Just finished changing a variety of filters on my Ram truck and the wife called me from Wendy’s saying her brakes weren’t ‘right’. We have a downhill section of road on the main drag before you turn off to our street, then our driveway is very steep uphill. . . . with a sharp turn at the top. Told her to limp to the Napa by the Navy Base and park it. I went and picked her up.
One of the owners was just leaving when pulled in and was coming out to get a phone # when I pulled up. I’ve known him for going on 20 years, they’ve never met. So as we’re looking where she had backed up, there was A LOT of brake fluid across the parking lot. So now, I get to get up early to find out what lines blew. Truck’s 16 years old and haven’t had many issues over the years. This was the scariest by far.

 

Metal lines rusted out most likely. The good news is it's not expensive for the parts, bad news is that it's a PIA replacing them.

 

Wow, good to hear you took the right precautions. If the brake system lost a rear brake line a proportioning valve should close and keep front brakes functional inversely for a front loss. im sure there are threads here about corroded brake lines. keep us posted on what you find.

 

Update
NOT GOOD! LF hard pipe to flex leaks, spray at ABS, leak in hard pipe on cross member aft and above rear diff that feeds the flex hoses for rear brakes.

anyone have a brake line drawing “road map” for the H2? My maintenance manual does not have detailed or complete pics of the hydraulic lines and routing

This looks like a body lift evolution! Hell, right now I can’t even get it into my garage, it barely fits at that!
MikeH

 

Just follow the line, make sure you can see where it connects to the fitting. Cut the line from the fitting, remove the fitting with a socket wrench, remove the line from the fitting, clean the fitting. Get yourself a flaring tool and copper tubing. Feed the tubing through tight areas(make sure to protect the opening on the tubing so no debris gets inside, while you are routing the tubing). Route the tubing as oem, install your fittings on the tubing, then make a proper flare to seal.
Do it with copper and you will never have to worry about it rusting out. Properly bleed the system, then check for leaks.
This set includes new fittings, check to make sure they work on your application, or reuse the original fittings:

 

i was luckily in my driveway when i blew one last year on my tahoe. went to put it in reverse and blew it after a trip to town. crazy stuff...

i ended up with a new master cylinder, 4 new calipers and all new lines all the way around on my tahoe because they were all rotted. would fix one then blow another one while getting the air out.

good luck,
steve