Mopar 4721550AD Brake Mastr Cylinder

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To install the new master cylinder, bench bleed it first by mounting it in a vise and attaching bleeder tubes to the outlet ports. Fill the reservoir with recommended brake fluid and slowly push the pistons into the master cylinder to expel air into the reservoir, preventing air from being drawn back in. Remove the bleed tubes, install plugs, and the reservoir cap. Put a new vacuum seal on the master cylinder where it mates with the power booster. Install the master cylinder over the power brake booster studs and finger-tighten the nuts. Thread the brake line fittings into the master cylinder, ensuring they don't strip. Fully tighten the mounting nuts and brake line fittings. Fill the reservoir with fluid, then bleed the master cylinder and brake system with an assistant. Loosen the fittings, allowing air and fluid to escape, and repeat this on both fittings until the fluid is clear of air bubbles. Use rags to catch spilled brake fluid to avoid damaging painted surfaces. After bleeding, rinse the area under the master cylinder with clean water. Finally, test the brake system's operation carefully before normal vehicle use.

To install the new master cylinder, bench bleed it first by mounting it in a vise and attaching bleeder tubes to the outlet ports. Fill the reservoir with recommended brake fluid and slowly push the pistons into the master cylinder to expel air into the reservoir, preventing air from being drawn back in. Remove the bleed tubes, install plugs, and the reservoir cap. Put a new vacuum seal on the master cylinder where it mates with the power booster. Install the master cylinder over the power brake booster studs and finger-tighten the nuts. Thread the brake line fittings into the master cylinder, ensuring they don't strip. Fully tighten the mounting nuts and brake line fittings. Fill the reservoir with fluid, then bleed the master cylinder and brake system with an assistant. Loosen the fittings, allowing air and fluid to escape, and repeat this on both fittings until the fluid is clear of air bubbles. Use rags to catch spilled brake fluid to avoid damaging painted surfaces. After bleeding, rinse the area under the master cylinder with clean water. Finally, test the brake system's operation carefully before normal vehicle use.

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.