I have always used one of those hoses with the ball valve in them for bleeding which is based on the master cylinder pushing fluid to the brake to bleed the system.

When I bought my mity vac, with the bleeder the first thing I did was my 240 and man it made the job easy. You can sit right there with it, watching the fluid (ugh) and do the job without having to go pump the brake then guess if the line still has air.

In other words, it worked great for me.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique