One the end of the combination valve there is a plastic plug/bolt facing the front. Carefully unbolt it and remove the end. You may need a needle nose to pull the plunger out if it doesn't slide out. Take the plunger and pop the plastic bushing off the end and replace it all.
1-remove end cap from front of prop valve. Use a 3/4" wrench to hold valve and a 13/16" to remove cap.
2-Spring will come out with cap, remove plunger with pliers.
3-Use a pick to remove o-ring from about 1" inside of prop valve cylinder.
4-Reinstall plunger, spring and cap.
5-Bleed brakes and your done.
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