Hey Abdul I am also getting this noise. Could you please post photographs of your brake booster from inside. I mean take the photo of your brake paddle from inner side. You will see the linkege connected to brake booster. On the linkage you will get small holes with gause. The holes and its gause should be clean & colour should be white. If there are oil stains then I fear that there is minor leakage in brake booster from inner side. So there is hissing noise of vaccum leak & oil stains on the gause of brake booster from inner side. I am going to visit TATA . I will compare with other cars then update it.