ok so i just picked up a CQ at an estate auction , and i got it running ( has been sitting since 05') and the engine came back and sounds great . I have one issue thats keeping me from driving it and its the lack of brakes / PS . I know they are linked . my question how does it work ? what can i check ? right now the pump reservoir " boils over " (not heat) and i have very spotty power steering and almost no pedal movement on the brake .. one caliper was seized the drivers rear .

my plan is to put a new caliper / rotor on the rear and rotors and pad all over . re bleed and use new fluid .. what else can i check
also the "BRAKE" light is on
thanks again!! help me get this think back on the road