Hydraulic Control Assembly - Antilock Brakes: Description and Operation

Modulator Unit





The modulator unit consists of the inlet solenoid valve, outlet solenoid valve, VSA NO (normally open) solenoid valve, VSA NC (normally closed) solenoid valve, reservoir, pump, pump motor, and the damping chamber.

The hydraulic control has three modes at ABS action; pressure intensifying, pressure retaining, and pressure reducing. And pressure adding mode is combined at TCS, VSA, and brake assist action.

The hydraulic circuit is an independent four channel type, one channel for each wheel.