Master Cylinder: Reassembly
- Install replacement tube seats by threading a spare brake line tube nut into hole and turning nut in until tube seat bottoms. Do not cock tube seat in hole. Remove nut and check for burrs which may have been loosened by nut.
- Install piston cups on secondary piston, with cup lips facing away from each other. Install seal protector, piston seal, spring retainer and return spring on secondary piston. Install seal so lip faces interior of master cylinder when installed.
- Lubricate cylinder bore with clean brake fluid and install secondary piston assembly. Lubricate primary piston seals and install primary piston assembly in bore. Hold primary piston down in bore and install snap ring in groove in bore.
- Position master cylinder in a vise, attaching bleeder tubes to cylinder, and fill reservoirs with fluid so that ends of tubes are covered. See Fig 1. Tubes attached to disc brake outlet must have residual valve placed on end of tube to prevent fluid from siphoning.
- Stroke piston in bore several times until no air bubbles appear at ends of tubes. Remove bleeding tubes and plug outlets to prevent fluid from draining.
- Install master cylinder cover and new diaphragm. On vehicles with manual brakes, assemble brake pedal push rod through retainer, if used, and push retainer over end of master cylinder. Install rubber boot over push rod.
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