Tribute 4WD L4-2.3L Hybrid (2008)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
HYDRAULIC CONTROL UNIT (HCU)
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The HCU controls the brake assist function as well as the anti-lock function.
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The HCU contains an accumulator, driven by an electric motor, to supply pressurized brake fluid to the brake calipers during brake application.
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The electric motor begins to build pressure in the accumulator and initiates the brake system self-test whenever the ignition is turned to the ON
position, the brake pedal is applied, the vehicle doors are opened or when the dome light is activated.
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The accumulator discharges 4 minutes after the ignition switch is turned to the OFF position and the vehicle dome lights turn off, returning the
brake fluid used during the charging of the accumulator to the master cylinder reservoir.
