Hello guys,

can anyone tell me what fitting/thread the break lines on a 66 f85 330cui have?
The one from the master cylinder to the T-piece (or whatever it is called).

Thank you very much, greetings from Austria

BR Daniel

 

The tee is called a distribution block. The threads are usually 3/8"-24 on the fittings for 3/16" diameter tube and 7/16"-24 on fittings for 1/4" tube. Note that on later cars with dual-circuit brakes, GM often used different threads on the flare nuts to prevent mis-connections on the assembly line. Your 1966 only has a single circuit brake system, so this should not be an issue for you.

 

Thank you very much for your quick response. Last but not least: is it a bubble or a inverted flare? I can´t uninstall the line yet to look -> long shipping time and I can´t drive meanwhile!

BR Daniel

 

Inverted flare on the old cars.

 

US-made cars didn't start using metric bubble flares until the 1990s, and many still use the traditional inverted flare. Anything from the 1960s uses inverted flare exclusively.

 

Awsome! Thank you very much....I´m the Olds expert where I live, because.....i´m the only one with an Olds :-)