Here is a link you can make your own bleeder from Home Depot.
You can get cap from junk yard.It worked great on my E320 with ASR.
Hope this helps.
http://faculty.ccp.edu/faculty/dreed/Campingart/jettatech/bleeder/index.htm

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1995 E320
1998 E320
1999 E320 4Matic
2000 E320 4Matic
2000 ML320
2007 C230 Sport
2003 Cadillac CTS