Brake Fluid Pressure Sensor/Switch: Service and Repair

Pressure sensor, master cylinder, replacing

Preparations for replacing the pressure sensor on the master cylinder
(5-cylinder naturally aspirated engine)Remove the air cleaner (ACL) and preheating hose, see:
Left-hand drive, Master cylinder, replacing, L.H.D Master Cylinder, Replacing, L.H.D
Right-hand drive, Master cylinder, replacing, R.H.D Master Cylinder, Replacing, R.H.D
Cars with turbocharger (TC):
Remove the air hose between the air cleaner (ACL) and the turbocharger (TC).
Remove the relay box. Master cylinder, replacing, R.H.D Master Cylinder, Replacing, R.H.D

Removal

Preparations for checking the pressure sensor




Turn on the ignition.
Press the dynamic stability and traction control (DSTC) button on the dashboard (the green lamp lights in the button) so that the DSTC system is engaged.

Checking pressure sensor








This check assumes that other faults that were diagnosed in the system have been rectified.
Switch off the ignition.
Disconnect one connector from one of the sensors.
Take out a new sensor.
Install the connector on the new sensor.
Switch on the ignition. Check whether the symbol on the dashboard lights or not.
If the symbol does not light the fault was in the old sensor. Test with the other sensor if the symbol lights.

Note! Reconnect the connector to the sensor after each test (the connectors should not be mixed up.)

Replacing the pressure sensor. See Preparations before replacing the pressure sensor

Preparations before replacing the pressure sensor




Apply the brake pedal lightly using a pedal jack.
Position paper under the master cylinder (to collect any brake fluid spillage).
Disconnect the connector from the pressure sensor.

Replacing the pressure sensor




Remove the pressure sensor using an extended socket.

Installation

Installing the pressure sensor




Install the pressure sensor.
Tighten to 25 Nm.
Connect the connector.
Remove the pedal jack.

Checking the pressure sensors visually




Switch on the ignition. Wait for 5 seconds. The symbol on the dashboard should go out.

Bleeding the brake system
With the bleeding unit. Brake system, bleeding (using bleeding unit) Brake System, Bleeding (Using Bleeding Unit)
Without the bleeding unit. Brake system bleeding Brake System Bleeding

Airing
Bleed the circuit that the pressure sensor is on.
If both the pressure sensors have been replaced, bleed the whole system.

Checking the brakes
Brake disc front, calibrating Brake Disc Front, Calibrating Brake disc rear, calibrating Brake Disc Rear, Calibrating

Relay box - air cleaner (ACL) housing
Brake pipe master cylinder / ABS unit, replacing, B5254T2 Brake Pipe Master Cylinder / ABS Unit, Replacing

Air cleaner (ACL)
Brake pipe master cylinder / ABS unit, replacing, B5254T2 Brake Pipe Master Cylinder / ABS Unit, Replacing