You have to remove the cap from brake fluid reservoir to prevent the reservoir from popping out of the master cylinder or busting the seal in between and not to allow air from the fluid to escape. When you push the piston back in callipers the bubbles (trapped air) will not escape through the reservoir.
Definitely not these bubbles that are in the callipers.
The manuals are written for mechanics not for diy, that’s why they’re not as detailed as you would like it to be. It would be very frustrating, if they would write every detail or movement of the hand how to do this and that.
As for the YouTube diy videos, they usually come from places that are selling something and don’t have to be mechanics, hence some details aren’t there because their luck of knowledge and experience, like remove the reservoir cap, importance to use the right grease and where to apply it.![]()
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