4 Runner 2WD V8-4.7L (2UZ-FE) (2003)
Brake Fluid Level Sensor/Switch: Testing and Inspection
INSPECT BRAKE FLUID LEVEL WARNING SWITCH
a. Inspect the continuity.
1. Remove the reservoir tank cap and the strainer.
2. Disconnect the connector.
3. Check that the continuity exists between the terminals.
Float up (switch off): No continuity
4. Use a syphon, etc., to take fluid out of the reservoir tank.
5. Check that the continuity exists between the terminals.
Float down (switch on): Continuity
6. Pour the fluid back in the reservoir tank.