If it were my car I would check the vacuum line going to the vacuum modulator, the rubber hose that connects and also check to make sure the modulator on the side of the transmission is in good shape.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)