Reply to "Brake Warning Light"

..... and if Larrys brutal-stomp still doesn't work, its possible to pull one brake line off the valve and shoot a SMALL amount of high pressure air in one side from a compressor. This WILL move the shuttle. It helps if the shuttle valve light switch is out; the shuttle o-rings if in good condition will keep most or all the brake fluid from leaking. Obviously, this also does nothing for removing the crud that caused the problem.
To figure out which direction the shuttle is stuck in so you know which line to disconnect, pull the light switch out and use a mirror to figure out where the shuttle is located, referring to Larry's exploded view.
All this is why my valve has been on a shelf in the shop for 20 years. I reaaly don't need an idiot light to tell me to check my brake fluid levels and pad thicknesses....
On other cars, the movable shuttle has return springs on both ends to sort of help it recenter. In our valve, all we have is the slope machined on the shuttle and the spring in the light switch. If varnish etc gets in there, that little spring's not enough to recenter the shuttle.