This ATE brake master cylinder adapter is a direct-fit replacement for Porsche applications listed in the fitment table below.

ATE, a division of Continental AG, has been engineering hydraulic brake systems in Germany for over a century. An OEM supplier to manufacturers like Porsche AG, Mercedes-Benz, and Volvo, ATE produces factory-level rotors, pads, and hydraulic components built to strict European standards. Known for consistent pedal feel, proper fitment, and long service life, ATE remains a trusted choice for reliable, OE-quality braking performance.

Technical Details

Manufacturer part number: 390393
Type: Master cylinder brake line adapter (banjo fitting)
Thread: M10 x 1.0 (commonly listed for this adapter)
OE cross reference: 914.355.531.00 (commonly listed)

Fitment & Compatibility

Use the fitment table below to confirm year and model details. If you’re unsure on fitment, send us your VIN and we’ll help verify it.

We’ve been doing Porsche brake work for over 20 years, and we still treat fitment questions like they matter—because they do.

Year	Make	Model
1965	Porsche	911
1966	Porsche	911
1967	Porsche	911
1968	Porsche	911
1969	Porsche	911
1970	Porsche	911
1971	Porsche	911
1972	Porsche	911
1973	Porsche	911
1974	Porsche	911
1975	Porsche	911
1976	Porsche	911
1965	Porsche	912
1966	Porsche	912
1967	Porsche	912
1968	Porsche	912
1969	Porsche	912
1976	Porsche	912
1970	Porsche	914
1971	Porsche	914
1972	Porsche	914
1973	Porsche	914
1974	Porsche	914
1975	Porsche	914
1976	Porsche	914

Adapter

ATE Brake Master Cylinder Adapter (Banjo Fitting) for Porsche 911/912/914 (1965–1976)