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Yes it definitely is dangerous.
yes, but only when the brakes are applied.
your car can be low on brake fluid, you car can have a brake leak and if so check next to the drivers side tire to check but it is rare thought the next thing is your actual brake system has a issue like a bad rotors bad calipers bad cables you showed have a mechanic to take a look at it. Last thing is don't drive to the mechanic you showed get it towed because it can be dangerous.
If the rotors are worn too thin, they could snap apart while braking, leaving you with no braking power at all.
It would be highly unlikely.
Yes, it is.
you cant drive your car if you have hole in your engine because your engine is a propeller for your car.
Sort of- not to the car but you will loose the Anti-lock braking system (abs) which could make the car more dangerous to drive.
Yes.
A Ferrari Monkey
its because of accident
Yes. A damage wheel bearing can seize up suddenly, which'd be really bad.