Hehe I was also discussing passo dear, when u write "say a civic" in angraizi it means just as an example. I have a 1.8 manual nissan (twice the torque then a passo, same weight, bigger dimensions) running on 185's which brakes flawlessly (again as an example, to make understanding the issue easier), so the concept of this dinky facing "braking problems" on the size at which the engineers who made it thought 155's would do great is kinda hilarious to say the least.
I wrote down the disadvantages just a page back, lemme copy them again for your ease 
Disadvantages of wider tires, specially in this one.
Reduced fuel average (In a car meant to give exceptional economy)
Reduced acceleration (In a car this is extremely sluggish already)
Screwed steering geometry (Not that its too sharp as stock)
Greater stress on suspension (Not gonna get the same feeling after its redone even with claimed original parts)
Advantages:
Better road clearance (Since we have car braking humps all around out roads)
Yo look (Look how cool my econo box looks)
Psychological benefits in handling (Any track lap times to gauge them for a passenger vehicle)
In short...... why u do this :-/
U might wanna read this also, just in case you are looking to understand the issue. Otherwise if you are hell bent on sticking to over sized tires in small rides, you are not alone. Enjoy
Tire Rights in Pakistan; a guide for buying the appropriate rubber - PakWheels Blog
About checking the braking effectiveness (interesting term), i have been checking them on same rides after swapping sets of rubber pretty often. Have you ?
