KYB Rear Strut Boot, Jounce Bumper, and Bellows

2004–2009 Audi A4 / 2005–2010 Audi A6 / 2007–2009 Audi S4 / 2007–2010 Audi S6

Part #: SB115

Overview

The KYB Rear Strut Boot, Jounce Bumper, and Bellows are essential replacement components designed to restore the integrity and performance of your vehicle's suspension system. Specifically engineered for select Audi models including the A4, A6, S4, and S6 from 2004 to 2010, these parts help maintain proper shock absorber function and protect vital suspension components from dirt, debris, and moisture.

If your vehicle's rear suspension is experiencing noise, uneven ride quality, or visible wear on the original boots or bump stops, replacing these parts can significantly improve ride comfort and prolong the lifespan of your shocks. These components are ideal for enthusiasts performing maintenance or repairs, ensuring your Audi continues to deliver a smooth, controlled driving experience.

Key Features

Designed with durability and ease of installation in mind, the KYB rear boot and bump stop set offers a cost-effective solution for suspension maintenance. The boots are made from high-quality rubber or bellows material that resists cracking and deterioration over time, even under harsh weather conditions. The jounce bumpers are crafted to absorb shocks and prevent metal-to-metal contact, reducing wear on your shocks and suspension arms.

• OEM-quality replacement parts specifically designed for Audi A4, A6, S4, and S6 models from 2004 to 2010
• Constructed from durable rubber and high-grade materials to withstand exposure to elements and road debris
• Easy to install, typically requiring removal of the wheel and suspension components already disassembled during maintenance
• Helps prevent dirt and moisture ingress, protecting shock absorbers and suspension hardware
• Restores proper suspension function, ride quality, and noise reduction
• Ideal for routine maintenance, repairs, or restoring suspension performance after wear or damage

Construction & Design

The KYB rear strut boots, bumpers, and bellows are manufactured with precision to ensure a perfect fit and long-lasting performance. The boots are made from flexible, weather-resistant rubber that maintains elasticity over time, preventing cracks and tears. The jounce bumpers are designed to compress smoothly, absorbing shocks and protecting the suspension components from impact damage. These parts are engineered to match the original equipment specifications, ensuring seamless integration with your vehicle's existing suspension system.

Performance & Sound

While these components do not directly increase horsepower or handling, they play a crucial role in maintaining optimal suspension performance. Properly functioning boots and bumpers help keep your shocks operating smoothly, which translates to improved ride comfort, stability, and noise reduction. Replacing worn or missing parts ensures your suspension responds predictably, enhancing overall driving confidence.

Installation & Fitment

Installing the KYB Rear Strut Boot, Jounce Bumper, and Bellows is straightforward for those familiar with suspension work. Since these parts are typically replaced during shock or strut service, they are designed for a direct, bolt-on replacement. No special tools or modifications are usually required, and the process involves removing the rear wheels and suspension components to access the shocks. If your vehicle's original boots or bump stops are missing, worn out, or damaged, replacing them with these KYB parts is a simple way to restore suspension integrity.

What's Included

• Rear strut boot/bellows
• Jounce bumper
• All necessary hardware and clips for installation

Ideal For

• Owners performing suspension maintenance or repairs on Audi A4, A6, S4, or S6 models from 2004 to 2010
• Enthusiasts seeking to restore original ride quality and noise reduction
• Drivers experiencing suspension noise, uneven ride, or visible wear on existing boots and bump stops

Emissions Note

This product is a replacement suspension component and does not affect emissions or require any legal compliance considerations. It is intended for use on vehicles in compliance with local regulations when installed as part of routine maintenance or repair.