Nissan 46010-3L120 Cylinder Assy-Brake Master

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To remove the Brake Master Cylinder, first disconnect the cable from the negative battery terminal and unplug the electrical connector for the fluid level warning switch. Use a syringe to extract as much fluid as possible from the reservoir, placing rags under the fittings and preparing caps or plastic bags to cover the ends of the lines once disconnected, taking care to avoid spilling brake fluid, which can damage paint. Loosen the fittings at the ends of the brake lines where they enter the Brake Master Cylinder using a flare-nut wrench to prevent rounding off the flats. Pull the brake lines away from the Brake Master Cylinder and plug the ends to prevent contamination. Remove the nuts attaching the Brake Master Cylinder to the power booster and carefully pull the Brake Master Cylinder off the studs, discarding the old gasket between the Brake Master Cylinder and the power brake booster. For installation, place the Brake Master Cylinder over the studs on the power brake booster and tighten the nuts only finger-tight, ensuring a new gasket is used. Thread the brake line fittings into the Brake Master Cylinder, adjusting the position slightly for easier threading while avoiding stripping the threads. Securely tighten the mounting nuts and brake line fittings to the specified torque. Fill the Brake Master Cylinder reservoir with fluid, then bleed the lines at the Brake Master Cylinder by having an assistant depress the brake pedal and hold it down while loosening the fitting to allow air and fluid to escape. Tighten the fitting and allow the assistant to return the pedal to its rest position, repeating this process on both fittings until the fluid is free of air bubbles, followed by bleeding the remainder of the brake system. Finally, check the operation of the brake system carefully before driving the vehicle.