Other Fuel System Tank Mounting problems of the 2010 BMW 535

My BMW 2010 5 series gt ( campaign 10v446000 ) has had issues pertaining too a check valve of the break vacuum pump that leaks a small amount of lubricating oil. Over time this has contaminated my brake booster, and also there has been issues with the power assit braking performance that has led too loss of power assist braking which I've done research and that could potentially increase a risk of an accident. My fuel guage has also displayed a larger amount of fuel than was actually in the tank, which could also increase my vehicle too stall and increase a chance of me being in a accident.