Q: How to replace wheel cylinders in a Mercury Mariner?
A: If replacement is indicated (usually because of fluid leakage or sticky operation), it is recommended that the wheel cylinders be replaced, not overhauled. Always replace the wheel cylinders in pairs - never replace just one of them. Raise the rear of the vehicle and support it securely on jackstands. Block the front wheels to keep the vehicle from rolling. Remove the Brake Shoe assembly. Remove all dirt and foreign material from around the wheel cylinder. Disconnect the Brake Line. Don't pull the brake line away from the wheel cylinder. Remove the wheel cylinder mounting bolts. Detach the wheel cylinder from the brake backing plate and immediately plug the brake line to prevent fluid loss and contamination. Place the wheel cylinder in position and install the bolts finger tight. Connect the brake line to the cylinder, being careful not to cross thread the fitting. Tighten the wheel cylinder mounting bolts. Now tighten the brake line filling securely. Install the brake shoe assembly. Bleed the brakes. Check the operation of the brakes carefully before driving the vehicle.