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Lotus Service Notes
Section JL Pressure Reduction Once the LH front wheel brake circuit has been isolated from the master cylinder, the pressure must be reduced in order to allow wheel speed to be restored. This pressure reduction is achieved by the ECM energis- ing the dump valve solenoid, which then opens against spring pressure and bleeds off some of the fluid into the low pressure accumulator shared with the RH front circuit. Very short activation pulses are used to maintain close control of the pressure reduction, and to limit the reduction to that required to restore wheel speed. Fluid displaced from the wheel brake circuit is stored in the front brake accumulator against spring pressure, and is also used to prime the hydraulic pump. Isolation valve Dump valve energised and energised and closed open Fluid bleeds off from LHF circuit Inlet from master cylinder
Pump is primed Low pressure accumulator charged
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