Mercury 5M6Z-2140-B Cylinder Assembly - Master

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The master cylinder is installed over the studs on the power brake booster, with the attaching nuts tightened only finger tight. A new O-ring is installed into the sleeve of the master cylinder, and the brake line fittings are threaded into the master cylinder, with the fittings tightened to avoid stripping the threads.

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.