Quote:
Originally Posted by Frank Reiner
Physically, either one will bolt to the booster.
The earlier one has a 15/16" front circuit bore, the later one a 1" front circuit bore. The change in bore results in a difference in pedal feel & stroke.
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They are showing two different part numbers for 1984 300SD and a 1985 380SE. Was the change due to antilock systems being added to the w126 between those years?