Acura 46100-SDB-A11 Brake Master Cylinder Assembly

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To remove the brake master cylinder, start by taking off all engine and cowl covers as equipped, followed by the strut brace. For models from 2004 and later, remove the mounting bolts for the fuse/relay box in the engine compartment and set it aside. Disconnect the electrical connector for the fluid level sensor and use a syringe to extract as much fluid as possible from the reservoir. Place rags under the fluid fittings and prepare caps or plastic bags to cover the ends of the lines after disconnection, taking care to avoid spilling brake fluid, which can damage paint. Use a flare nut wrench to loosen the fittings at the ends of the brake lines where they enter the brake master cylinder, then pull the brake lines slightly away and plug the ends. Remove the brake master cylinder mounting nuts and carefully pull the brake master cylinder off the studs, ensuring no fluid spills. If installing a new brake master cylinder, transfer the reservoir from the old one, using new seals as needed. Before installation, bench bleed the new brake master cylinder by clamping it in a vise and attaching bleeder tubes to the outlet ports, filling the reservoir with the recommended brake fluid. Slowly push the pistons into the brake master cylinder to expel air, repeating until no bubbles are present. After removing the bleed tubes, install plugs in the open ports and the reservoir cap. Install a new rod seal onto the brake master cylinder, applying silicone grease, and then mount the brake master cylinder over the studs on the power brake booster, tightening the nuts only finger tight initially. For older models, measure the distance from the piston pocket to the end of the brake master cylinder on both the old and new units. Thread the brake line fittings into the brake master cylinder, ensuring they are tightened without stripping the threads. Fully tighten the mounting nuts and brake line fittings, then fill the reservoir with fluid and bleed the brake master cylinder and brake system by having an assistant depress the brake pedal while loosening the fittings to allow air and fluid to escape. After completing the bleeding procedure, rinse the area under the brake master cylinder with clean water to prevent damage from brake fluid. Finally, the remainder of the installation follows the reverse order of removal, and it is crucial to test the operation of the brake system before returning the vehicle to normal service.