Hello all, This is my first post - been a long time follower though. I have a 1990 suburban with the 5.7 and the th400. The cruise control suddenly stopped working completely the other day. I replaced the stalk switch because it looked worn out anyways and was the easiest/cheapest to replace. But no luck. I don't think the servo would suddenly stop working altogether - though I could be wrong. I've verified that there is vacuum in the reservoir and the check valve works. When looking around under the dash, I noticed that there are two brake pedal activated switches. Are the brake light and cruise control switches separate? Would functioning brake lights mean that the switch is working? Is there a chance that the switch is stuck open releasing all the vacuum? Thanks for any help.