Eagle L4-150 2.5L (1983)
Fig. 6 Pressure differential valve and brake warning light switch
As pressure falls in one system, the other system's normal pressure forces the piston to the inoperative side, contacting the switch terminal, causing the
warning light on the instrument panel to glow.
Fig. 7 Delco-Moraine aluminum dual master cylinder with built in warning light switch
The switch mounted directly in the master cylinder assembly. Whenever there is a specified differential pressure, the switch piston will activate the brake
failure warning switch and cause the brake warning light to glow.
Fig. 8 Typical pressure valve and brake warning light switch.
