I just lifted my 86 M1008 and much to my dismay, while finishing up the rear of the truck and getting ready to connect the linkage for the rear proportiong valve I watched as my brother spun the valve to "see if it was free and working" So now armed with no knowledge of where it was originally positioned. I set it where I thought it should go and put everything back together. Well, the brakes haven't been the same since. can anyone tell me how to adjust the valve so I can get my brakes back? The TM tells you to use some type of gauge to set it, buy placing the tang of the gauge in the lower valve mounting hole, then cut the tang off it. Mine doesn't have that on it, cut or not. Is there a generic way to adjust this or am I going to have to go with a trial and error approach?