I got a 2018 RAM 2500 and have been chasing this for almost a year.
I have a weird hiss noise coming from under the dash.
If I press the brake, you can hear it go away quickly, and then you can listen to it again.
Same thing with turning the steering wheel.
I’ve changed my hose from the Hydroboost to the pump, hydro boost, and even put in a brand new Mopar pump and did not fix it.
I know people say there’s a Teflon liner in the nose, but when changing it, I didn’t notice any liner plus all the videos I saw with the liner, it was a different hiss that went away when you held the brake, and turned the wheel.
The only hose I didn’t replace was the one from the hydro to the steering box and the actual box itself.
Am I missing something else to look at?
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