I am about to embark upon replacing all the rusted out brake lines on my 2001 suburban 2500. I am unsure what size the lines are to buy replacement tubing. I plan on buying and bending the lines myself. Anyone done this already and have any advise and know what size tubing in used on this vehicle?
thanks

 

Here is a link to a similar question...
https://chevroletforum.com/forum/sil...nt-tips-57883/

 

I didn't read though the referenced Thread but, here's a couple tips...

DON'T use Copper Tubing. It isn't rated at the pressures which are developed in the Braking System. Steel Tubing is what should be used.

Most all of the connections are Reversed Flared. That's not the easiest thing to do if you're not relatively experienced and have the proper Tools to do that with.

There are any number of Auto Parts Stores, which have various lengths of Steel Brake Line already made up. You could measure and purchase the pieces, and just connect them in, as you remove the old stuff. There probably will be more than one diameter Tubing on your ride, so, just take a piece with you, and get the right size that way. Take a close look at your Flexible Lines, best done now, than have one fail later.

You'll probably generate a fair amount of "trash" when doing the change, and no telling what's in the new lines. Blow them out with air before you put them on, and it's a good idea to go ahead and put new Cups in your Slaves at the same time, plus Pads/Shoes if you want to take that much on.

You have an ABS System, and that takes a specific Bleeding procedure when all's done.

Good Luck !

 

I don't know about the pressure concern on using copper tubing but a good reason not to use copper tubing in a brake line or fuel line is that it'll work harden with vibration and will eventually fatigue and crack and you'll lose your fluid.

 

Just generally speaking...

1/4" Copper usually has a burst pressure of just over 150 psi,
1/4" Steel runs over 2000 psi, not hard to get close to on hard breaking.