Brake Master Cylinder. 1987 - 1991 Buick Century GM Brake Code JA8; FWD. Screw off the reservoir cap, fill the tank with brake fluid, open the bleed screw of brake wheel cylinder or caliper, and then exhaust the air in the whole brake pipeline, then add the brake fluid to about 5mm below the maximum scale mark of the storage tank, and then tighten the reservoir cap.
