You find where the leak is and replace that part of the line with the same size line and then you need to bleed the brakes and get the air out of the line. Be sure when you bleed the lines the master cylinder always has fluid in it You will need someone to pump up the brake and hold it and do not take there foot off of the brake when you have the bleeder at each wheel open or you will suck air back into the system.
SOURCE: bleeding brakes 2000 suburban wsith ab
Why were the brake lines replaced?
Sounds like the mastercylinder may have run dry. You have to bench bleed the master and then DO NOT allow fluid to run low, while bleeding brakes...
if master cylinder runs low on fluid and air gets in, almost impossible to bleed with out releasing the lines and bleed master it self.
SOURCE: chevy avalance brake line diagram
Left front weel wobling mechanics says it needs new roters $600
SOURCE: can't get brake fluid from abs into lines after
I read this same problem all the time, the reason u can't bleed the lines is that a special tool is required that pluge into the ABS and holds the hydraulic valves in the ABS control open for bleeding, there is no way around this.
SOURCE: need diagram of brake lines. I am replacing brake
Here is a link that should help you replace your brake lines on your Silverado.
Thank you for using fixya and be safe.
http://www.compnine.com/index.php?u=1&year=1999&artnbr=TC04-616&artsfx=NULL&supplgroup=99&catcode=56C&modelcode=C&makecode=LC&modelseries=100&uid=1&modelid=7059&capuid=1&majorgroup=04&grouptype=B
http://www.compnine.com/index.php?u=1&year=1999&artnbr=TC04-620&artsfx=NULL&supplgroup=99&catcode=56C&modelcode=C&makecode=LC&modelseries=257&uid=1&modelid=7059&capuid=1&majorgroup=04&grouptype=B
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