Stoptech 127.40090L Disc Brake Rotor - Front Left

Overview of StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.40090L) are engineered for Acura MDX and TLX models. Designed to enhance braking performance, these rotors feature a vented, slotted, and cross-drilled surface to improve heat dissipation and maintain consistent stopping power under demanding conditions.

• Compatible with Acura MDX and TLX vehicles
• Part Number: 127.40090L
• Vented disc brake rotor with cross-drilled and slotted surface
• Coated hat finish for corrosion resistance
• Floating disc mounting design
• Outside diameter: 320 mm (12.598 inches)
• Nominal thickness: 28.000 mm (1.102 inches)
• Discard thickness: 26.000 mm (1.024 inches)
• 5 lug holes with 114.2 mm (4.496 inches) bolt circle diameter
• Weight approximately 8.9 kg (19.6 lbs)

Product Line Details

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to provide improved braking performance through enhanced rotor cooling and pad bite. The cross-drilled holes and slots help evacuate gases, dust, and water from the rotor surface, reducing brake fade and maintaining consistent pedal feel. This product line is suitable for drivers seeking reliable braking upgrades for their Acura MDX or TLX without altering the original braking system architecture.

Technical Specifications and Features

This vented rotor features a floating disc mounting design that allows for slight movement between the rotor and hat, reducing stress and improving heat dissipation. The rotor’s coated hat finish protects against corrosion, extending service life. With a 320 mm outside diameter and a nominal thickness of 28 mm, these rotors meet OEM fitment requirements. The 5-lug hole pattern with a 114.2 mm bolt circle diameter ensures proper fitment on compatible Acura MDX and TLX models. The rotor includes 44 straight vanes for efficient airflow and cooling.

Applications and Problem Solving

• Reduces brake fade during extended or aggressive braking
• Improves heat dissipation to prevent rotor warping
• Enhances wet weather braking performance by channeling water away
• Minimizes brake dust buildup on rotor surface
• Maintains consistent brake pedal feel under heavy use

Installation Notes and Tips

Ensure compatibility with Acura MDX and TLX models before installation. Verify rotor thickness and discard thickness to confirm replacement necessity. Use proper torque specifications for lug nuts and mounting bolts. It is recommended to replace brake pads simultaneously to optimize braking performance. Inspect related components such as wheel bearings and calipers during installation.

Quality Assurance and Warranty

StopTech rotors are manufactured to meet or exceed 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 here, StopTech products typically come with a limited warranty against manufacturing defects. Consult product documentation or manufacturer resources for exact warranty terms.