Diagnostic Aids

An actual low brake pressure condition would cause both the BRAKE and ANTI-LOCK lights to turn on. This flow chart addresses a condition where ONLY the BRAKE light is on. Most likely cause would be a short to ground on circuit No. 933 or a shorted pressure switch.

Fig 1: Brake Pressure Input Schematic

Fig 2: Flow Chart C1, Brake Pressure Input

Fig 3: Flow Chart C1, Brake Pressure Input