Car Brakes?

yes. but usually the fronts take 70% of the load.

Yes, if your brakes are adjusted correctly, all the braking surfaces should come into play when you are stopping. By the nature of cars, the front brakes carry a higher percentage of the braking load, that is why they wear out faster. This was also true when all 4 wheels were drum brakes and is also true in cars with 4 wheel disk brakes.

Are you talking motorcycle or car?

In a car, there's always some kind of proportioning valve to get the rear brakes to provide 30% of the braking, and 70% to the front.

Older cars don't have proportioning valves, and all the brakes get the same hydraulic pressure. Sometimes the rear brakes were half the size and that provided the different ratio, but none of my old cars have larger brakes in front. That's why rear brakes sometimes locked up on those old slugs.

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Yes but they only do 10% or 15% of the total stopping power

yes , they do. but the front brakes tend to lock up to stop the car first. this is y the car tilts forward becaust the front brakes lock and the momentum of the car is still going.

drum brakes work when you step on the pedal, but account for about 20% of your raking power. when you use your E-brake, that goes to the drums only.

no, it does not, it just brake the front

the rear brake is weak, it does not have alot of stopping power

Yes both breaks work together to help stop the vehicle.

yes

yes plain and simple.