When you get your new mountain bike with either mechanical or hydraulic disc brakes you might find that they aren’t very good and have a lack of stopping power, don’t panic they just need bedding in.
Ever manufacture give different advice but as a rule of thumb a mixture of slower gentle stop at first and then a few harsher stops from a high speed will soon see your disc brakes working well within around 10 minutes you can have them bedded in fully.
There is such a great difference in stopping power. I’ve just bedded in my front brake and its now at the point where it wants to stop you compared to the back brake which is still very shit. and it just feels like its making contact but not working.