My W121, 1961 190Db, had M10x1.0
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Sent: Wednesday, April 17, 2013 4:26 PM
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Subject: [diesel_mercedes] Re: Brake line / hose connector screwed up
PB Blaster yesterday. Heat from a torch lighter this morning. Vice grips slipped off a dozen times before it finally broke loose. All I had to do was to loosen it so I could straighten out the extra loop in the hose, then tighten it back up, which I was able to do. In a few years I will probably curse my former self if I ever need to take this thing apart again. Thanks everyone for your help.
In the mean time, I learned a bit about brake lines and connectors. These old diesels use the "bubble flare" aka "DIN flare" aka "ISO flare" aka "DIN/ISO flare" whatever...apparently they are 4.75 mm lines and 3/16" is close enough to substitute without issues. If that is wrong, someone please post a correction.
Excellent FAQ here:
http://store.fedhillusa.com/technicalhelphowtopdfs.aspx
Apparently, flaring tools are available at a number of places, including many McParts stores and ebay.
To repair a section of brake line, it looks like you cut out the bad spot, get a suitable piece of 3/16" hose (or 4.75mm if you really want to be perfect), make a replacement section with a flaring tool and then use unions to piece everything back together.
I'm glad I didn't have to do this LOL but probably one day I will if I keep on driving these old diesels.
Jim
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