After cleaning, measure the piston to cylinder clearance, use a telescoping gauge and an out side micrometer or a strip type feeler gauge. The cylinder must not be tapered or worn beyond, not corroded, pitted or scored. Replace the master cylinder if the cylinder is not in perfect condition after honing.
Blow all parts dry with compressed air. Blow out parts and check that they are not obstructed lubricates the parts with brake fluid and assembles the unit using manufacture’s instructions. Fig.6.56 shows an exploded view of a typical dual (Tandem) master cylinder. Bench Bleeding a Master Cylinder To install a master cylinder, replace the reservoir cover after bench bleeding. Bolt the master cylinder to the firewall or booster. Check the adjustment of the push rod if a means of adjustment is provided. Without cross threading the fittings, screw the brakes lines in to the master cylinder. Lightly sung the fittings. Then bleed (remove air from) the system.
Tighten the brake line fittings. Fill the reservoir with fluid and check brake pedal feel. Test-drive the car.