First, how is 4 pistons better than 2 pistons?
To start with, 4 piston brakes undergo less brake fade.
Brake fade refers to a brake’s loss of power when under heavy use. As brakes with 4 pistons shed heat better than those with only 2 pistons, they tend not to get as hot, especially on descents, resulting in less loss of power. This means 4 piston brakes last longer in generating the friction needed to stop bikes in an appropriate amount of time.
Also, 4 piston brakes enjoy better modulation.
Modulation is a term describing how precisely and accurately you can control the brake’s power output. Brakes with a low level of modulation will give you a very noticeable “on-off” feeling. In contrast, those with great modulation are able to make the braking process sensitive and, at the same time, smooth. This means that if you squeeze the lever gently, the brake will have a bit of power. If you really squeeze it, your bike will brake hard. With a higher level of modulation, you will have greater control of the bike, which is especially nice when you go downhill.
Now let’s talk about hydraulic.
Compared to their mechanical counterparts, hydraulic brakes are more powerful and responsive, which means they can stop your bike faster and more safely. They also require less hand effort and maintenance, bringing more comfort and convenience. Last but not least, hydraulic brakes are more weather-resistant and tolerant of tight bends.
This is not to say hydraulic brakes don’t have any disadvantages (higher cost, complexity, potential for leaks or air bubbles). However, these are easily outweighed by the benefits they offer for bikers seeking performance and reliability.