I have always undone the bleed screw since * see below - with a bleed tube plus one way valve attached.. and the hose to the caliper clamped with a brake hose clamp.
* I have found older master cylinders problematic and ruined a 10 year old Mark 3 Fiesta one by attempting to push back teh piston without cracking the bleed nipple. Mind you.. the car was a heap - which then passed MOT tests for 5 years with a new master cylinder..(£110 ish).
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