hissing sound from gas pedal

[sparkles99]

Hi!! Just wondering if anyone has this experience. I recently got a aircon evaporator replaced at BMW. they had to remove the dash board and all to complete the job. after getting back my car, now, i face an issue where there is a hissing sound when i step on the gas pedal. the hissing sound seems like it comes from the gas pedal. sounds like a lose hydraulic cable? im not sure. they have tried to rectified it but dont seem to be able to find the problem. the hissing sound appears only when i step heavily on the gas pedal. do you have any idea what the issue might be?
It sounds like air is escaping but it doesnt sound like its coming from the engine. pretty much from the gas pedal.

 

[rssid]

You can pull the gas pedal out with basic hand tools. Its just an electric switch theres no cables connecting except for electrical wires. Otherwise just bring it back to PML let them sort it out if its under warranty