Bosch QuietCast Rear Disc Brake Rotor 309mm Single — Precision-balanced, Corrosion-resistant

The BOSCH QuietCast Premium 309mm rear disc brake rotor is a factory-balanced, corrosion-resistant replacement rotor engineered for smooth stopping and quiet operation on compatible Lexus, Toyota, and select vehicles.

When replacing rear rotors, choosing a direct-fit, precision-made component matters for pedal feel, ABS performance, and longevity. This Bosch QuietCast rotor is sized to 309mm and sold as a single rear unit; it is manufactured with OEM-style vane geometry, corrosion-resistant coating, and factory milling to reduce vibration and deliver consistent stopping performance that matches or improves on many original equipment parts.

How does this rotor reduce noise and vibration?

The rotor is precision-milled and dynamically balanced at the factory to minimize pedal pulsation and vibrational noise. Bosch uses vane and mass distribution that reduces harmonic excitation under braking, so stops feel smoother and sound quieter.

• Factory mill precision balancing disperses weight evenly
• OEM-style vane layout improves heat flow and lowers vibration
• Surface finish optimized for pad-to-rotor contact consistency

What protects the rotor from rust and extends service life?

An aluminum/zinc protective coating covers exposed surfaces to guard against corrosion while maintaining a clean appearance for modern open-wheel designs. The finish slows rust formation on the hat and outer edge, helping maintain fit and function over time.

• Aluminum/zinc coating prevents surface rust
• Corrosion resistance preserves mounting surfaces and hub fitment
• Clean visual finish for aftermarket wheels and aesthetics

Will this rotor work with ABS and traction control systems?

Where required, Bosch installs an OEM-style ABS tone ring into the rotor so wheel speed sensors continue to read accurately. That ensures compatibility with anti-lock and traction control systems without additional parts or calibration.

• Integrated OEM-style ABS tone ring on applicable applications
• Maintains correct sensor signaling for traction and braking systems
• Direct-fit design avoids sensor interference or false readings

How do I know when the rotor needs replacing again?

Every QuietCast rotor carries an engraved discard thickness mark that provides a clear visual indicator when the rotor has worn to its service limit. Bosch also brands the part directly on the rotor so you can verify authenticity during inspection and install.

• Engraved discard thickness marking for simple wear checks
• On-the-part Bosch branding confirms genuine replacement part
• Sold as a single rear rotor sized at 309mm for correct fitment

Who this is for: Drivers and DIY mechanics seeking a dependable, direct-fit rear rotor replacement for compatible Lexus RX350/RX450h and select Toyota Highlander and Sienna models. This rotor is appropriate for owners who prioritize quieter braking, corrosion resistance, and OEM-style fitment for safe ABS function. Choose Bosch QuietCast when you want an authentic, factory-balanced rotor that simplifies replacement and sustains braking performance without modifying factory systems.