Quote:
Originally Posted by NC67Chev
Trying to put the finishing touches on disc brake conversion today. I'm trying to get the brakes gravity bled, but I can't get any fluid to move at all with the bleeders wide open. I've seen something referring to this button on the front of the prop valve. Do I have to do something with it while I'm gravity bleeding?
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On the type of prop /combination valve you have, depressing and holding the button nearest the front brake line should allow your brakes to bleed. There is a piston inside your valve that probably needs to be re-centered. If depressing and holding the front button does not work then it gets a bit more complicated. The piston can be centered by removing the 9/16 in rear cap and pressing the piston all of the way forward. Remove the plastic brake switch contact and use a pick to center the V slot in the piston in the center of the switch port. Re-insert the switch. If it reads "open" with a circuit tester or infinite resistance with an ohm meter it is in the correct location and your brakes will gravity bleed. At this point I usually insert a "centering tool" which holds that piston immobile while you continue bleeding. Performance On Line has one for $ 7.00. It screws into the warning switch port. Be sure to replace the warning switch when you are finished. Good luck