Stoptech 128.34049L Disc Brake Rotor - Rear Left

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotor (Part Number 128.34049L) is engineered for BMW 323i, 325Ci, 325i, 328Ci, and 328i models. Designed to enhance braking performance, this vented rotor features a cross-drilled surface for improved heat dissipation and consistent stopping power.

• Cross-drilled surface type for enhanced cooling
• Vented rotor design to reduce brake fade
• Coated hat finish for corrosion resistance
• Compatible with BMW 323i, 325Ci, 325i, 328Ci, and 328i
• Part Number: 128.34049L
• Overall diameter: 294 mm (11.575 inches)
• Nominal thickness: 19.000 mm (0.748 inches)
• Mounting bolt hole circle diameter: 120 mm (4.724 inches) with 5 lug holes

Detailed Product Description

The StopTech Sport Cross-Drilled Disc Brake Rotors are designed to meet the demands of BMW drivers seeking reliable braking performance. This rotor features a vented design with straight vanes that promote airflow, helping to dissipate heat during aggressive driving or heavy braking conditions. The cross-drilled surface improves water and gas evacuation, reducing the risk of brake fade and maintaining consistent pedal feel.

With a coated hat finish, the rotor resists corrosion, extending its service life. The rotor’s dimensions include an outside diameter of 294 mm (11.575 inches), an overall height of 59.7 mm (2.350 inches), and a nominal thickness of 19.000 mm (0.748 inches). It mounts using a 5-lug pattern with a 120 mm (4.724 inches) bolt circle diameter, compatible with the specified BMW models. The center hole diameter measures 75 mm (2.953 inches), ensuring proper fitment.

About StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed for drivers who require enhanced braking performance without compromising durability. The cross-drilled design aids in heat dissipation and gas release, which is critical for maintaining brake efficiency under demanding conditions. This product line balances performance and longevity, making it suitable for both street and light track use on compatible BMW vehicles.

Common Applications and Problem Solving

• Improves brake cooling to reduce fade during spirited driving
• Enhances stopping power for BMW 323i, 325Ci, 325i, 328Ci, and 328i models
• Reduces brake noise and vibration associated with worn rotors
• Prevents corrosion with coated hat finish for longer rotor life
• Restores proper rotor thickness and surface for consistent braking

Installation Notes and Tips

• Ensure compatibility with BMW 323i, 325Ci, 325i, 328Ci, and 328i before installation
• Check rotor thickness and discard thickness limits: nominal thickness 19.000 mm, discard thickness 17.400 mm
• Use proper torque specifications for the 5-lug mounting pattern with 120 mm bolt circle diameter
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Clean rotor surface before installation to remove any protective coatings or residues

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards for fitment and performance. While specific warranty details are not provided here, StopTech products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Always verify warranty terms with the product documentation or authorized sources.