Mercury 1W1Z-2140-AA Cylinder Assembly - Master

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Honing the master cylinder bore should be avoided as it may lead to improper fit with the rebuild kit.

To efficiently bleed the system, bench bleed the master cylinder by filling the reservoirs with brake fluid and using threaded plugs in the outlet holes to force air from the cylinder. Stroke the piston assemblies several times for each outlet, ensuring all air is expelled. Refill the reservoirs, install the diaphragm and cap assembly, and proceed with the master cylinder installation in reverse order, followed by brake bleeding.

Before overhauling the master cylinder, it is essential to consider factors such as the availability and cost of a new or factory-rebuilt unit, as well as the availability of a rebuild kit.