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The Brake Booster increases the force applied to the brake lever so that the brake disc or drum recieves more force. Without it the brakes would be much harder to apply.
Friction
Most common cause would be a loose brake caliper mounting bolts.
That would be a force that is applied at maximum power.
The BOO (Brake On/Off) Switch may need to be replaced. If it is bad, it would cause the brake lights to NOT illuminate when the brake pedal is applied.
you need to replace your brake pads. if you don't, in due time, they will wear down and put grooves on your rotors and that is NO bueno.
It depends on how fast you are traveling, how well your brakes work and how much braking force is applied. If you are going 1 mph and slammed down on the brake you would stop instantly. If you are going 100 mph and lightly touched the brake who knows when you would stop.
No. The booster only takes the pressure from your foot and multiplies the force being applied to the master cylinder. Plus if it was bad you would hear a distinctive hissing noise everytime you hit the brakes. You probably have a stuck caliper pin, clogged hose or stuck piston.
In general, warped brake rotors will cause a vehicle to shake when the brakes are applied. If the problem is severe, it will also have some impact on the ability of the driver to control the car when braking. If a car shudders or shakes when the brakes are applied but is otherwise smooth when driven, the brakes are a most logical cause. Use the link to the related question below to help you decide what to do if you suspect a warped brake rotor.
check for loose caliper bolts, brake pad may be moving around in caliper or caliper bracket. missing or broken brake hardware.
Parking brake applied or stuck on.Incorrect fluid level in trans. Transmission is bad.
your brake pads have worn out, so i would get some new ones if i were you.