I definitely wouldn't clamp them, but that's more from a general mechanical "niceness" than any particular knowledge on the subject
Personally, since I got a decent vacuum brake bleeder I no longer worry about losing fluid when doing brake work as its so easy to bleed the system and gives you an opportunity to get good fluid back in.
Mine is a "Mighty Boy" brand vacuum bleeder that runs from compressed air (so you need a compressor to use it). Hands down one of the most useful tools in my workshop
I usually put a few layers of cling film over the brake reservoir to slow down the leakage while things are disconnected, but just let it drain into a container while I do the work, then reconnect and bleed afterwards.
Aluminium foil is good as a generally blanking material for fittings so that gunk etc doesn't get in, but it wont stop fluid getting out.
Steve


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