I also think it unlikely that all three your cars have bent axles, and rather suspect distorted or poorly skimmed drums.retrovan wrote: ↑Fri May 31, 2019 2:59 pmIf I had 3 cents to rub together, I would still bet it is oval drums.
To have 3 cars by the same owner, with the same brake guy, have the same problem, points to drums, not bent shafts.
This is possible but never heard of someone having that problem.
Good luck with your investigation.......
Try to trouble shoot...
Lift the rear wheels off the ground. Adjust the brake shoes until they just contact the drum. Turn each drum through a full revolution. If you find a drum that has constant resistance for the full revolution, that drum is probably running true. Now swap the true running drum to another axle, and check again as above. If resistance remains constant, the axle is not bent.
I recently had a well known brake company in Cape Town, skim my Karmann Ghia rear drums. Long story short... drums ended up 0.8mm out of true, and by the time the problem was corrected, the drums were over sized, and turned into paper weights... Not every brake shop can skim these drums properly.