Rear left hand side breaks makes a chchchchc sound?

Question

i have changed the break pads and discs also i noticed that the break disc was all rustie before i changed it what is wrong withmy car

Answer 1

Did you check to see if the caliper was working?

A rusty brake disc(rotor) indicates that that caliper to that wheel is not working at all in stopping the car.    Stopping power is reduced because now only 3 or 2 do the work that 4 should be doing.    

    Take it in to a brake shop and have them fix it proper.

Answer 2

well there could be rust still left in the housing and you hear it rubbing or you have air in your brake lines...good luck!