its ok some of the time but getting worse. when I block the air intake off I can hear air been stuck in so I've checked the rubber pipes to the turbo etc and all seem OK
on the right side of the engine is a rounding black cylinder with pipes going to it which seem to be for the brake servo.the noise of air sucking in seems to be in that area is this some thing that fails?

 

Did you carry out any repair or maintenance work on the car before the problems appeared?

 

Bonjour,il arrive que le réservoir d'air dépressurisé ce fissures commun chez BMW 🖐️