GM B body rear axle brake line diameter?

[JustJohn]

Working on a rear disc conversion and decided to fabricate new brake lines for the rear - I just don't like the extra bends in there.

Does anyone know the stock steel line size?

[Apogee]

Factory rear axle lines are 3/16"...depending on the year "B-body", the stock fittings would have been either 3/8-24 inverted flare or M10x1 bubble flare.

Tobin
KORE3

[JustJohn]

Thanks! Should have pointed out it's the 69 model year.