Volvo RWD 200 Forum

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240 master cylinder nut size??? 200

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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Sears Craftsman has an 11mm flare wrench 200








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240 master cylinder nut size??? 200

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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240 master cylinder nut size??? 200

And, a 7/16" flare wrench would be even better.







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