tom1979 · Oct 24, 2023

Has anyone measured the vacuum the alternator creates? Or know what it should be on a good Td5 alternator?

sierrafery · Oct 25, 2023

AFAIK it should be at least 0.55 bar for the brake booster to work well but i didnt measure it myself

tom1979 · Oct 27, 2023

sierrafery said:
AFAIK it should be at least 0.55 bar for the brake booster to work well but i didnt measure it myself

I tested a vehicle today, had a new alternator about 3 years ago (Denso) and it made 95kpa/0.95 bar of vacuum

sierrafery · Oct 27, 2023

tom1979 said:
I tested a vehicle today, had a new alternator about 3 years ago (Denso) and it made 95kpa/0.95 bar of vacuum

Then it's more than enough IMO... seems that they calibrated it to manage the brake booster and the EGR too

tom1979 · Oct 27, 2023

sierrafery said:
AFAIK it should be at least 0.55 bar for the brake booster to work well but i didnt measure it myself

Surprising really.