Subaru 26401AC190 Master Cylinder Assembly

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Place shop rags underneath the brake master cylinder to catch any spilled brake fluid, then remove the brake fluid from the reservoir. Unplug the electrical connector for the brake fluid level indicator. Place rags or newspapers under the brake line fillings. Using a flare-nut wrench, unscrew the brake line tube nuts and allow any residual fluid to drain onto the rags. Remove the nuts that attach the brake master cylinder to the power brake booster. Remove the brake master cylinder from the engine compartment, being careful not to spill any fluid. If a new brake master cylinder is being installed, check and adjust the booster pushrod length. Bench bleed the new brake master cylinder before installing it. Attach a pair of brake master cylinder bleeder tubes to the outlet ports of the brake master cylinder. Fill the reservoir with brake fluid. Slowly push the pistons into the brake master cylinder to expel air. Repeat the procedure until no more air bubbles are present. Remove the bleed tubes and install plugs in the open ports. Replace the O-ring seal on the brake master cylinder (if equipped) and then place it over the studs on the booster and tighten the attaching nuts only finger tight at this time. Thread the brake line fittings into the brake master cylinder. Fully tighten the mounting nuts, then the brake line fittings. Fill the brake master cylinder reservoir with fluid, then bleed the brake master cylinder and the brake system. The remainder of installation is the reverse of removal. Test the operation of the brake system carefully before placing the vehicle into normal service.

Place some rags or newspapers under the brake line fittings.