The Russell brake adapter connects a -3 AN brake line to a 7/16in-24 female inverted flare port, a common thread on Ford Mustang brake systems. It is machined from lightweight aluminum for a leak-free transition between AN and factory inverted flare.
- Type: AN-to-inverted-flare brake adapter
- AN size: -3 AN
- Inverted flare thread: 7/16in-24 female
- Application note: Ford Mustang
- Material: lightweight aluminum
- Part number: 640591
FAQ
What does the 640591 adapter connect?
It joins a -3 AN brake line to a 7/16in-24 female inverted flare port, a thread found on Ford Mustang brake systems.
Is a sealing washer needed?
No. The inverted flare and AN flare seats seal by contact, so no thread sealant is required.
What is it made from?
Lightweight aluminum, part number 640591.

