The brake system on the H3 uses a high pressure accumulator versus a vacuum diaphragm for assist. The ABS pump motor will run even during base brake (non-ABS) operation, so this might be what you hear.
In many other ABS systems, the power assist is provided by vacuum, thus the pump only needs to run during ABS operation.
The pump motor is located in the engine compartment near the master cylinder.
Important information when working on the hydraulic system near the pump, accumulator, master cylinder, etc. With the ignition off, pump the brakes at least 20 times to decrease the pressure inside the accumulator. The accumulator will hold some high pressure, and brake fluid shot into your eye would be a big bummer.
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Black Sheep Hummer Squadron
(ME TOO)
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