Brake Fluid Level Sensor/Switch: Testing and Inspection

INSPECT BRAKE WARNING LIGHT
a. Inspect the parking brake warning light.
1) Disconnect the connector from the parking brake switch.
2) Turn the ignition switch to ON.
3) Ground the terminal of the wire harness side connector, then check the parking brake warning light.
OK: Brake warning light comes on.

b. Inspect the brake fluid level warning light.
1) Disconnect the connector from the brake fluid level warning switch.
2) Turn the ignition switch to ON.
3) Connect a terminal to other terminal of wire harness side connector, then check the brake fluid level warning switch.
OK: Brake warning light comes on.

INSPECT BRAKE FLUID LEVEL WARNING SWITCH
a. Remove the reservoir tank cap and strainer.
b. Disconnect the connector.
c. Measure the resistance between the terminals.
Standard: Float up (switch off): 10 kOhm or higher

d. Use a syphon, etc., to take fluid out of the reservoir tank.
e. Measure the resistance between the terminals.
Standard: Float down (switch on): Below 1 Ohm

f. Pour the fluid back in the reservoir tank.
g. Reconnect the connector.