Hy 1950 FC253, I believe the brake lines are 1/4" with inverted flare nuts/fittings, there may be "banjo" fittings at the wheel cylinders and possibly the master cylinder as well, these use running thread "banjo" bolts to hold the inverted flare blocks in place, those use a copper washer on either side of the block to seal them, hope that helps.
I'm going to guess that those are the same size as on a 3100. Thread diameter would be 7/16". The hose on my 3100 has a female thread with inverted flare seat.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
Measure the OD of your existing tubing, it will either be 3/16" or 1/4"...like 3B I'm betting it's 1/4".
The 1/4 inch inverted flare nut has a 7/16-24 thread. So your brake hose will need a 1/4" inverted flare Female end at the frame to mate up with the 1/4" inverted flare nut.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD
Just a note that I have moved this conversation to the Driveline forum as it is the best place to continue the conversation.
Best Regards,
Dan
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
Hy 1950 FC253, the brake hoses on your truck are all the same, they are Raybestos p/n BH4497. They have 7/16" X 20 male thread on one end and a 7/16" X 24 female inverted flare one the other end, they use a copper gasket to seal the male end of the hose, hope that helps.
