Another "brake help" thread...

AJ/FormS Just a few minutes this morning to diagnose but found the brake light wasn't working. I spent some time to get it working then disconnected the parking brake wire from the switch to remove that variable; I don't have an intermediate cable anyway so the pedal isn't doing anything but triggering a light. Once the light was working I found that an initial hit to the brake pedal, regardless of the pressure I use, turns the light on. The second hit turns it off and the pedal starts to firm up. If I understand correctly, initially I have low pressure to the front brakes, the shuttle valve moves and sticks, probably blocking fluid to the front brakes, then resetting after I hit the pedal again, everytime. I'm open to your thoughts, but it seems like I have to replace the c-valve, prior to moving forward. In my mind, I clamp the caliper pistons and wheel cylinders, but keep getting a stuck shuttle valve on the initial hit, I'm going to struggle getting the system straightened out. Let me know your thoughts on next steps given what I've found so far. Thanks!