Changed the pressure line for power steering.pump now my brakes won't work...

Read down the page until you find the part about bleeding the system. http://www.clublexus.com/forums/ls-1st-and-2nd-gen-1990-2000/343856-all-in-one-power-steering-fix-s-solenoid-acv-plug-drain-flush-bleed-system-diy.html