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Lotus Service Notes Section JL
Pressure Isolation (Pressure Maintain)
If signals received from the wheel speed sensors indicate imminent lock up of the LH front wheel, the first
step in the anti-lock sequence is to isolate that wheel brake circuit from the master cylinder. The ECM energises
the isolator valve solenoid, which closes the valve against spring pressure and maintains existing pressure in
the left hand front brake circuit regardless of any increase in pedal pressure.
Isolation valve
energised and
closed
Pressure
trapped
in LHF
brake
line
Inlet from
master
cylinder
j149b
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