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The Bosch Brake Master Cylinder (Part Number 0986481140) is an essential hydraulic component designed for vehicle owners and mechanics seeking OE-quality braking performance and precise vehicle fitment. Engineered to strict manufacturing standards, this cylinder provides reliable pressure distribution for consistent stopping power in compatible Audi, SEAT, Skoda, and VW vehicles; however, because of subtle variations in automotive braking systems, it is critical to verify compatibility with your specific vehicle's make, model, and year before installation.
| Model Part Number | 0986481140 |
|---|---|
| Brand | Bosch |
This product is typically supplied as the hydraulic assembly; check your package contents to determine if the reservoir is pre-attached or if you need to reuse your existing one.
The piston diameter is a critical specification that dictates the volume of fluid displaced; it must match your vehicle's original engineering for the brakes to function safely.
While technically possible, installing a master cylinder involves opening the brake hydraulic system, which requires specialized knowledge of brake bleeding and safety procedures. Professional installation is highly recommended.
Compare the part number 0986481140 and the technical specifications (piston diameter, thread size) against your current part or your vehicle's service manual.
Always use the brake fluid type specified in your vehicle's owner manual (e.g., DOT 4). Never mix different types of brake fluid.
Air may be trapped in the hydraulic lines; perform a complete brake system bleed according to the service manual.
This often indicates internal fluid bypass; check the master cylinder seals or look for external leaks at the connection ports.
Check that the M 12 x 1 thread connections are tightened to the correct torque specifications and inspect seals for wear.
Installation of the master cylinder should be performed by an experienced automotive technician. Given that this is a critical safety component, the system must be properly bled of all air after installation to ensure effective operation. Ensure that you use the correct brake fluid specified in your vehicle's owner manual. Regularly inspect the surrounding area for signs of fluid leaks, and check that the reservoir cap is sealed correctly to prevent debris or moisture contamination. Before purchasing, verify your existing master cylinder's dimensions and port configuration against this part to ensure a perfect match.
