Do you have all the shoes adjusted up? If not, you should do that before proceeding. If you had a gap of say around .10 " between each shoe and the drum, you would use up all the travel in the master.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!