What is the difference between a mechanical disc brake, a hydraulic disc brake and an ordinary disc brake?

At present, the mechanical disc brake of a bicycle is no different from that of a linear disc brake, that is, an ordinary disc brake.
The difference between hydraulic disc brake and linear disc brake
1. The difference of force transmission type
The linear pull disc brake (wire disc) is to pull the brake lever by hand, so that the steel wire in the cable tube connected between the brake lever and the brake caliper is tightened, driving the brake clamp to tighten, so that the collar is clamped on the disc Apply the brake. When the hydraulic disc brakes, the hydraulic pressure from the master cylinder is sent to the sub-cylinder, so that the brake shoes are clamped to the brake disc to achieve the effect of braking.
2. Security
Hydraulic disc brakes are safer than traditional linear disc brakes
3. Weight
The components of the bicycle are designed to be lightweight, and the hydraulic disc brake system is lighter than the linear disc brake system.
4. Extensive use
Wire discs are cheap, easy to maintain and replace, which is its advantage. The steel wire can be replaced if it is folded. Materials are easy to find. The oil dish is troublesome to replace due to process problems, and the cost is high.