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That motor isn't for the park brake. It is for the regular brakes. When it is buzzing away, there is a malfunction in the flow on the brake system or there is a fault in one of the 2 switches on the pump. There is one located on the brake reservoir and another mounted on the pressure line from the steering pump, mounted on the firewall.
Are you having a park brake issue as well on this? Do you have air park barke valve where there is a yellow knob on the dash or a pull handle park brake where you pull up a big handle to engage the park brake?
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