i do it the same way with one difference.i have the end of the tube immersed in brake fluid in the jar.i'm sure you do it this way as well but forgot to mention it

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)