Those hard lines aren't the only parts to deteriorate, rubber breaks down over time too. So while you've replaced the rusting lines, the hoses they attach to could also stand to be replaced.
Dorman Products
FLH620052- 99-07 GM Truck & Hummer H2 Right Front Brake Hose; Rubber
Sale price$27.03
In stock
Dorman Products
FLH620051- 99-07 GM Truck & Hummer H2 Left Front Brake Hose; Rubber
Sale price$27.03
In stock
Dorman Products
FLH620694- 99-04 F-250 / F-350 Super Duty 4WD, 2WD RWABS, AWABS Right Rear Brake Hose; Rubber
Sale price$25.48
In stock
Dorman Products
FLH38871- 91-05 GM S-Series 2wd / 4wd Non ZR2, Rear Brake Drop Hose; Rubber
Sale price$13.88
In stock
Dorman Products
FLH381065- 98-05 GM S-Series 2wd / 4wd non ZR2 Right & Left Rear Brake Hose; Rubber
Sale price$13.38
In stock