VehiCROSS 4WD V6-3.5L (1999)
Hydraulic Control Assembly - Antilock Brakes: Description and Operation
Electronic Hydraulic Control Unit (EHCU)
The EHCU consists of ABS control circuits, fault detector, and a fail-safe. It drives the hydraulic unit according to the signal from each sensor,
cancelling ABS to return to normal braking when a malfunction has occurred in the ABS. The EHCU has a self-diagnosing function which can
indicate faulty circuits during diagnosis. The EHCU is mounted on the engine compartment front right side. It consists of a Motor, Plunger Pump,
Solenoid Valves and Check Valve.
On the outside, the relay box containing a motor relay and a valve relay is installed.
Solenoid Valves: Reduces or holds the caliper fluid pressure for each front disc brake or both rear disc brakes according to the signal sent from the
EHCU.
Reservoir: Temporarily holds the brake fluid that returns from the front and rear disc brake caliper so that pressure of front disc brake caliper can be
reduced smoothly.
Plunger Pump: Feeds the brake fluid held in the reservoir to the master cylinder.
Motor: Drives the pump according to the signal from EHCU.
Check Valve: Controls the brake fluid flow.
