as far as the brake lines go ... you can unbolt the bracket on the front lines and straighten out the metal tube and gain about 3 inches dont bolt it back... as for the rear line go under the jeep on the driver side you will see another steel line that is formed and goes through a routing thing kinda behind the fuel filter remove the hard line from that bracket and that will give you about 6 inches of travel... I have a 6.5 inch lift and the rear is still set up this way... but because I have longarms I had to go with longer front lines but when I was at 4 inches that setup worked fine when you get shocks though just make sure you get 4 inch shocks so that you wont pull the brake line the shock will prevent it from breaking but like I said I never have had an issue with the rear line