Why don't disc brakes work on a bike? Bicycle brake replacement.

Sometimes a bike doesn't brake well, even with good brake components.
The bicycle has a very long stopping distance.
In this video I will show you how to replace a mechanical disc brake caliper and rotor on a bicycle. I will use a Tektro MD-M280 mechanical brakes caliper and a Shimano rotor.
It will be useful and interesting for cyclists!
This video tutorial "DIY" for cyclists. Video tutorial in "ASMR" style.

00:00 The bike has a very long stopping distance.
00:58 Bike brake caliper removal
01:29 Testing new disc brake caliper
02:22 Compare old brake pads with new ones
03:37 Disc brake rotor sm-rt26 in macro video
03:53 Removing the rear wheel
04:23 Brake disc is very dirty
05:05 Bicycle disc brake under microscope
05:14 Cleaning bicycle wheel
07:09 Cleaning the disk brake rotor
08:00 Installing a new disc brake caliper
08:20 Adjusting your disc brakes
09:19 Testing new disc brakes after service
09:59 Bicycle brakes are very good