I have never had to use an impulse counter. I think what it is used for is to put the system into a diagnostic mode so there is no possibility of the system activating and sending pressure your way while bleeding.

There is a system accumulator. You can bleed it from a service port on the pump.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS