DuraGo BR900934 Disc Brake Rotor - Front

Durable Disc Brake Rotor for BMW 5 and 6 Series

The DuraGo BR900934 disc brake rotor is engineered for reliable braking performance on select BMW models. Designed with a composite construction featuring a cast iron braking surface and an aluminum hat, this rotor balances strength and weight for consistent stopping power.

• Composite construction with cast iron friction surface and aluminum hat
• Vented rotor design for improved heat dissipation
• Nominal thickness of 1.18 inches (30 mm) with discard thickness at 1.12 inches (28.4 mm)
• Outside diameter of 13.7 inches (348 mm) suitable for BMW 535i, 545i, 550i, 645Ci, and 650i
• Five mounting bolt holes with a 4.72 inch (120 mm) bolt circle diameter
• Non-directional brake surface for versatile installation
• Conventional solid rotor type without cross-drilling or slots

Technical Details and Construction

The BR900934 rotor features a composite design combining a durable cast iron braking surface with a lightweight aluminum hat. This combination helps reduce unsprung weight while maintaining structural integrity. The vented rotor design enhances cooling by allowing air to flow between the rotor faces, reducing the risk of brake fade during extended use. With a nominal thickness of 1.18 inches and a discard thickness of 1.12 inches, this rotor meets OEM specifications for thickness and wear limits. The rotor's overall height measures 3.03 inches (77 mm), and it includes five mounting bolt holes with a 0.57 inch (14.6 mm) diameter, arranged on a 4.72 inch (120 mm) bolt circle diameter. The center hole diameter is 3.11 inches (79 mm), ensuring proper fitment on compatible BMW hubs.

Compatible BMW Models and Applications

This DuraGo disc brake rotor is compatible with the following BMW models:

• BMW 535i
• BMW 545i
• BMW 550i
• BMW 645Ci
• BMW 650i

It is designed to replace original equipment rotors on these vehicles, providing consistent braking performance for daily driving and highway use.

Common Issues Addressed by This Rotor

• Brake rotor warping causing vibration during braking
• Excessive rotor wear leading to reduced braking efficiency
• Overheating and brake fade from insufficient heat dissipation
• Corrosion and surface damage affecting rotor lifespan
• Uneven braking due to rotor surface irregularities

Installation Notes and Tips

• Ensure the rotor thickness is above the discard thickness before installation
• Clean the rotor surface to remove any protective coatings or contaminants
• Torque mounting bolts to manufacturer specifications to avoid rotor distortion
• Inspect brake pads and replace if worn to ensure optimal rotor performance
• Check hub surface for rust or debris to ensure proper rotor seating

Quality Assurance and Warranty

DuraGo brake rotors are manufactured to meet or exceed OEM standards for fit, form, and function. While this product does not include a rust-resistant coating, the composite construction and material selection provide durability under normal operating conditions. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.