If there is vacuum at the reservoir and none at the control head , you have to trace the supply line through the firewall to the control head and repair or replace it to repair the leak ( blockage).
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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