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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".
This is so true. I use the excuse myself. Deciding to bleed the system on one which is long overdue involves this one very real risk, breaking bleeder screws. So, before any commitment is made, we should visit all 8 valves with a rap and a tap to be sure they can all be unfrozen.
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).
Correct. ABS cars do not have the differential pressure sensor, but use a more sensible float sensor in the reservoir.
But the NON-ABS 1991 is special. Its reservoir also uses the float sensor, but the manifold to distribute the brake lines is just strictly a manifold -- no communicating parts -- no moving parts. An excellent replacement for the old octopus, if combined with the special reservoir and float sensor. Make a promise not to scrap any non-ABS cars without snagging these items. You'll not be sorry.
2. What's the effect if you remove the valves and sleeve ie. does the block have any braking (vs warning) function?
If you pulled the shuttle out of the octopus, even if you could block the switch port against hydraulic pressure, you would no longer have two independent brake circuits, losing the redundancy advantage.
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).
Correct again. They reduce the braking of the rear calipers proportionately.
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.
Exactly right. That's what makes the non-ABS 91 block a good thing to have.
--
Art Benstein near Baltimore
People who live on that "New Car Smell" and have their Credit Score memorized better than their own birthday will ALWAYS say you're Crazy. -punk240 Tim
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