2001 chevy tahoe, brake line underneath rusted and leaking, how difficult is it to change out, and where can i find a print of where lines run

limited info sounds like your talking of a Brake Proportioning Valve

What kind of help?

yep follows frame and inside gas tank to rear wheel well to above axle 1999 2006 Yukon Tahoe Suburban front to rear axle brake line replacement... 2004 chevy tahoe brake line diagram Google Search the 3 diagram is the front to rear

just follow the line that's leaking good luck finding the routing for those.

brakes are a critical safety issue
the flares on the lines are double flairs ( required by law)
it would be cheaper in the long run for you to go to accredited brake and clutch professional shops and get quotes to replace the steel lines
they have the equipment , material and the knowledge to do the job properly
or you can diy by going to a wrecker/junk yard that handles your make of vehicle and get good rust lines as replacements

Not difficult to do. Chevrolet Tahoe is a small metal canister that is connected to the fuel line, it is located near the vehicle's master brake cylinder on the driver's side of the engine near the firewall. Remove carefully trying not to spill fuel around any other rubber lines, replace in reverse order as removed. Changing the fuel filter is very simple and can be done in approx. 45 minutes.
Good luck..

They stretch with age and use. If you get down underneath it you will see an adjuster where the three cables come together, being a threaded rod and nut situation, and you take the slack out of it. If the cables and hardware are all corroded and rusted, you can buy new cable sets at parts stores. If it has rear drum brakes you may want to make sure the shoes are adjusted before you take the slack out of the cable. If you overdo it expect to find that one rear wheel or the other refuses to turn when you attempt to drive.

you most likely have a brake line rusted threw, cut the line ahead of the leak and after the leak and splice in a new piece of brake line, it will have to be steel, you can not use rubber. if you take the line to a parts store they can size it up and get you a piece of steel line and some pressure fittings to put it back together, after you repair the line then you will need to bleed the rear brakes.

If you have'nt yet replaced the flex hose going to the caliper then it may need to be replaced or unfoald the clamp the hold it to the strut to release the blockage caused by rust build up,if there is no wheel speed picked up by the abs then it does'nt come into play.

should be one line going to the back and then it tee's,somewhere by the rearend,if the lines are all rusty,should replace them,make sure that its not the master cylinder.if you look underneath it,they leak from the bottom and run down the firewall or the fluid travels down one of the lines and drips somewhere else,brake lines are solid steel tubing with flare ends on them,they come in multiple lengths,they are straight sticks,you have to bend them according to the old line that you replace,the only rubber lines are the high pressure front caliper hoses,the lines are fairly resonable(local parts store)but a pain in the **** to bend and install,also if the insides of your back tires have brake fluid on them your wheel cylinders are leaking,good luck,hope this helps,aloha from maui todd0708