Manual 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.

NOTE: Before bleeding system, exhaust all vacuum from power unit by depressing brake pedal several times. Bleed master cylinder if equipped with bleed screws, then bleed wheel cylinders or calipers in sequence.

Depressurize ABS system (if equipped). Fill master cylinder. Install bleeder hose to first bleeder valve to be serviced. Bleeding sequence is RR, LF, LR, RF. Place other end of hose in clean glass jar partially filled with clean brake fluid so end of hose is submerged in fluid.
Depress brake pedal slowly through its full travel. Open bleeder valve 3/4-1 turn. Close bleeder valve. Release pedal. Repeat procedure until flow of fluid shows no signs of air bubbles.

NOTE: Check fluid level in master cylinder frequently during bleeding to insure air does not enter system.