it really depends on the usage of the breaks if you are driving in the city area where you are using the breaks a lot then it must be changed after 18 months but it will be best to check with a mechanic..
changing the breaks is one of the most important part of the car that needs to be taken care of.
i have a 2005 MercedesR500 and it is showing malfunction in red with a battery displayed which is saying take to workshop.
the car has been parked for a long time but., it starts fine and so is the battery. pls. advice