ATE Brake Fluid Reservoir Cap for BMW 5 Series/6 Series/M6 (1979–1988)

This ATE Brake Fluid Reservoir Cap is an application-specific replacement for select BMW 5 Series, 6 Series, and M6 vehicles from 1979–1988. It closes and protects the brake-fluid reservoir while allowing correct system service and should be matched to the exact model, year, and brake configuration before installation.

ATE-branded brake fluid reservoir caps are engineered as direct-fit brake-system components for their listed applications, supporting correct braking operation, fitment, and serviceability at the installed location.

Technical Details

• Manufacturer: ATE
• Manufacturer part number: 390428
• OE/reference number: 34-32-1-120-841
• Part type: Brake Fluid Reservoir Cap
• Listed vehicle range: BMW 5 Series, 6 Series, and M6
• Listed model years: 1979–1988

Fitment & Compatibility

Use the fitment table below to confirm the exact year, make, model, and submodel before ordering. Brake-system equipment can vary within the same model year, so compare the installed component and reference number when possible.

PMB Performance can help verify the application when the vehicle has multiple brake packages. Provide the VIN or existing part number for support from a team with more than 20 years of brake-component experience.