Stoptech 127.34052R Disc Brake Rotor - Front Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (part number 127.34052R) are engineered for BMW models including the 330Ci, 330i, 330xi, and Z4. 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.

• Cross-drilled and slotted surface for improved heat dissipation and debris removal
• Vented rotor design to reduce brake fade during extended use
• Coated hat finish to resist corrosion and extend rotor life
• Floating disc mounting for better thermal expansion management
• Compatible with BMW 330Ci, 330i, 330xi, and Z4 models
• Nominal thickness of 0.984 inches (25.000 mm) with discard thickness at 0.921 inches (23.400 mm)
• Overall diameter of 12.795 inches (325.000 mm) and overall height of 2.075 inches (52.700 mm)
• Five lug holes with a 4.724 inch (120.000 mm) bolt circle diameter

Detailed Product Description

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are designed to meet the rigorous demands of BMW drivers who require reliable braking performance. The vented rotor construction features straight vanes that promote efficient airflow, helping to dissipate heat generated during braking. The cross-drilled and slotted surface pattern aids in removing brake dust, gas, and water from the rotor surface, which helps maintain consistent pad contact and reduces the risk of brake fade. The coated hat finish provides corrosion resistance, protecting the rotor’s central mounting area from rust and extending its service life.

With a floating disc mounting design, these rotors accommodate thermal expansion and contraction, reducing the risk of warping under high-temperature conditions. The rotor’s dimensions, including a 12.795 inch (325 mm) outside diameter and 0.984 inch (25 mm) nominal thickness, are optimized for the specified BMW models, ensuring proper fitment and performance.

Compatible Vehicles and Applications

• BMW 330Ci
• BMW 330i
• BMW 330xi
• BMW Z4

This rotor is ideal for drivers looking to replace worn or damaged rotors or upgrade their braking system for improved heat management and consistent stopping power.

Common Issues Addressed by This Rotor

• Brake fade caused by excessive heat buildup during aggressive driving
• Uneven brake pad wear due to poor rotor surface condition
• Corrosion and rust on rotor hats affecting mounting stability
• Reduced braking efficiency in wet conditions due to water accumulation
• Warping or cracking from thermal stress during extended braking

Installation Notes and Tips

• Ensure compatibility with BMW 330Ci, 330i, 330xi, and Z4 models before installation
• Inspect brake pads and replace if worn to maintain optimal braking performance
• Torque mounting bolts to manufacturer specifications to avoid rotor distortion
• Check for proper rotor runout after installation to prevent vibration
• Bleed brake system if necessary to remove air and ensure firm pedal feel

Quality Assurance and Warranty

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are manufactured to meet strict quality standards, ensuring durability and consistent performance. The coated hat finish protects against corrosion, and the vented design helps maintain structural integrity under heat stress. While specific warranty details are not provided here, StopTech products typically come with manufacturer-backed warranties covering defects in materials and workmanship.