BRAKE Warning Indicator

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The parking brake switch is hardwired to the smart junction box (SJB) and the brake fluid level switch (part of the brake master cylinder) is hardwired to the ABS module. The instrument cluster BRAKE warning indicator uses 2 inputs. The first input is provided by the parking brake switch and, when applied, provides a ground to the SJB which sends a signal over the communication network to illuminate the BRAKE warning indicator. The second input is controlled by the ABS module. The ABS module, upon receipt of a low brake fluid level signal or base brake system concern, provides a brake signal to the instrument cluster over the communication network. The instrument cluster, upon receipt of the brake signal, turns the BRAKE warning indicator on or off according to the monitored data.