auxiliary brake prob

[RoyalTree]

I saw a question on the topic somewhere but it didnt have a answer so i figured I would try to see what all the experienced minds in here have to say on the subject.

My auxiliary brake sensor goes on and off once in a while, usualy as the truck is just turned on. Many times in goes off in about 30 seconds, lately it stays on longer. Could somebody give me a idiots guide to the auxiliary brake?

btw, the truck is a 97 gmc 7500 with a cat 3116

 

[RoyalTree]

ok so since yesterday the alarm stays on at all time. If somebody could explain the whole aux brake to me i would really appreciate it. thanks. Would like to have prob fixed by monday to get back to work.

 

[RoyalTree]

any info anybody has would be greatly appreciated...thanks