abbylind Posted September 9, 2016 Report Share Posted September 9, 2016 IIRC 720 rear brakes are self adjusting drums. Would it be practical to put 720 rear brakes on a 620? No more adjusting rear brakes?.... Thoughts? 1 Quote Link to comment
datzenmike Posted September 9, 2016 Report Share Posted September 9, 2016 The self adjusting mechanism was introduced Dec '81 model year 720s. About half way through the '81 model year. I suspect you would need everything, (maybe not the drum) including the backing plate. 1 Quote Link to comment
abbylind Posted September 10, 2016 Author Report Share Posted September 10, 2016 Something to think about...Thanks! 1 Quote Link to comment
wayno Posted September 10, 2016 Report Share Posted September 10, 2016 When walking around the wrecking yards I always assumed that the brake drums that were dished were not self adjusting, but the drums that were not dished were self adjusting. As for why they made them without the dish, it gave the vehicle a wider stance along with the axle being wider also, seems like I only have seen self adjusting brakes on 1985/86 except for one 1984 truck, but I am not in the habit of removing brake drums to look at the brake shoes in the wrecking yards so I don't recall seeing dished drums with self adjusting brakes, I only turn the drums to see which way the opposite drum turns. 1 Quote Link to comment
abbylind Posted September 10, 2016 Author Report Share Posted September 10, 2016 How can you tell dished from non dished? 1 Quote Link to comment
Charlie69 Posted September 10, 2016 Report Share Posted September 10, 2016 Just go disk on the rear and be done with it. Quote Link to comment
wayno Posted September 10, 2016 Report Share Posted September 10, 2016 How can you tell dished from non dished? See this drum has a dish where the lug nut studs are, it's sunken in the center about a quarter inch. See how this later 1986 720 drum is raised in the center about a quarter inch, this is a self adjusting rear brake type drum I have. As I said, just because the drums are different doesn't mean I know that they are self adjusting type rear brakes of not, I don't know for sure, but this 1986 rear drum covers the self adjusting type brakes in this rearend I have. 1 Quote Link to comment
abbylind Posted September 10, 2016 Author Report Share Posted September 10, 2016 Ahhhh more clues...Thanks! 1 Quote Link to comment
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