If he pulled out in front of a car driving on the street and it struck his car, then he is At Fault. If he was rear-ended by the car following, then the following driver is at fault.
The driver suddenly applied the brakes.
Any sudden brake loss can be the cause of 1. brake line damage 2. master cylinder disfunction
Because you are decelerating sharply
Your experience when a moving vehicle suddenly brakes or a parked vehicle suddenly accelerates are some of many examples in reality.
You probably need to change your back brakes.
law of inertia
passenger were hitched when the bus driver suddenly applied the brakes
If all the passengers are properly buckled in and the car brakes suddenly to a stop, someone may spill their coffee.
I am not a qualified expert on brakes but a brake job of that price seems fair if your brakes are completely shot and are in need of massive repair job.
no its completely illegal