Contents: Examination ↓ Replacement ↓
The dual master cylinder has one brake light switch each for the front and rear brake circuits.
Examination
Raise the front of the car, place it on supports, and remove the wheel.
Disconnect the wires from the front brake circuit brake light switch, turn on the ignition and press the brake pedal: the brake lights should come on.
Connect the wires to the front brake circuit brake light switch, disconnect the wires from the rear brake circuit switch, press the brake pedal: the brake lights should come on again.
If the lights do not light up in one of the two tests, the corresponding switch should be replaced.
Replacement
Disconnect the ground wire from the battery, remove the left wheel.
Mark the wires, disconnect them and unscrew the switch, while removing any leaking brake fluid with a rag.
Screw in a new switch (tightening torque 20-25 Nm) and connect the wires to it in accordance with the marks made.
Caution! After installing the switch, bleed the corresponding brake circuit.
Connect the ground wire to the battery.
Check the operation of the brake lights.
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