Grub screw removal

[Cyclistbruce]

Am going to replace the grub screw from my front calliper with a speed bleeder valve. Assuming when I remove the grub screw it'll pish brake fluid everywhere so presumably I have to drain it down completely first. And if so am I best pushing in the callipers first?

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[Steptoe]

You'll lose very little brake fluid if you have the replacement bleed nipple at hand ready to insert as you remove the old bleed unit.