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240 master cylinder nut size??? 200

posted by  bluePV544 on  Sat Jan 27 08:02 CST 2007
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last visit: Sun Dec 15 19:44 CST 2013
[RELATED]

I am replacing a master cylinder on my 1991 240. I bought a set of flare wrenches for the brake lines. The 10mm is too small and the 12mm is too big. Does anyone recall if it is a 11mm? It sounds so simple however I have two sets of metric wrenches (flare & standard) and neither one came with a 11mm. Why not? My socket set has one. Thanks!
--
Bob Graham NC '65 544, '88 240 wagon, '91 240 sedan








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    240 master cylinder nut size??? 200

    uid 18083's pic
    posted by  lucid on  Sat Jan 27 09:16 CST 2007
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    last visit: Fri Oct 24 12:31 CST 2014
    [RELATED]

    All the brake line fittings are 11mm, but I used a 7/16" for years. The MC fittings should be easier to loosen anyway, being up where it's cleaner.

    IMO, a 7/16" open end should work fine—unless they were over-tightened (flare fittings don't need a huge amount of torque to seal tightly).
    --
    Bruce Young
    '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.







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