Well Thanks to Gerald's ideas and encouragement and Joel's encouragement and sending me the wiring diagram for the exhaust brake circuit I was able to get the pac brake moving and working properly again.
Gerald suggested disconnecting the linkage from the air cylinder and seeing if the butterfly valve moved. I took the e-clip off the top of the pin and tried to push it down, no joy. I had to get a drift pin and a good sized hammer. It finally started to move, added more oil. drove the pin down until it bottomed out on the bracket. There was not enough clearance to get it all the way out. But now I was able to move the linkage a little, this must be the pivot that was seized up. I was able to wedge a screwdriver under the pin and work it up some, more oil. I used a bigger screwdriver and was able to get the pin all the way back up. I was able to work the linkage about half way a few times. I decided to put the e-clip back on being careful not to have it spring off. Of course it did fly off into the engine. I went and got my magnet tool and looked under the coach. It was not there. I went back up in the coach and said a prayer and the first place I looked I saw the clip laying. Extended the magnet and got it. Finally got it installed.
Then I got out Joel's wiring diagrams. They showed K9 in the front electrical bay wire #204 feeding the exhaust air solenoid. Found it easily. I made a jumper up with a fuse in it. Pulled wire 204 off the relay and verified that it said exhaust solenoid, jumped it to 12V and I could hear the valve actuate. I moved the jumper to 12V that was controlled by the ignition. I went in and turned the ignition on and checked to make sure sure the valve opened all the way. I cycled it a few times and made sure it also closed all the way. All looked good. I removed the jumpers and picked up the tools. Closed up the hatches and pulled in the slides, time for a test drive.
We live halfway down a hill so I fired up the Cat and headed down the hill. The pac brake worked as designed. I pulled into the salt barn and turned around. Now for the real test down the big hill on the other side of the road. Up past the house and down the big hill. I started down the hill at 35 and max speed I reached was 38, great job of holding back the coach. The other day I had to use a lot of brake to stay at 40 going down this hill. Went all the way to the town garage and turned around in the big lot up there. The brake seems to be working as it should. Since I use it all the time it should continue to give me good service.
Thanks to all who commented or sent me emails.
PS I called Monaco Parts and was able to order all the wiring diagrams for my coach. $50 plus shipping.
