Stoptech 128.34052R Disc Brake Rotor - Front Right

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.34052R) are engineered for BMW models including the 330Ci, 330i, 330xi, and Z4. Designed to enhance braking performance, these rotors feature a vented and cross-drilled surface to improve heat dissipation and reduce brake fade under demanding conditions.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design to maintain optimal operating temperatures
• Coated hat finish for corrosion resistance
• Floating disc mounting for better rotor alignment
• Compatible with BMW 330Ci, 330i, 330xi, and Z4 models
• Part Number: 128.34052R

Detailed Product Features and Specifications

The StopTech Sport Cross-Drilled Disc Brake Rotors are constructed with a vented design featuring straight vanes that promote efficient airflow and cooling. The cross-drilled surface pattern helps to reduce heat buildup and improve wet-weather braking by allowing water to escape from the rotor surface. The rotor has a nominal thickness of 0.984 inches (25.000 mm) and a discard thickness of 0.921 inches (23.400 mm), ensuring a long service life before replacement is necessary.

The rotor's overall height measures 2.075 inches (52.700 mm) with an outside diameter of 12.795 inches (325.000 mm). It includes a coated hat finish to resist corrosion and maintain appearance over time. The center hole diameter is 3.110 inches (79.000 mm), and the mounting bolt hole circle diameter is 4.724 inches (120.000 mm) with five stud/lug holes sized at 0.575 inches (14.600 mm). This rotor uses a floating disc mounting system and includes one miscellaneous hole for additional fitment precision. Weighing approximately 20.32 lbs (9.24 kgs), it balances durability and performance.

About the StopTech Sport Cross-Drilled Disc Brake Rotors Line

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to provide enhanced braking performance for sport and performance vehicles. These rotors combine cross-drilled surfaces with vented construction to optimize heat dissipation and reduce brake fade during aggressive driving or track use. The coated hat finish adds corrosion resistance, making them suitable for daily driving as well as spirited performance applications. This product line is engineered to meet the demands of BMW models such as the 330Ci, 330i, 330xi, and Z4, ensuring reliable fitment and consistent braking performance.

Common Applications and Problem Solving

• Improves brake cooling to reduce fade during spirited driving
• Enhances wet-weather braking performance by dispersing water
• Reduces rotor warping caused by excessive heat buildup
• Restores braking efficiency on BMW 330Ci, 330i, 330xi, and Z4 models
• Addresses corrosion issues with coated hat finish

Installation Notes and Tips

• Ensure compatibility with BMW 330Ci, 330i, 330xi, and Z4 before installation
• Check rotor thickness and discard thickness to confirm replacement necessity
• Use proper torque specifications for mounting bolts on the 5-lug pattern
• Inspect brake pads and calipers during rotor replacement for optimal performance
• Floating disc mounting requires correct alignment for best results

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet strict quality standards for durability and performance. The coated hat finish provides corrosion resistance to extend rotor life. While specific warranty details are not provided here, StopTech products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Always refer to the official StopTech warranty documentation for complete coverage information.