Mopar 4721154AB Brake Mastr Cylinder

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To remove the master cylinder, start by pumping the brake pedal with the engine off to relieve the vacuum inside the power brake booster, preventing contaminants from entering it. Remove the battery and use a syringe to siphon the brake fluid from the master cylinder reservoir. Place rags under the fluid fittings and prepare to cap or bag the line ends when disconnected. Loosen the line fittings with a flare-nut wrench, move the lines slightly, and quickly plug the ends. Thoroughly clean the mounting area, remove the nuts attaching the master cylinder to the power booster, and carefully pull it off. If necessary, transfer roll pins from the old reservoir to the new master cylinder, ensuring new seals are installed between the master cylinder and reservoir.

To remove the master cylinder, start by pumping the brake pedal with the engine off to relieve the vacuum inside the power brake booster, preventing contaminants from entering it. Remove the battery and use a syringe to siphon the brake fluid from the master cylinder reservoir. Place rags under the fluid fittings and prepare to cap or bag the line ends when disconnected. Loosen the line fittings with a flare-nut wrench, move the lines slightly, and quickly plug the ends. Thoroughly clean the mounting area, remove the nuts attaching the master cylinder to the power booster, and carefully pull it off. If necessary, transfer roll pins from the old reservoir to the new master cylinder, ensuring new seals are installed between the master cylinder and reservoir.

To transfer the plastic fluid reservoir, drain it, place the aluminum part of the new master cylinder in a vise, and gently pull the reservoir off while rocking it back and forth by hand. Replace the rubber grommets with new ones, insert them into the master cylinder, lubricate them with clean brake fluid, and press the reservoir back into place with a rocking motion, ensuring it touches the top of each grommet.