5A–6
BRAKE CONTROL SYSTEM
Pressure Isolation (Pressure Maintain)
The electro-hydraulic control unit is activated when the
brakes are applied which sends a signal to the coil
integrated module to prepare for a possible anti-lock stop.
If the information from the wheel speed sensors indicates
excessive wheel deceleration (imminent lockup), the first
step in the anti-lock sequence is to isolate the brake
pressure being applied by the brake pedal.
The microprocessor in the coil integrated module sends a
voltage to the coil to energize and close the isolation
valve. This prevents any additional fluid pressure applied
by the brake pedal from reaching the wheel. With the
isolation valves closed, further unnecessary increase in
the brake pressure is therefore prevented.
C05RW011
Legend
(1) Brake
(2) Master Cylinder
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