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Old 07-26-2000, 05:55 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The part they are talking about most likely is the vacuum proportioning valve MB# 123 070 00 46. MB list $143. Might be cheaper here.

It is a commonly misdiagnosed device but they do go bad. The replacement is very very easy. The adjustment is very, very easy for me. But a mess can be made if you don't have experience. The system runs on a fragile balance between a metered source and a controlled leak (the part in question).

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
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