BRAKES 19 (ii) Hydraulic Control Unit (HCU) General: It consists of a Return Pumps, Solenoid Valves, Accumulator and Motor. It forms the link between the TMC and the foundation brakes. It implements the commands issued by the ECU by using solenoid valves to control the pressure at the foundation brakes. There are four pairs (4-channel system) of Inlet and Outlet valves and are located in the upper section of the modulator. Solenoid valves are responsible for modulating the pressure in the brake cylinder during active ABS control. The Return Pump element is installed in the center of the modulator and is driven by an electric Motor. The pump transfers the brake fluid emerging from the wheel brakes through the accumulator on its way back to the TMC. The pump actuation can be felt on the foot pedal as pulsations. Accumulator are Located in the lower section of the hydraulic modulator. The accumulator absorbs the surge in brake fluid that accompanies the pressure reduction phase. HYDRAULIC CONTROL UNIT
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