My solution to the 3 that I had was to pull them out of my airplanes and give them to my good friend John with a ( warning ) use at your own risk, I HAD IT WITH THESE BVM BRAKE VALVES, they work and they don't work even with the best maintenance I could give them and I do maintain my stuff, so now I use a mini air valve with a servo arm on top actuating it and lube on the brakes, guest what, they work all the time every time.

PS: My first and second Fei Bao Hawk have the mini air valve for brakes, very happy with this bullet poof set up.