Where can I find a diagram of the brake lines for a GMC Jimmy? I nwws to replace the left rear brake line and I need to know the routing of the brake lines and where the line is at the ABS module

One of these links should take you to a page containing a schematic showing the routing of the vacuum hoses. Need pictured vacuum diagram for 1983 oldsmobile 307, 5.0 - Fixya

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The brake system on your vehicle consists of hydraulic lines that run from the master cylinder to each wheel. The lines are typically made of steel and are routed along the frame rails and body of the vehicle. There are also flexible hoses that connect the brake lines to the brake calipers or wheel cylinders at each wheel. If you need to replace a brake line on your vehicle, it is important to use the correct size and type of line to ensure proper operation of the brake system. The diameter of the brake line is typically 3/16 inch, but it is always best to confirm this by measuring the existing line or consulting the vehicle's service manual. When replacing brake lines, it is important to use a tubing bender to create the necessary bends in the lines. Sharp bends or kinks can cause the brake line to fail, which can lead to a loss of brake fluid and a loss of braking power. If you are not confident in your ability to replace a brake line on your own, I would recommend consulting a qualified mechanic for assistance. They can help you identify the correct brake line to use, and can install it for you to ensure proper operation of your vehicle's brake system.

That is a fuel vapor box for emissions.

This one?

is it only the rear brakes you cannot bleed or all of them ??

check right rear wheel cylinder.the wheel cylinder bleeder screw could be loose or brake line to rear brake hose or brake line broken.the rear wheel cylinder seal is leaking brake fluid.

bleed at the brake line connection located on the caliper...

When you bleed the system there is a porportioning valve that has to be re-set or replaced.

THat goes to your map sensor. If you look very closely under your hood there will be a vac line diagram there

I have never heard of a reason to replace brake hard lines. Thier are short flexable ones that can replaced but no reason to unless someone put the wrong fluid in and swelled the rubber parts. In that case you would also need wheel cylinders and a master cylinder