Stoptech 128.33138L Disc Brake Rotor - Front Left

StopTech Sport Cross-Drilled Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.33138L) are engineered for enhanced braking performance on select Audi and Porsche models. Designed with vented construction and cross-drilled surface, these rotors provide improved heat dissipation and consistent stopping power for vehicles like the Audi A5, A6 Quattro, and Porsche Macan.

• Cross-drilled surface for efficient heat and gas dissipation
• Vented rotor design to reduce brake fade
• Coated hat finish for corrosion resistance
• Floating disc mounting for improved rotor alignment
• Compatible with 5-lug wheel setups
• Precision fit for Audi A5, A6, A6 Quattro, A7 Quattro, S4, S5 and Porsche Macan, Q5

Product Line Details: StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line focuses on delivering rotors with enhanced thermal management and durability. Featuring a cross-drilled surface combined with vented construction, this product line is designed to maintain consistent braking performance under demanding conditions. The coated hat finish helps protect against corrosion, extending rotor life. This part number 128.33138L is a part of this line, offering a floating disc mounting system and pillar-style vanes to optimize airflow and cooling.

Technical Specifications and Features

These rotors have a nominal thickness of 30.000 mm (1.181 inches) and a discard thickness of 28.000 mm (1.102 inches), ensuring a long service life before replacement is necessary. The outside diameter measures 345.000 mm (13.583 inches), with an overall height of 52.100 mm (2.051 inches). The center hole diameter is 68.000 mm (2.677 inches), and the mounting bolt hole circle diameter is 112.000 mm (4.409 inches) with 5 lug holes sized at 15.300 mm (0.602 inches). The rotors weigh approximately 11.56 kg (25.5 lbs) each. The pillar vane style enhances cooling efficiency by promoting airflow between the rotor surfaces.

Applications and Problem Solving

• Improves brake cooling to reduce fade during spirited driving or towing
• Helps maintain consistent pedal feel under heavy braking
• Reduces rotor warping caused by excessive heat buildup
• Prevents corrosion on the rotor hat area with coated finish
• Compatible with ABS systems that do not require tone rings

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness before installation
• Verify compatibility with vehicle make and model, specifically Audi A5, A6, A6 Quattro, A7 Quattro, S4, S5 and Porsche Macan, Q5
• Use proper torque specifications for mounting bolts on the 5-lug pattern
• Inspect brake pads and calipers for wear during rotor replacement
• Floating disc mounting requires correct alignment for optimal performance

Quality Assurance and Warranty

StopTech rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The coated hat finish provides additional corrosion resistance to extend rotor life. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Always consult the product documentation or manufacturer for exact warranty terms.