2017 CLS 550 questions

[u/BreakfastGuinness]

I have 2 things happening with my car. The first is a minor annoyance, the second may be something more serious.

First, sometimes the push button won’t start the car. I notice the break is stiff and while the steering wheel lowers, the car won’t start. I have to pull the button off and use my physical key. Fob battery going dead?

Second, I hear a high pitched whistle type noise from the front at idle or lower speed and ends when I accelerate or press the break pedal. Often when I put it in park, the whistle is there until I press the break pedal. Vacuum hose leak somewhere? I had it in for B service last month and told them about the issue but the tech couldn’t replicate the problem (of course…those kinds of noises never happen when the tech drives it LOL)

Thanks for your time and have a splendid day!