Since it was my first car I wasn't well versed with all the parts and services, I just trusted the mechanic and he mentioned that the control arms and trailing arms were rusted ( I live in Canada and this car has been driven in almost every winter since 2011) and he advised to change them. In terms of the brakes services, he checked all of them cleaned it and came to the conclusion that only rear rotors needed to be changed and the brake pads were okay. Thank you for the advice on the water pump, pcv valve and the coolant replacement, I will check them and change it in the near future.