Shudders at idle in gear w/ brakes on

[i-xclr8]

I think this is my first posting. I did a search with no luck. My wife's '99 ml430 shakes when the brakes are applied at idle speed or driving at a crawling speed with a foot on the brake. My first thought is a vacuum leak to the brake booster ....or a failed check valve...or something related. I looked at the booster and did not hear anything strange, but I saw some strange wiring on the booster. I'm thinking that something too "smart" here may be acting "stupid" if there is a failure somewhere. Anyone heard of this? Or, are there common problematic parts within this system that could cause these symptoms. Thanks, Jon Sometimes I think I should stick with Japanese cars since I'm into 300 zx twin turbos. http://i82.photobucket.com/albums/j2...8/DSC04067.jpg

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[busoptr]

you should check your engine mounts