Bilstein 35-115939 Suspension Strut Assembly - Front Left

Bilstein B8 Performance Plus Front Left Strut

The Bilstein B8 Performance Plus front left suspension strut is built for BMW 128i, 135i, and 135is models that use lowering springs. Part number 35-115939 pairs application-specific valving with a monotube design to sharpen handling response and support a sportier stance.

Finished in Bilstein yellow paint with a blue bellows boot, this B8 Performance Plus damper is engineered as an OE upgrade for lowered setups. It is a direct choice for drivers searching for a front left strut for 2008-2013 BMW 128i or 135i applications, including the 2013 BMW 135is.

Key Features

• Bilstein B8 Performance Plus series for lowered suspension setups
• Monotube internal design for consistent damping response
• Application-specific valve settings tuned for performance use
• Front left suspension strut assembly
• Blue bellows boot included
• Yellow paint finish
• Upper mount type: stem
• Lower mount type: base cup

Product Details

Bilstein B8 Performance Plus dampers are designed as a performance-focused replacement for OE dampers when paired with aftermarket lowering springs. The monotube construction helps maintain controlled damping, while the valving is matched to the application to improve handling balance and road feel. For BMW 128i and BMW 135i owners, part number 35-115939 provides a front left solution that supports a lowered ride height without sacrificing the precision expected from Bilstein shock absorbers.

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

What It Helps Address

• Excessive body roll after lowering the suspension
• Reduced damping control with aftermarket lowering springs
• Front-end instability during cornering
• Uneven ride quality from worn OE struts
• Loss of steering response on lowered BMW 128i and 135i models

Installation Notes

• Fits 2008-2013 BMW 128i, front left.
• Fits 2008-2013 BMW 135i, front left.
• Fits 2013 BMW 135is, front left.
• Use with aftermarket lowering springs as specified by the B8 Performance Plus line.
• Confirm suspension configuration and side before installation.

Quality Assurance

Bilstein tests each damper to meet or exceed OE standards. The B8 Performance Plus line is built around the brand’s performance suspension engineering and is backed by Bilstein quality standards for consistent fitment and function.