1953 Chevrolet 3100 Series

brake lines

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Hi folks, I am trying to remove the brake lines from this truck, so that I can replace them. I got to the cross member that goes under the cab... there is a brake line there with a 7/16 fitting on it... and it is held on by these two large fasteners, which I think are large clutch heads? I dunno, been awhile since I messed with those.

Do they screw out or not?

Do any of you know what size it is? I need to get a proper tool to take it off so I can get the brake line off.

This is the fastener I am referring to :

image of fastener in question

the folder of brake line photos :

album of 1953 Chevrolet 3100 Series - brake line photos

Thanks folks.

-Woog