Hissing sound from brake servo pipe area

[kevin316i]

I only noticed this today, but is it normal to hear a hissing sound around the brake servo? Sorry if I seem to be asking stupid questions, but I had a 316i for 9 years and am just new to 318iS ownership.

Thanks,
Kevin.

[Dan318-is]

welcome to is ownership!

i too get the hissing sound when the car is static an i press it, im not sure if it still does it when its running as it gets vacuum from inlet manifold, plus all i can hear is the engine, but im pretty sure its normal pal

hope this helps

[kevin316i]

Thanks for the feedback. The car has a lean misfire problem, so I'm looking for anything out of the ordinary that could be contributing to the problem.

[Dan318-is]

hmm i doubt it woudl be that, but im n genius!

let me no how u get on pal

[Brianmoooore]

Shouldn't hiss all the time. Might well be your air leak.