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Hello, fellow Comanche owners! My name is Zak and my online name is Cupid. I've been a member here at CC since 2012 but I've never posted. I've recently begun working on my rear drum brakes on my 1991 Comanche and I have a few questions about the layout of the brake lines and what they do. It's easier asked with pictures. So I'll let the pictures do most of the talking. So below we see my rear axle and on the rear axle is some sort of junction for the brake lines. Please correct me with what it's called. The left and right brake lines have been removed since they need to be replaced. the bottom hose is the incoming brake fluid I'm assuming. It's a normal brake hose. Nice and stiff. What I would like to know is what is that hose coming out from the top? It seems to be going directly into the frame of my truck and I have no idea why. I have a picture of that, too. Here is a picture of the soft very pliable hose going from the top if that ?junction? directly into my frame. Please help me here. What does that hose do? I'll have a few other questions, too I'm sure. Thanks in advance everyone! I've owned my Comanche since 2007.