The first thing I would check or do would be to remove the rotors and check their condition. If they have enough surface left, have them turned to get them true again. If they can't be turned, then replace them with new (which should also be turned or at least checked .The most common cause of pulsating brakes, I have found, are warped rotors. This is usually caused from overheating.
A disc brake rotor with excessive run out is a warped rotor which causes a pulsation in the brake pedal when the brakes are applied. A certain amount of run out is acceptable.
Sometimes you can have a a pulsation while the brakes are adjusting after you have turned the rotors. You could wait a couple days and see if it corrects itself.
Warped brake rotors will cause pulsation (or vibrations at high speeds) when the brakes are applied. This may also go on to misalign the calipers and cause other vibration related damages.
negative acceleration (deceleration) this is a very vague question as there are so many factors to consider: are the brakes appled, how much of the brakes are applied, condition of brakes, condition of the tyres, suspension setup, clutch slipping, condition of cv joints, surface the car is traveling on
CHECK WHEEL BEARINGS
if you are driving and you go to stop, then that means that the front rotors are warped. if the front rotors are bad, you will feel a pulsation in pedal while applying brakes. change rotors on front.
Kinetic friction is the force that stops a train when the brakes are applied
The driver suddenly applied the brakes.
The answer depends onhow hard the brakes are applied,the quality of the brakes,the quality of the tyres,the quality and condition of the road.
should brakes be kept in a good condition
no
The answer depends on the mass of the train and the force applied by the brakes.