Brake Master Cylinder. First, screw off the old brake pipe of the master brake cylinder, and then remove it from the vacuum booster. Master Cylinder Material: Aluminum. 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.
