Diagnostic Aids

WARNING: This page is about a different car, the 1988 Buick Riviera and 1988 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.

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. 33 or a shorted fluid level sensor switch.

Fig 1: Low Brake Fluid Input Schematic

Fig 2: Flow Chart C2, Low Brake Fluid Input

Fig 3: Flow Chart C2, Low Brake Fluid Input