MoreCowbell

I just had the front-to-rear brake line on my 2001 F150 rust out. I figured I would post information on this fix that should be useful to anyone else who needs to make such a repair.

The front and rear fittings do NOT match. The rear which connects to the rear/center hose is 3/16" inverted/double flare. The front (under the driver's feet) is M12-1.0 bubble flare (see picture).

Overall length of the line is (conveniently) 84". I rebuilt mine using a 72" line and a 12" line which are commonly available, along with a union and an inverted to bubble adapter. Another option if you have the tool is to buy bulk line and do the flares yourself like some here recommend.

If using 72" and 12" replacement lines like I did, put the union between the two on the front end so that it is not in a bend or one of the plastic retainer clips.

chopper93

wish i would haveknown this 2 days ago. i just signed up. same thing happened to my truck. alot of rust underneath. i came up with the same solution. what i didnt know, but planned to find out was, do they make such a union, a double and bubble flare union.I guess they do. Was the union hard to find?

chopper93

thanks a bunch. Saved me some brain time

02SuperCrew54

Old thread, for an old truck, and very old brake lines. Thanks for sharing your process. It worked well for me!