Stoptech 126.34077SR Disc Brake Rotor - Front Right

StopTech Sport Slotted Disc Brake Rotors Overview

The StopTech Sport Slotted Disc Brake Rotors (Part Number 126.34077SR) are engineered for BMW models including the 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi. Designed to enhance braking performance, these rotors feature a vented and slotted surface to improve heat dissipation and maintain consistent stopping power under demanding conditions.

• Compatible with BMW 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi models
• Part Number: 126.34077SR
• Vented disc design with straight vane style for efficient cooling
• Slotted surface type to reduce brake fade and improve pad bite
• Coated hat finish for corrosion resistance
• Floating disc mounting for better thermal expansion management
• Outside diameter: 299.8 mm (11.803 inches)
• Nominal thickness: 24.0 mm (0.945 inches), discard thickness: 22.4 mm (0.882 inches)
• 5 lug holes with 120 mm bolt circle diameter
• Overall height: 73.8 mm (2.906 inches)
• Weight approximately 8.02 kg (17.65 lbs)

Detailed Product Description

The StopTech Sport Slotted Disc Brake Rotors are precision-engineered replacement rotors designed specifically for select BMW models. Featuring a vented rotor design with straight vanes, these rotors promote optimal airflow to dissipate heat generated during braking. The slotted surface helps to evacuate gases, dust, and debris from the brake pad surface, improving pad contact and reducing brake fade during aggressive driving or track use.

The rotor’s hat is coated to resist corrosion, extending the service life and maintaining appearance. The floating disc mounting design allows for controlled thermal expansion, reducing the risk of warping under high temperature conditions. With a nominal thickness of 24.0 mm and a discard thickness of 22.4 mm, these rotors provide a durable and reliable braking surface. The 5-lug hole pattern with a 120 mm bolt circle diameter ensures proper fitment on compatible BMW models.

StopTech Sport Slotted Disc Brake Rotors Product Line

The StopTech Sport Slotted Disc Brake Rotors line is designed for drivers seeking improved braking performance without compromising OEM fitment. This product line focuses on enhanced heat dissipation and consistent braking feel through features like slotted surfaces and vented rotor construction. The 126.34077SR rotor exemplifies this approach by combining durability with performance-oriented design elements suitable for both street and light track use on BMW vehicles.

Common Applications and Problem Solving

• Reduces brake fade during spirited driving or track sessions
• Improves pad bite and braking response with slotted rotor surface
• Minimizes rotor warping through vented design and floating mounting
• Resists corrosion with coated hat finish for longer service life
• Restores braking performance on BMW 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi models

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (22.4 mm) before installation
• Use proper torque specifications for 5-lug mounting with 120 mm bolt circle
• Inspect brake pads and replace if worn to optimize rotor performance
• Clean rotor surface before installation to remove any protective coatings or debris
• Check for ABS tone ring compatibility; this rotor does not include an ABS tone ring

Quality Assurance and Warranty

StopTech Sport Slotted Disc Brake Rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The coated hat finish and vented design contribute to long-term durability and consistent braking performance. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. It is recommended to verify warranty terms with the retailer or manufacturer.