Hello again, this week it's my brakes that are causing me grief... When I step on the brakes they feel a bit spongy, the brakes aren't as strong as usual, and the brake warning light comes on. When I let up on the brakes the light stays on, then after stepping on the brakes again it's spongy again but then the light goes out and the brakes work normally again. The fluid reservoir is full in both chambers and there are no leaks anywhere on the truck anywhere. What can the problem be? I need help fast, I can't drive this thing like this!

 

Sounds like either the master or the RWAL dump valve. The master's cheaper, so swap that first.