On my W124 car, there is a switch over valve mounted on the firewall behind the brake master cylinder.
It has a black line (electrical) and a green line (vacum) connected to it.
The green line goes to the upshift delay valve on the side of the transmission.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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