Page 19
Lotus Service Notes Section JL
Brake Release
When no further wheel locking is sensed by the ECM, the ABS becomes inactive with the isolation valve
open (solenoid de-energised) to allow direct communication between the master cylinder and wheel brake
circuit, and the dump valve closed (solenoid de-energised) to seal off the pressure relief circuit. The pump will
remain running for a short time to help drain any fluid from the accumulator, whose piston is returned to its start
position under the action of the spring, and return the fluid to the master cylinder reservoir.
Isolation valve
de-energised
and open
Output
to LHF
brake
Inlet from
master
cylinder
Pump runs
for short
period
Fluid scavenged from
low pressure accumulator
j149e
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