Hi Kevin,
     I've just looked through Hudson manuals.  Several of them supply a part number and a description.  One of them,  Hudson Master Group Parts Book 1940-1941-1942, has a picture and a diagram, with springs referenced to part number and description.  Another, Hudson Group Parts Book 1946 has the same picture but not the diagram.  The picture shows the spring that keeps the clutch pedal up.  It goes from the clutch pedal at the pedal adjusting yoke to the cross shaft lever.  There are three holes in each of the arms where the adjusting yoke goes. 

Visible in this picture but not labeled is the clutch overcenter (or assisting) spring.  This goes from an attachment part way up the clutch pedal lever to a bracket on the frame behind it.  It is a strong spring.  Another manual shows a special tool to assist in putting this spring on if one has removed it.

     The diagram shows the four wheels and all the brake linkages between them.  One spring goes from the free end of the hand brake cable lever to a bracket on the frame behind it.  This keeps the brake pedal up, so that there is free play at the top of the movement of the brake pedal.  There is another spring which goes from a brake link, which is attached to near the center of the hand brake cable lever, to a bracket on the frame.  I don't know the purpose of this spring.

     When I had my 1946 Super Six a long time ago, I never had to adjust anything except the height of the clutch pedal, so I don't feel like I know much about the system.

Per
 

Per, Thanks for your in depth reply. I found the illustrations in my 1946 shop manual and parts book, the 42 parts book helped as well. After 75 years, the brake/clutch springs under my truck were all in the wrong places. Kevin