GMC 18047531 CYLINDER KIT

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Inspect the cylinder bore for corrosion and damage, and replace if necessary. Lubricate and press the new reservoir grommets into the body, and press the master cylinder body onto the reservoir. Remove the old seals from the secondary piston assembly and install the new ones. Attach the spring retainer and lubricate the cylinder bore. Install the spring and secondary piston assembly, followed by the primary piston assembly and lock-ring. Inspect the reservoir cover and diaphragm, replacing if damaged. Insert threaded plugs into the cylinder outlet holes and fill with brake fluid. Loosen one plug at a time and push the piston assembly to force air out. Stroke the piston multiple times for each outlet to expel all air. Refill the reservoirs and install the diaphragm and cover assembly.

Inspect the cylinder bore for corrosion and damage, and replace if necessary.