GMC SAFARI BRAKE

I Had A Tune Up 6 Months Ago And The Mechanic Said The Spark Pugs Wires Were Bad And Wanted A Fortune To Replaced Them So I Did It Myself...

I Replaced Master Cylinder And Bleed All Bleeders. Why Are The Brakes Still Having Problems? And There Are No Leaks In The Line.

Lost Both Power Brakes/ Steering @ Same Time, No Broken Belt, No Visible Signs Of Leaks, Fluids On Both Are Full

Is There A Special Tool Needed To Remove The Seal To The Bearings On The Inside Of The Rotor? Do I Need To Purchase New Seals Or Can I...