Looking for suspension/brake info for a 71?

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I found the info about the 12mm, and 14mm differences in the calipers, but looking for more info on the rear. If staying with the factory 5 x 112 pattern, what backing plates from what years would be a direct replacement for a 71? I can't quite find what I'm looking for on front beams. If looking for a used replacement, what years would work? I'm assuming it's at least after 71 to accommodate the booster. Thanks for any info/links anyone can provide!

[pioneer1]

Your question is kind of vague to me. The front beam changed late 73 I believe. There are front beams in the classifieds.
If you buy a late bay beam and you want to keep your existing calipers you need to transplant the spindles from the 71 as well. Maybe the beam you buy will be complete with good calipers,etc. The question about the rear plates? Did you want to know which years will fit?
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[kreemoweet]

The new rear brake backing plates available fit all busses 71-79, although there were some minor differences in the originals.
Likewise, any 71-79 beam fill fit a 71 body.
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I think both of you have answered my questions. It just seems like 70-73 had significant brake changes, and wasn't sure how that effected everything else. I just acquired a 71 with a badly rusted beam, and rear backing plates, and wondered what I should look for to replace them while keeping everything stock brakewise.

So for the beam, the beam itself/torsion springs/torsion arms from all 71-79 years with the power brakes/booster mount are identical? 71-72 spindles/brakes are one style, and 73-79 are the other?

And the backing plates, the new ones available will work for a 71 with stock 71 brake components? I see 64-70, 71, 72-early 73, and late 73-79 had different rear shoes. Also the rear cylinders were up to 71 with internal shoe slots, and 72-79 had external shoe slots. After a closer look, I see the 68-70 rear plates had "horizontal" adjusters, where 71-79 had the adjusters that angled up. Thanks!

[TDCTDI]

Put the rear backing plates, shoes, & hardware from a vanagon on there & have self-adjusting brakes on there.
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[kreemoweet]