hmm...is very easy to discribe... you watch fast and furious?? the orange supra... when racing with black mustang almost ending of the movie....thats the sound like.....
If you are in 0.7 bar and above, you will get a very loud and clear sound of it...normally people wouldnt get this coz the price of it is more expensive than SARD "duck mouth" type...
foot brake pedal suddenly feel loose (kosong) and need to pump once to brake.. usually happen while driving and sometimes while stop at trafic light.. i heard this prob already and common for early...