Stoptech 127.34131R Disc Brake Rotor - Rear Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34131R) are engineered for BMW 528i, 528i xDrive, 535d, 535d xDrive, 535i, 535i xDrive, and ActiveHybrid 5 models. These rotors provide enhanced braking performance through advanced vented design and precision machining.

• Cross-drilled and slotted surface for improved heat dissipation and brake pad cleaning
• Vented rotor design to reduce brake fade under heavy use
• Coated hat finish to resist corrosion and extend rotor life
• Nominal thickness of 0.787 inches (20.000 mm) with discard thickness at 0.724 inches (18.400 mm)
• Outside diameter of 12.992 inches (330.000 mm) for optimal fitment
• Designed with 5 lug holes and a mounting bolt hole circle diameter of 4.724 inches (120.000 mm)
• Center hole diameter of 2.953 inches (75.000 mm) for precise hub alignment
• Weight approximately 16.2 lbs (7.36 kgs) per rotor

Detailed Product Description

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are specifically designed for select BMW 5 Series models, including the 528i, 535i, and 535d variants with or without xDrive, as well as the ActiveHybrid 5. Featuring a vented rotor construction, these rotors help maintain consistent braking performance by efficiently dissipating heat generated during braking. The cross-drilled and slotted surface pattern aids in removing brake dust and gases, which can otherwise reduce pad contact and braking efficiency.

The rotors have a coated hat finish that protects against rust and corrosion, ensuring durability in various driving conditions. With a nominal thickness of 0.787 inches and a discard thickness of 0.724 inches, these rotors meet strict specifications for safe and reliable operation. The precise dimensions, including a 12.992-inch outside diameter and a 5-lug hole pattern, ensure proper fitment on compatible BMW models.

About StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to offer improved braking performance for street and light track use. This product line focuses on enhancing rotor cooling and pad bite through the use of cross-drilled holes and slots, combined with a vented rotor design. The coated hat finish adds corrosion resistance, making these rotors suitable for daily driving conditions while maintaining performance benefits.

Common Applications and Problem Solving

• Reduces brake fade during aggressive driving or towing
• Improves brake pad cleaning to maintain consistent friction
• Enhances heat dissipation to prevent rotor warping
• Minimizes corrosion on rotor hats for longer service life
• Provides reliable fitment for BMW 528i, 535i, 535d, and ActiveHybrid 5 models

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.724 inches) before installation
• Clean mounting surfaces and hub to prevent runout
• Torque lug nuts to manufacturer specifications for BMW 5 Series
• Check compatibility with ABS systems; this rotor does not include an ABS tone ring
• Use proper brake pads recommended for cross-drilled and slotted rotors

Quality Assurance and Warranty

StopTech rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The vented design and corrosion-resistant coating contribute to long-term durability. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Always verify warranty terms with the product supplier or manufacturer.