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Sounds like you’re on the right track, way cool it’s your Dad’s 61!
If you haven’t seen it yet, here’s a link to the original GM Communication film w/ info on how the new for ‘63 Self Adjusting Brakes work also updating older systems to the new style…
https://www.youtube.com/watch?v=T6qTqJ-tdrE&t=17s
~ Pete
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