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Thanks Art, great pics.
I took apart a 2nd used spare unit today - gently to examine more closely. I found that the band was worn through on the switch side. Shiny metal was visible when I looked in through the cleaned switch opening.
There were small shreds of the nylon band that came out with the sleeve. So
1. Perhaps the band can be worn through by the switch but I'd bet that it's more-often ruined by someone re-centering a stuck sleeve.
2. Some folks skip requisite brake-fluid replacement: don't know to do it or on a small repair the mechanic says "we can flush the system but we risk breaking bleeder screws ... plan on 4 calipers, some lines, a lot of labor".
So you end ep with a corroded/sludged sleeve that's hard to re-center.
Two questions:
1. Your diagram says "alternate part ... 91-up". They mean that ABS cars don't have this mechanism, correct? (Some 1991 are non-ABS).
2. What's the effect if you remove the valves and sleeve ie. does the block have any braking (vs warning) function?
2a. I thought until recently that this junction/octopus block had a proportioning function but in reading here I learned that proportioning is done via the reduction valves on the rear axle.
(It's called a "proportioning valve" on eEuro parts).
2b. I'm not suggesting that we could gut the block. And I think that the sliding sleeve would have to remain: it is also a seal - without it pressure would blow our the nylon switch.
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240 drivers / parts cars - JH, Ohio
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