Russell 695770 Braided Stainless Steel Brake Lines.
Replace your spongy, factory rubber brake lines with one of these.
For 2001, 2002, 2003, 2004, 2005, 2006, 2007 GM 6.6L Duramax LB7 LLY LBZ with 4-6" Lift

Replace your spongy, factory rubber brake lines with one of these Russell Street Legal brake line kits. The pre-assembled, steel-braided brake lines provide firmer, more responsive braking by reducing excessive brake pedal travel, which is caused by the expansion of the rubber lines. They also meet strict DOT requirements for street-driven vehicles. These kits come in pre-packaged lengths and include all of the hardware and fittings necessary for installation.

Sold as a Kit, 2001-2007.5 with 4" or 6" Lift