Wet figures above show the drop in performance when the fluid has a certain water content (less than 3%).  For example when DOT 5.1 is contaminated with 3% water (which is considered a lot) performs almost as well as basic DOT 3 in prime condition. The most important thing to do is regularly change your fluid - we suggest every three months but manufacturers suggest at least once every twelve months. After six months use a typical DOT 3 fluid may have had it's boiling point lowered from 205 degree's C to about 165 degree's C 

QUESTION - What are the pros and cons of fluids ?

DOT 3 and DOT 4 are hydroscopic - they allow water to be absorbed into the fluid. This means that when heated up a fluid with water in it will boil more quickly (water boils at a lower temperature than brake fluid) which will lead to cavitation. DOT 5 does not absorb water and will not strip paint work but as the water is not absorbed it simply sinks to the bottom of the system which is usually the caliper where operating temperatures are very high. Water in the caliper is bad as it can cause corrosion within the caliper although silicone fluids contain corrosion inhibitors and as water has a lower boiling point than fluid (100 Degree's C) there is more chance of boiling under relatively light braking. Glycol based fluids can strip paintwork where as silicone based do not. Silicone fluids also have a very long life which is why it is used in military vehicles which may be stored for years without use but be expected to be ready for action at a moments notice. 

QUESTION - Do -02 lines give more pressure than -03 lines ?

No - the fitting of the smaller dash 2 hoses sold by some manufacturers makes NO difference to the pressure produced at the caliper as is commonly believed. There are no substantial benefits associated with the use of dash 2 hoses except that the manufacturer can charge you more for them. The only way to increase pressure coming out of the system is to increase the pressure going into the system. 500 psi in equals 500 psi out - Fluid cannot be compressed to a lesser volume, no matter how high the pressure and Pressure is equal over all surfaces of the containing system .

QUESTION - What is the difference in performance between two full length front lines and an over the mudguard line kit ?

Nothing except for the way the system looks. Both systems operate in exactly the same way and give you the same performance. As the system is a closed hydraulic system without air in it when the fluid moves at one end the same movement takes place at the other end. Because they have different lengths doesn't mean that the system will work slower at one end than the other. Imagine pushing two sticks away from you which are both 6" long - the ends both move at the same time. Now imagine pushing two sticks - one is 6" and the other is 36" - the ends still both move at exactly the same time. So the over the mudguard gives the same performance as the 2 full length - it's just which you prefer.

QUESTION - What's better - three front lines using the oem splitter, 2 full length fronts or 2 fronts with one over the mudguard ?

As we have said above the three systems give the same performance but the three line front has an additional 2 possible leak points in the system, is heavier and harder to bleed than 2 front lines. It is easier to fit though as you follow the oem setup. Another thing to remember is do you race or use the bike on track days ? If so go for the 2 full length front as in the UK one of the ACU rules state that you are not allowed an over the mudguard system unless it is an original system.

QUESTION - Friction

Friction is resistance to sliding. Any two objects in contact with and trying to move relative to each other have friction. This can be low or high depending on the types of surface in contact. If two surfaces in contact are sliding, the friction produces heat. In braking systems friction is used to produce heat. 

The process of creating this heat stops the motorcycle. The amount of friction between two surfaces depends on the materials and their roughness. 

The amount of friction is described by a number called the coefficient of friction. This number is obtained by Friction Force being divided by the Perpendicular Force. To make matters more complicated the coefficient of friction has two different values. It is higher when there is no sliding but as soon as the surfaces start to move relative to each other the friction coefficient drops to a lower number. 

This is why it is harder to start something sliding than it is to keep it sliding. After sliding starts it is called dynamic coefficient of friction.  The higher the number the higher the amount of friction and the lower the number the lower the amount of friction.