Topic: Brake Line Breakage

[RynothealbinO]

Yesterday I had a rear brake line blow on me on the way back form work in my '84 'Runner.  I had slammed on the brakes to check road conditions and the tires locked up like I expected, but then my pedal fell to the floor and I lost all brakes after a few uses.  It is broken about 6" ahead  of the proportioning valve, but I can't tell if it is the top or the bottom line.  What are the two lines?  Are both under pressure, or is one a return line or something?  Is it possible to cut and flare the line so I can put another piece in, or do I have to replace the whole line, which I am assuming runs all the way to the master cylinder?  I really have not been able to look too closely at this yet because of time and weather constraints, so any help would be appreceated.  Also, what size is the line?

[emsvitil]

Both are under pressure, 1 for the rear system the other is hooked into the front system so the load-sensing valve knows how much pressure there is in the front system.........

If the front one broke, you wouldn't have front brakes.

[RynothealbinO [OP]]

Does anybody know what the best way to go about replacing these lines is.  Replace the whole thing or can cut and flare it and put a new piece in?  Also, what size is the line?

[Willy Mammoth]

Does anybody know what the best way to go about replacing these lines is.  Replace the whole thing or can cut and flare it and put a new piece in?  Also, what size is the line?

Replace the whole line. You may need to get a couple lines and join them together with a connecter fitting.

Check the condition of the other lines while you are at it. If there is any rust pitting you should replace them.

I would pick up a double flare tool, bender and a tubing cutter so you can make a nice fit.

The line size is 3/16 for both the metric and SAE lines, but the fittings need to be metric for your truck.

[RynothealbinO [OP]]

Thanks for your help.  Now if I can figure out which line it is and find the time to replace it I will be set...