it is friction and when the water goes on the brakes and tires they bond together
yes it is for wet brakes
All four brakes should engage at the same time. You probably need to bleed your front brakes. If road conditions are wet or you haven't driven the car in a while, drum brakes sometimes "grab". Many cars have rear drum brakes and front disc, this could be what you're expieriencing.
Yes, that will work.
If you are driving on wet roads there is no way to avoid those effects. Most brakes dry out very quickly when applied.
Rim brakes don't work well in the rain, because the rims get slippery when wet. But not all hand brakes are rim brakes. A hand activated drum brake will work just as well in the wet as in the dry.
It's hard to describe. It is wet and sort of slimy. It is strong and has lots of muscles, but it will slip through your fingers if it wants to. The suckers will grab on, but they don't hurt.
While driving, apply the brakes gently for a short distance, as you maintain your speed.
When that happens to me, I "fan" the brakes until they dry. "Fanning" is lightly applying the brakes and releasing several times in succession. The heat caused by the friction will dry out the pads after a few "fannings". You want to do this right after you run over a puddle of water, don't wait till you get to a stop sign or until you have to stop suddenly to find that your brakes are sticking and not working properly.
the advantages of dick brakes over rim brakes are if you go through mud or watter the rim brakes tend to fail when wet but disk brakes are higher off the ground so they will not get wet as often and sense the callapers are closer to the disk brake
The answer will depend on the quality of the brakes on your motorcycle, how hard you apply them, the road conditions (dry/wet). So there is no single answer.
How to bless a wet brake system
Your brakes are either wet from the rain that has gathered within your wheels, or you need new brakes!