Somebody adapted his motive pressure bleeder and an old coolant cap which does the same job it's very nice that with the 1/2g size air tank is very friendly to volume changes not changing pressure and a decent pressure gauge. I've been wanting to do the same and kicking myself for not keeping the old caps when replacing EITHER of my reservoirs.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)