Just found a copy of Vintage veteran brake repair on eBay, hoping it has a good section on 34 Buick cable adjustment steps.
Took off rear hubs and found one Hyatt roller bearings #7147 was broke, took some research but found two bearing supply places with new upgraded roller bearings for rear hubs. Newer bearings have 15 rollers while original had 22 rollers, they said this newer design helps with heat issues