Electro-Hydraulic Unit; To Remove Electro-Hydraulic Unit - Lotus Evora Service Notes

Lotus Service Notes
JL.12 - ELECTRO-HYDRAULIC UNIT
The electro-hydraulic unit is located on the front side of the driver's toebox, and is accessible from below
after removal of the front undertray. The protective cover may be removed after slackening the two retaining
nuts. The unit is secured to the mounting bracket via two studs and a bottom spigot, all supported in flexible
grommets. The mounting bracket is fixed to the chassis by four bolts. A single 38 pin connector plug with a
cam lever is provided to connect the vehicle harness to the control module.
CAUTION: Do not disconnect or connect the main connector plug with the ignition switched on. Switch
off the ignition and disconnect the harness before carrying out any electrical welding operations on
the car.
Hydraulic pipe connections to the unit comprise two input pipes from the master cylinder (one for the front
circuit, one for the rear) and four output pipes, one for each of the wheel brakes. Note that all hydraulic con-
nections are identified by engraved markings on the unit:
Input:
MC1 From master cylinder rear port (front brake circuit)
MC2 From master cylinder front port (rear brake circuit)
Output:
FL Front left
FR Front right
RR Rear right
RL Rear left

To Remove Electro-Hydraulic Unit

When removing the unit, beware of dripping brake fluid and take appropriate precautions to prevent dam-
age to paintwork.
1. Raise the vehicle and remove the front undertray. Remove the module protective cover.
2. Switch off the ignition before pressing the release tab and folding back the cam lever to disconnect the
harness plug.
3. Label each of the hydraulic pipes before disconnecting from the unit and immediately capping the pipes
and plugging the ports to reduce the spillage of brake fluid, and to prevent the ingress of dirt.
4. Release the four bolts securing the mounting bracket to the chassis and withdraw the bracket with ABS
unit.
5. To remove the unit from the bracket, release the two retaining nuts from the studs and slide the unit from
its three grommets.
6. To refit, reverse the removal procedure, taking care to connect the brake pipes correctly:
Mounting bracket to chassis;
Modulator inlet pipes;
Modulator outlet pipes;
7. Bleed the unit of air (see Sub-section JL.3).
8. Verify correct connection by using the 'Lotus Techcentre' tool in actuator tests with the car on a wheel free
lift. Check that operation of each solenoid valve affects the appropriate wheel.
Note that the ABS controller is calibrated specifically for the Evora. Do not use parts from other
sources.
Page 20
24 Nm
18 Nm
16 Nm
Section JL