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An interesting idea
It feels like the brake test equipment might offer the best fittings etc. to obtain a good seal but, I'm guessing, that it'd take ages on anything but a small mould to extract the air. The internal volume of a brake system would be very small, I would have thought. I'm not certain that the fluid transfer system would provide the necessary air-tight system to make it a worthwhile consideration.
You can infuse parts without having a pump constantly running during the infusion, but you're like to get voids and evidence of air still within the part once cured. I have, on a couple of occasions, neglected to open the valve on the pump when starting to infuse and although the part did infuse okay, it was evident that the usual de-gassing of the resin during the process had not happened which left a less than perfect end result. That said, it was surprisingly good, considering.
Another option to consider might also be the vacuum bags used for the storage of clothes and duvets. These are pulled down using a vacuum cleaner and are pretty cheap and widely available via e-Bay.
A little risky if you struggle to get a perfect bag seal, but if your intended part is a one-off and you're prepared to accept a bit of trial and error and the likelihood of less than perfect cosmetic results then maybe worth a go? It might also be more productive to think about wet-laying your part and just using the alternative method chosen to vacuum bag afterwards. At least you might get a bit of benefit with improved consolidation.
I, for one, would be interested to see what kind of results you can achieve though with whatever method you try out.
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