Valve Block Assembly R & I: Notes
WARNING: This page does not describe the selected car, but rather 14 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.
CAUTION:
Before servicing any component which contains high pressure, it is mandatory that hydraulic pressure in the system be discharged. With ignition off, pump brake pedal a MINIMUM of 20 times using full pedal strokes. When a definite increase in pedal effort is felt, pump pedal 2 more times.