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From digest.v7.n455 Thu Oct 16 18:59:23 1997
From: "John H. Stein" <jhstein_at_mindspring.com>
Date: Thu, 16 Oct 1997 18:18:45 -0400
Subject: Bleeding brakes w/pressure systems
For those who care, as noted here (and in the 7 series digest) BMW service
manuals make a strong diference between bleeding ABS and non-ABS systems.
BMW permits presurized/blo-through systems on non-ABS systems, and
recommends a vacuum/suck through system for ABS types. Why??? I don't
know, perhaps some better informed techie (only admiration intended) can
more fully expound on the WHY aspect. Any comments Chris???
Additionally, for those of us w/ high mileage vehicles, be Extremely
careful w/ the old "pump it" method, as that will force the master cylinder
past its normal travel limits and will probably cut the edges on the gunk
(a VER?Y scientific term... grin) which grows on the cylinder wall.
Lastly, for all of you unfortunates in the cold climes..... if you have
ever wondered why auto manufactures in the cold countries (who give a damn
about their products) recommend an annual brake system flush.... it is
because as the brake fluid drops below freezing, the water vapor which has
been absorbed into the brake fluid (as it is hydroscopic, meaning it
absorbes water) freezes, it forms razor sharp crystals which cut the poor
master cyl seals causing brake failures.... Have you ever wondered about
the correlation between brake/hyd clutch failures and the first hard
freeze... what a thing to ponder as winter approaches....(sigh another
weekend task)
I have a very good home bilt, vacuum based system, and will be happy to
forward the details to anyone who asks. (I have posted the info here
before and dont want to waste any more bandwidth)
regards
John H. Stein
jhstein_at_mindspring.com
fax 770 514 8285
85 745 190,000mi
85 735 125,000mi
83 533 226,000mi
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