Stoptech 227.34019L Disc Brake Rotor - Rear Left

StopTech Select Sport Rear Left Rotor

The StopTech Select Sport Cross-Drilled & Slotted Disc Brake Rotor, part number 227.34019L, is built for drivers who want a direct-fit rear left rotor with added bite and a cleaner performance look. It is compatible with select BMW 3 Series applications, including 1991 BMW 318i, 318is, 325i, 325is, and 325iX rear left positions, plus 1984-1990 BMW 325e, 325es, 325i, and 325is rear left applications.

StopTech Select Sport rotors combine cross-drilled and slotted surface machining with a zinc-coated finish to help resist corrosion and maintain service life. The 227.34019L rotor is sized for the listed applications and supports consistent braking performance in everyday street use.

Key Features

• Cross-drilled and slotted surface for improved initial pad bite
• Zinc coating for added corrosion protection
• Direct-fit disc brake rotor for the rear left position
• Solid rotor design with a 10.157 in. outside diameter
• 4-lug pattern with 3.937 in. bolt circle diameter
• Center hole diameter: 2.441 in.
• Nominal thickness: 0.394 in.; discard thickness: 0.331 in.
• Part number 227.34019L for application matching

Product Details

The StopTech Select Sport line focuses on drilled and slotted brake rotors that improve rotor surface engagement while also enhancing appearance behind the wheel. For BMW 318i, 318is, 325i, 325is, 325iX, 325e, and 325es rear left applications, this rotor is built to match the listed dimensions and mounting layout. The floating/DIH disc mounting style, 4-stud lug pattern, and 258 mm overall diameter help ensure the correct fit for the specified vehicles. If you are searching for a rear left brake rotor for a 1991 BMW 325i or a 1987-1990 BMW 325is, 227.34019L is the cataloged part number to verify.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Reduced braking response from worn rear rotors
• Surface corrosion on exposed brake rotor faces
• Uneven pad contact caused by rotor wear
• Brake pulsation related to rotor condition
• Outdated rotor appearance on BMW 3 Series brake systems

Installation Notes and Tips

Verify rear left fitment by year, model, and position before ordering. This rotor is listed for 1991 BMW 318i, 318is, 325i, 325is, and 325iX rear left applications to 4/91, as well as 1984-1990 BMW 325e, 325es, 325i, and 325is rear left applications. Confirm rotor dimensions, bolt circle, and center bore against the existing brake setup before installation. Inspect pads, caliper condition, and hub surface during service to support proper rotor seating.

Quality Assurance

StopTech Select Sport rotors are manufactured with a zinc-coated finish to improve corrosion resistance and extend service life. The drilled and slotted design is intended to provide a performance-oriented replacement rotor for the listed BMW applications, with part number 227.34019L used for catalog verification.