Hydraulic Brake Bleeding

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1990 Pontiac Bonneville, 1990 Oldsmobile Ninety-Eight, 1990 Oldsmobile Eighty-Eight, 1990 Cadillac Fleetwood, and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: ABS systems are under high pressure under normal operating conditions. Before opening the fluid reservoir or before servicing any component of an ABS system, it is mandatory that system pressure be discharged. To discharge system, turn ignition off and pump brake pedal a minimum of 20-25 times using full pedal strokes. When a definite increase in pedal effort is felt, pump pedal 2 more times.

Hydraulic system bleeding is necessary any time air has been introduced into system. Bleed brakes at all 4 wheels if master cylinder lines have been disconnected or master cylinder has run dry.

Bleeding may be done either by using pressure bleeding equipment or by manually pumping brake pedal and using bleeder tubes.