Mopar 4721550AD Brake Master Cylinder

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.

Reinstall the lines, hand-tighten the flare nuts carefully to avoid cross-threading, and then securely tighten them with a flare-nut wrench. Complete the process by filling the master cylinder reservoir and bleeding the brakes to ensure proper brake function.