Vacume pump on alternator failed or pipe loose to brake servo cylinder,check where you top up brake fluid big round cylinder with plastic pipe to it, pull pipe out and start engine and see if its sucking if not check pipes to pump! either bad connection on pipe or pump failed
Booster unit has failed or not getting vacuum from engine. Check vacuum line from intake to booster unit. If vacuum is good, diaphram may have failed inside the booster.
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