F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Brake Fluid Level Sensor/Switch: Description and Operation
The fluid level indicator is an integral part of the brake master cylinder reservoir. It is serviced as a part of the brake master cylinder reservoir. It consists
of a float containing a magnet and a reed switch. When the fluid in the brake master cylinder reservoir gets to a predetermined level, the magnet actuates
the reed switch, causing the red brake warning lamp to light. Loss of fluid from either the primary (front) or secondary (rear) system will cause this
system to actuate.