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replaced. (Refer to 2 - SUSPENSION/FRONT/HUB / HCU (HYDRAULIC CONTROL DESCRIPTION The hydraulic control unit (HCU) consists of a valve body, pump, two accumulators and a motor OPERATION The pump, motor, and accumulators are combined into an assembly attached to the valve body. The During normal braking, the HCU solenoid valves and pump are not activated. The master cylinder and The valve body contains the solenoid valves. The valves modulate brake pressure during antilock brak- The HCU provides three channel pressure control to the front and rear brakes. One channel controls During antilock braking, the solenoid valves are opened and closed as needed. The valves are not During antilock braking, solenoid valve pressure modulation occurs in three stages, pressure decrease, PRESSURE DECREASE The inlet valve is closed and the outlet valve is opened during the pressure decrease cycle. A pressure decrease cycle is initiated when speed sensor signals indicate high wheel slip at one or Fig. 8 Rear Wheel Speed Sensor Location 1 - DIFFERENTIAL HOUSING Fig. 9 Exciter Ring Location 1 - EXCITER RING Fig. 10 Tone Wheel 4x2 1 - HUB 5 - 40 BRAKES - ABS AN TONE WHEEL (Continued) |