RAM 2500 Truck 2WD V8-5.7L VIN D (2004)
Brake Fluid Level Sensor/Switch: Description and Operation
BRAKE FLUID LEVEL SWITCH CIRCUIT
The switch signals the CAB for a hydraulic fluid problem. The antilock system uses input from the brake fluid level switch when activated. A low
brake fluid condition in the master cylinder will close the switch circuit and read 0 volts. When the brake fluid level is at specifications, the switch will
open and circuit sense voltage will read 5 volts. This signal tells the CAB if there is enough brake fluid in the master cylinder to have an antilock
operation. The brake fluid level switch is located in the master cylinder with 10k resistor. The switch is a Hall effect design and uses a float to
determine level.
