Question:
On an empty road turn off the engine, pump the brakes gently several times until there's no servo and the pedal gets rock hard. (Yup, if you can't think how to do this professionally, without killing some-one, you'd better not try!)
Do you now have "ice-mode" and have to push madly for any effect?
If so then ABS action is probably "beating" the vac servo (which on a 370 is a bit different anyhow).
Cure? Maybe a big vac tank or a diesel vac pump (diesels have no manifold vac)
Just a thought, Fritz
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