These might be of help. Extracted copies form the '38 Shop manual posted here: Chevy Old Car Manual Project - '38 Shop Manual

All credit to that site for supporting our community!

Let us know how it works out. wave
Attachments
Chevrolet's 1938 Shop Manual Brake adjustment guide.png (983.37 KB, 131 downloads)
Brake Adjustment guide
Chevrolet's 1938 Shop Manual Brake service chart.png (1.22 MB, 130 downloads)
Brake service chart diagram

~ 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)