Couple of weird things on my A3????

[lifeboatcrew]

Hi guys, anyone got a hissing noise from their brake pedal?? iv got on mine but when i apply the brake it goes away, and was sitting at a set of traffic lights today and the revs of the car went up to 1000rpm all but its self, has happened a couple times now. Any one any ideas???? thanks in advance!

 

[chrissy1502002]

I have the exact same noise atm, I am guessing its a slight leak from the brake servo vacum?