The body lift will have nothing to do with the brake lines. But, you have to watch other things like ground straps, fan shroud, etc. but only going up 1 inch shouldn't create any problems.
As far as the shackles, the stock shackles are 4 inches from bolt to bolt. If the lift shackles are a true 1 1/4" lift, they will be 6 1/2" long from bolt to bolt. An extended shackle gives you 1/2" of lift for every 1" of shackle above 4".
Even so, a 1 1/4" shackle lift is still no reason to extend the brake lines. No worries with them till you get above 2.5" on the suspension.