: 126.44090SR
• Slotted surface type for improved brake pad bite and debris removal
• Solid rotor design with coated hat finish for corrosion resistance
• Outside diameter: 12.087 inches (307 mm)
• Nominal thickness: 0.472 inches (12.000 mm), discard thickness: 0.413 inches (10.500 mm)
• Overall height: 2.492 inches (63.300 mm)
• 5 lug holes with 4.5 inch (114.3 mm) bolt circle diameter

StopTech Sport Slotted Disc Brake Rotors Product Line

The StopTech Sport Slotted Disc Brake Rotors line is designed to meet the needs of drivers seeking enhanced braking performance without modifying their vehicle’s original brake system. The slotted design improves pad bite and helps evacuate gases and debris, which can improve braking consistency during spirited driving or daily use. The solid rotor construction paired with a coated hat finish offers durability and corrosion resistance, making it suitable for Lexus models such as the GS300, GS400, GS430, IS300, and SC430.

Technical Specifications and Features

This rotor features a nominal thickness of 0.472 inches (12.000 mm) and a discard thickness of 0.413 inches (10.500 mm), ensuring a reliable service life before replacement is necessary. The outside diameter measures 12.087 inches (307 mm), with an overall height of 2.492 inches (63.300 mm). The rotor includes five lug holes with a 4.5 inch (114.3 mm) bolt circle diameter and a center hole diameter of 2.441 inches (62 mm). The solid rotor design provides consistent braking performance, while the slotted surface enhances pad cleaning and heat dissipation. Note that this rotor does not include an ABS tone ring or bearings.

Applications and Problem Solving

• Improves braking response and reduces brake fade on Lexus GS300, GS400, GS430, IS300, and SC430
• Helps prevent brake pad glazing and uneven wear through slotted surface design
• Reduces heat buildup during aggressive driving or towing conditions
• Addresses rotor corrosion with coated hat finish for extended rotor life
• Maintains factory fitment and bolt pattern for straightforward replacement

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.413 inches) before installation
• Use proper torque specifications for the 5 lug bolts on the 4.5 inch bolt circle
• Inspect brake pads and replace if worn to optimize rotor performance
• Clean rotor surface before installation to remove any protective coatings or debris
• Check compatibility with vehicle ABS system as this rotor does not include an ABS tone ring

Quality Assurance and Warranty

StopTech Sport Slotted Disc Brake Rotors are manufactured to meet OEM standards for fit, form, and function. The coated hat finish provides corrosion resistance to extend rotor life. While specific warranty details are not provided, StopTech products typically come with a limited warranty against defects in materials and workmanship. Always verify warranty terms with the product documentation or manufacturer.