Description

PDWA Switch (Pressure Differential Warning Actuator) is part of the brake hydraulic circuit, bridging the two independent front and rear pressure lines.

It monitors the pressure balance between the two circuits. If either circuit loses pressure, the resulting differential trips the switch and illuminates the brake warning lamp on the instrument panel, alerting the driver to a hydraulic fault. Fitted to non-ABS (less Anti-Lock Braking System) applications.