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I assume you are talking about the brake master cylinder. MASTER CYLINDER REMOVAL (1) Disconnect primary and secondary brake tubes from master cylinder. Install plugs in the outlets of master cylinder. (Caution: Use a line wrench to avoid damage to line nuts) (2) Remove nuts that attach master cylinder to power brake unit. (3) Slide master cylinder straight out away from power brake unit. RESERVOIR REPLACEMENT Before disassembling the master cylinder clean outside of reservoir and master cylinder housing. (1) Remove reservoir caps and empty the brake fluid from reservoir. (2) Position master cylinder in a vise. Grasp reservoir and firmly rock from side to side to remove from master cylinder housing. (3) Remove and discard master cylinder housing to reservoir grommets. (4) Install new housing to reservoir grommets into master cylinder housing. (5) Lubricate reservoir mounting area with clean brake fluid. Place reservoir in position over grommets and using a rocking motion, seat reservoir properly onto master cylinder housing. CAUTION: Be sure that reservoir is positioned properly! All lettering should be properly read from the left side of the master cylinder. Be sure reservoir seats all the way down until the bottom of the reservoir touches the top of the grommet. BLEEDING MASTER CYLINDER Before installing the master cylinder on vehicle, it must be bled on the bench as follows: (1) Clamp master cylinder in a vise and attach bleeding tubes. (A kit can be purchased at any auto parts store). (2) Fill both reservoirs with approved brake fluid. (3) Using a brass rod or wood dowel depress push rod slowly and allow the pistons to return under pressure of springs. Do this several times until all air bubbles are expelled. (4) Remove bleeding tubes from cylinder, plug outlets to prevent spillage and install caps. (5) Remove from vise and install master cylinder on vehicle. INSTALLING MASTER CYLINDER (1) Position master cylinder over studs of power brake unit, aligning power brake push rod with master cylinder piston. (2) Install and tighten attaching nuts. (3) Connect front and rear brake tubes and tighten. (Do not over tighten) (4) Bleed brakes using normal procedure, being sure fluid level in master cylinder is maintained. Bleed in this sequence. RR-LR-RF-LF

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Q: How do you replace the master cylinder located on a 1986 Honda Civic DX?
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