Bosch 34011639 Disc Brake Rotor - Rear

Bosch QuietCast Rear Rotor for Mazda

The Bosch QuietCast Rotor 34011639 is a rear disc brake rotor built for select Mazda applications. With a product height of 1.535433 in, it is a direct-fit brake rotor option for drivers servicing rear brake wear on Mazda 3, Mazda 3 Sport, Mazda CX-3, and Mazda CX-30 models.

Bosch QuietCast Rotor parts are positioned as OE-style brake components for consistent fitment and straightforward replacement. This rotor is listed for rear use on 2014-2025 Mazda 3 and Mazda 3 Sport applications, plus 2019-2025 Mazda CX-3 and Mazda CX-30 rear brake service.

Key Features

• Part number 34011639 rear disc brake rotor
• Product height: 1.535433 in
• Rear brake rotor for select Mazda vehicles
• Bosch QuietCast Rotor line for OE-style replacement fitment
• Cross-reference: B45G26251B

Detailed Description

Use Bosch 34011639 when replacing a worn rear rotor on a Mazda 3, Mazda 3 Sport, Mazda CX-3, or Mazda CX-30. This rotor is cataloged for rear axle applications across model years 2014 through 2025, with fitment varying by vehicle and trim. For shoppers searching for a rear brake rotor for 2019-2025 Mazda 3, a rear disc brake rotor for 2020-2025 Mazda CX-30, or a Bosch QuietCast Rotor for 2014-2018 Mazda 3, this part number provides a direct reference point.

The Bosch QuietCast Rotor line is used for brake service where accurate fit and stable rotor replacement matter. Part number 34011639 is also referenced by B45G26251B for the same application.

What It Helps Address

• Rear rotor wear from normal brake use
• Brake pulsation caused by rotor surface condition
• Reduced braking consistency from an out-of-spec rotor
• Noise or vibration associated with worn rear brake components
• Service needs on Mazda rear brake systems

Installation Notes and Tips

Confirm rear fitment by year, model, and position before ordering. Match Bosch QuietCast Rotor 34011639 to the vehicle’s rear brake application only, and verify rotor dimensions against the existing part during service. For Mazda 3 and Mazda CX-30 rear brake work, inspect pads and related hardware during rotor replacement to ensure the braking system is serviced as a complete assembly.

Quality Assurance

Bosch QuietCast brake components are built for OE-style replacement applications and cataloged with vehicle-specific fitment data for Mazda rear brake service.