Here's a clip from the 1929-1954 Parts Catalog showing routing and lengths for brake lines for 1941. I consolidated the diagram with the length chart for 1941 vehicles. If you notice that none of the models shown routed a brake line up the left side of the frame (line designated BL. That means that your 41 should be very similar to my '51 routing. I wouldn't be surprised if it uses the same division block that attaches thru the frame in a hole with 2 flat sides to keep it from rotating. The division block looks like the second picture (the two different PN's are probably for different size connections, but the one at the front is for 1/4" lines, IIRC)
Attachments
41 brake line diagram..jpg (76.25 KB, 21 downloads)
1941 BRAKE LINE DIAGRAM
Brake line division block.jpg (9.81 KB, 21 downloads)
BRAKE LINE DIVISION BLOCK

Kevin
1951 Chevy 3100 work truck
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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.