brake oil decrease cuz ur brake discs r no more new,its wid pessage of tym jaisay jaisay aap ki discs khatam hoti hian oil kam hota hay ,jaisay e aap new discs dalo hay it will b full again,aur agar aap nay isay fill kiya hay wo bhar b ajay ga
n leackage of water may have many issues
ur radiator cap may worn out
there is sum leckage in ur radiator
u gas kit may blown
a gud mechanic may guide u well