Mercury 6L8Z-2140-B Kit - Master Cylinder Repair

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The master cylinder is removed by first extracting as much fluid as possible from the reservoir using a syringe. Then, rags are placed underneath and caps or bags are prepped to cover the brake lines once disconnected. The fittings at the ends of the brake lines are loosened, and the brake lines are pulled slightly away from the master cylinder and plugged to avoid contamination. The electrical connector at the brake fluid level switch is disconnected, and the nuts attaching the master cylinder to the power booster are removed. Finally, the master cylinder is carefully pulled off the studs and out of the engine compartment.

The new master cylinder is bled by mounting it in a vise and attaching bleeder tubes to the outlet ports. The reservoir is filled with recommended brake fluid, and the pistons are slowly pushed into the master cylinder using a large Phillips screwdriver until no more air bubbles are present. The bleed tubes are then removed, and plugs are installed in the open ports to prevent fluid leakage and air intake.