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How did cleaning the plunger work for the delayed shut off issue? Mine did the same thing, 10 seconds or so but only once. It's been fine since but may need a cleaning. When I toggle the switch on and off I hear the mechanism moving....

Thanks guys. I have wrapped the cadillac valve and that got rid of most of the hissing. Now that I am aware that the brake booster is connected that all makes sense! Cheers,

Thanks papakb. I have read up about the hissing from the Cadillac valves, but I thought it was strange that the hissing was being affected by the brake pedal. Makes sense now as a hydro boost connected to power steering! I've owned my hmmwv for about a month and I failed to realize there was no...

Hi All. I am new to the group so I hope this new post is appropriate. I have tried reading through various historical post about hissing sounds related to brake boosters and the Cadillac valve for the hmmwv but my particular issue has something that is puzzling me. Basically, I'm getting a...