how do i remove the master cylinder on a 1998 jeep wrangler?

Answer 1

remove the brake lines going to the master. Then remove the bolts that hold the master in place on the booster. With the new master, put it in a vice, add brake fluid, remove the plastic caps and let the gravity bleed the system until fluid runs from the ports. You can puch from the rear of the cylinder to force the fluid out, but then you would have to hold the piston in and place your fingers over the ports before you let go of the piston on the rear of the cylinder. Do this until fluid drips freely. then install the master on the booster without the lines yet. Have someone go inside the car and slowly push down on the brake pedal, once they go all the way to the floor, DO NOT LET THE PEDAL MOVE BACK UP! this will allow air in the system. So when the pedal is on the floor, you go and install the 2 lines back onto the master. One the 2 lines are both on and tight, have your partner release the pedal back up. What this does is pull the air out of the lines and into the master. Top off the master til full, put the cover back on and your done. Test the pedal. If the pedal is spongy , then you allowed air into the system and you need to bleed it. But that is for another question if you need it.
Good luck...Ron