Civic EX Sedan L4-1668cc 1.7L SOHC (VTEC) MFI (2001)
Brake Fluid Level Sensor/Switch: Testing and Inspection
Brake Fluid Level Switch Test
Check for continuity between the terminals (A) with the float in the down position and the up position.
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Remove the brake fluid completely from the reservoir. With the float down, there should be continuity.
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Fill the reservoir with brake fluid to MAX (upper) level (B). With the float up, there should be no continuity.