Stoptech 128.34133L Disc Brake Rotor - Rear Left

StopTech Rear Left Cross-Drilled Rotor

The StopTech Sport Cross-Drilled Disc Brake Rotor, part number 128.34133L, is a direct replacement disc for factory brake systems and stock calipers. It is built for the rear left position and uses an X-drilled surface to improve heat and brake dust dispersal while helping reduce pad glazing.

For BMW drivers looking for a rear brake rotor upgrade that keeps OE-style fitment, this StopTech rotor combines a coated hat finish with vented construction and high-carbon metallurgy in most applications. The result is a rotor that supports quieter operation, improved crack resistance, and more consistent wet and dry braking response.

Key Features

• Part number 128.34133L for the rear left brake position
• StopTech Sport Cross-Drilled Disc Brake Rotors line
• 1-piece direct replacement rotor for factory brake systems
• X-drilled surface helps move heat and brake dust away from the braking surface
• Helps reduce pad glazing and improve initial bite
• Black e-coating helps protect against corrosion
• High-carbon metallurgy in most applications for quieter operation and added crack resistance
• Vented rotor design with coated hat finish
• Outside diameter: 345 mm; nominal thickness: 23.8 mm; discard thickness: 22.4 mm

Product Details

The StopTech Sport Cross-Drilled Disc Brake Rotors line is aimed at drivers who want a direct-fit rotor with a performance-oriented surface treatment and OE-style installation. This rotor measures 345 mm in outside diameter, 23.8 mm nominal thickness, and 22.4 mm discard thickness, with a 75 mm center hole diameter and 5-lug mounting pattern. It is engineered for BMW rear left applications and is listed for 2010-2018 BMW 535i, 535i GT, 535i GT xDrive, 550i, 550i xDrive, 640i, 640i xDrive, 650i, 650i xDrive, 740i, 740Li, 740Ld xDrive, ActiveHybrid 7, and related Gran Coupe models. If you are searching for a BMW 640i rear left brake rotor, BMW 550i rear left disc brake rotor, or a 2011-2015 BMW 740Li rear left replacement rotor, part number 128.34133L matches those applications.

This part cross-references StopTech 128.34133L for the same application.

Common Problems This Rotor Addresses

• Brake fade from heat buildup during repeated stops
• Pad glazing that can reduce braking response
• Corrosion on exposed rotor surfaces
• Uneven wet-weather braking feel
• Noise and vibration associated with worn rear rotors

Installation Notes and Tips

Install this rotor on the rear left position only and verify rotor dimensions, hub fitment, and lug pattern before assembly. Clean the hub face thoroughly, inspect pads and caliper hardware for wear, and confirm the rotor runs true after installation. Because this is a vented, cross-drilled rotor for factory brake systems, proper bedding-in of new pads and rotors is important for stable performance.

Quality Assurance

StopTech builds this rotor with a corrosion-resistant black e-coating and high-carbon metallurgy in most applications to support durability, crack resistance, and quieter braking performance. It is a direct replacement brake disc intended for stock calipers and OE-style brake service.

• Fits 2012-2018 BMW 640i, Rear Left
• Fits 2013-2018 BMW 640i Gran Coupe, Rear Left
• Fits 2014-2018 BMW 640i xDrive, Rear Left
• Fits 2014-2018 BMW 640i xDrive Gran Coupe, Rear Left
• Fits 2012-2018 BMW 650i, Rear Left
• Fits 2013-2018 BMW 650i Gran Coupe, Rear Left
• Fits 2012-2018 BMW 650i xDrive, Rear Left
• Fits 2013-2018 BMW 650i xDrive Gran Coupe, Rear Left
• Fits 2010-2017 BMW 535i GT, Rear Left
• Fits 2011-2017 BMW 535i GT xDrive, Rear Left
• Fits 2011-2016 BMW 550i, Rear Left
• Fits 2011-2016 BMW 550i xDrive, Rear Left
• Fits 2011-2015 BMW 740i, Rear Left
• Fits 2015 BMW 740Ld xDrive, Rear Left
• Fits 2011-2015 BMW 740Li, Rear Left
• Fits 2013-2015 BMW 740Li xDrive, Rear Left
• Fits 2013-2015 BMW ActiveHybrid 7, Rear Left
• Fits 2011-2013 BMW 535i, Rear Left