Audi A3 8P TT 8J VW Passat B6 B7 Golf Brake Fluid Tank Cap 1K2611349C

Audi A3 8P TT 8J VW Passat B6 B7 Golf Brake Fluid Tank Cap is an original component from the Brake pumps group, designed for use in the braking systems of popular Audi and Volkswagen models. It ensures a tight seal for the reservoir, stable operating conditions for the brake fluid, and safe vehicle operation in daily use.

Specifications and technical data

• SKU: RHD-1K2611349C
• Mark: Audi
• Condition: Used
• OEM Part Number: 1K2611349C
• Substitutable numbers: 1K2611349C, 1K2 611 349 C
• Rim width: 8
• Category: Master Cylinders

Purpose and function in the braking system

The described cap works with the brake fluid reservoir that supplies the master brake cylinder in Audi A3 8P, Audi TT 8J, and selected VW Passat B6, B7, and Golf models. Its task is to maintain proper pressure and a tight seal in the upper part of the reservoir, as well as to limit the ingress of moisture and external contaminants. As a result, the brake fluid maintains stable operating properties, which translates into predictable brake pedal feel and consistent braking force.

Construction and OEM fitment

The cap has been designed as an OEM component, with geometry matched to the factory reservoir used in the listed models. Properly shaped sealing surfaces and a precise thread or latch (depending on the reservoir version) ensure secure attachment and easy installation without the need for modifications. The material used is resistant to brake fluid and typical temperature fluctuations in the engine bay, which reduces the risk of deformation and leaks over the long term.

Benefits of using an original cap

Using an original brake fluid reservoir cap instead of a worn or damaged part helps restore the proper operating conditions of the braking system. Key advantages include:

• maintaining reservoir tightness and limiting moisture access to the brake fluid,
• stable pressure conditions in the upper part of the system,
• factory fitment for the reservoir used in Audi A3 8P, TT 8J, and selected VW Passat and Golf models,
• simple installation without additional adapters or modifications.

For users who are upgrading or servicing their braking system, using an OEM component is important for safety and compliance with the vehicle's factory specifications.

Use in upgrade projects and youngtimers

Audi A3 8P, TT 8J models, as well as the corresponding generations of VW Passat and Golf, are increasingly treated as youngtimers or as a base for upgrade projects. In such cases, replacing braking system components – including the reservoir cap – is a natural stage of maintenance work. A used, functional OEM component allows you to maintain the original character of the vehicle at reasonable maintenance costs. If you are interested in the broader context of using used parts in cars from the 1998–2012 period, it is worth reading the article on the second life of youngtimers and the role of used parts in refreshing Audi and VW vehicles.

Component condition and practical aspects

The cap comes from dismantling and is offered as a used part, which allows you to combine factory fitment with an attractive price. Before installation, a standard visual inspection and cleaning of the contact surface with the reservoir are recommended to ensure proper sealing. For vehicles used intensively or after major brake system repairs, replacing this component is a sensible addition to brake fluid service and master cylinder inspection.

Expanding technical knowledge

Although the reservoir cap is just one element of the braking system, its proper operation affects the stability of the entire system. For a fuller understanding of the relationships between individual components in the engine bay – including pumps and reservoirs – a guide on fuel systems, selecting parts by OEM numbers, and diagnostic principles may be helpful. More information can be found in the material on the construction, diagnostics, and selection of fuel system components, which organizes the approach to working with catalog numbers and service procedures.

If you are planning a comprehensive repair or upgrade of the braking area in your Audi and need other elements from the same group, such as pumps, reservoirs, or additional brake system accessories, check the available parts in the Audi Brake pumps category.