JL Brake Booster Issue

[JTenn]

My wife has a 26 Wrangler Rubicon X with 4600 miles on the clock. Since new, the vacuum leaks off within 2 minutes of shut down. I've tracked the vacuum leak to the brake booster. I have taken it to the dealer, which did not surprise me when they said nothing wrong. All tests show no vacuum loss or codes. I feel certain they are plugged into the obd with the engine running and monitoring the reported electronic vacuum data, which clearly shows vacuum present since the vac pump is running. So I did my own testing between my JT and her JL. I realize they use different boosters but the operation is identical. I disconnected the vacuum union in front of the booster and pulled a vacuum on the booster side. The JT, holds vacuum, the JL does not. I can't get it to even move the gauge. There's clearly a split or non seated diaphragm in the booster. How do I get the service department to understand this without sounding like a know it all prick. Unfortunately most techs lack basic troubleshooting skills and are performing scripted tasks straight out of a book. I made it clear the issue is not during normal operation. The issue is having to stand on a brick pedal (see what i did there) to start the Jeep. The brakes currently work fine but there has to be a pin hole leak in the diaphragm. It's aggravating that I have to wait until a major malfunction to get a warrantied part replaced. Does anyone know if a brake booster is serviceable or are they permanently sealed? My JT has to sit for 3 weeks before the vacuum leaks off enough for the hard brake pedal.

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[Bandit’s Lair]

Go in and tell em straight up where the leak is and to fix it if it’s under warranty. It’s not being a prick, it’s expecting service on a product they sold you. If the service person doesn’t work with you ask for a manager, if the manager has a problem go another step up. They CAN find the problem. They’re just not putting in the work past plugging in a dam computer.

 

[JTenn]

Go in and tell em straight up where the leak is and to fix it if it’s under warranty. It’s not being a prick, it’s expecting service on a product they sold you. If the service person doesn’t work with you ask for a manager, if the manager has a problem go another step up. They CAN find the problem. They’re just not putting in the work past plugging in a dam computer.

I do agree that they owe me the service since that's part of the deal I made when we bought the Jeep. I refuse to go to the purchasing dealers service department though, so i drive over an hour to the one I use. I've actually had really good luck with this service department so far and the service writer I deal with, has been good to deal with. At least it's documented now and I'll do what they said and "monitor" it. I guess my perception of a problem doesn't justify them swapping a part based on my opinion and off the books testing methods. Maybe I'll try to find another service department somewhere.

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