I posted here a few months ago because the automatic transmission in my
'87 w124 had stopped shifting up smoothly (especially at less than full
I took it to my mechanic last month and after checking the vacuum system
they determined that the cause was a defective vacuum 'switch' in the
transmission. It was replaced last week. They had to get an MB mechanic
in after hours to get things working properly, but now everything runs
smoothly again. The switch cost 75 EUR excl tax and the whole repair
cost me 190 EUR.