Hi, My car Mazda protege2000, 1.6L. 122900KM, When I turn and inverse,I canheard some knocking noise. So I went to the garage ,they checked it and give the report:

KNOCKING NOISE WHEN TURNING LEFT OR RIGHT FROM REAR END OF CAR.
ROAD TEST :
LE BRUIT VIENT DU TOP PLATE ET LES 2 CHOC
LES LINK ARR EST LOOSE
LINK AVD EST LOOSE
CHOC AVANT DROITE A UNE FUITE D HUILE

At same time I ask them check my brake, report is:
CHECK FRONT AND REAR BRAKES
FREIN AVANT 25%ROTORS TRES ROUILLER
BESOIN DE PADS ET ROTORS
FREIN ARR 40% BESOIN DE SERVICE

Is my car have big problem? Can i change it by myself? Thanks a lot!