When should you change your front or rear brake pads for 2005 Toyota Avalon XLS and what is the best brand and price are there?

Well, you change them when it needs it.. most decent brakes have a mechinisim on them that will start to gradually squeel when the brakes get low, however some dont have that. So I would suggest that you get someone to take the front tire off and visually check the width of the brake pads.. if they are low then i would advise to change them.. also, it doesnt really matter the brand, but i would recommend a ceramic brake.. low brake dust etc...