Hissing brake sound on '09

[s_c5519]

Originally Posted by twr

hi my 08 doesn't make any noise inside when you hit the brakes. If you push the brake pedal with your hand with your head down there still no hissing noise. This only happens when you hit the brake?

Hi yes only with the brake. It just can't be normal, I will bring it somewhere else. Thank you for your replies.

[s_c5519]

ok, looks like I have the answer?... I called the service dept at Legends Hummer in AZ and he said the hissing is normal and comes behind the firewall... The '09's no longer have the hydro booster that connects into the brake system. It is upposed to be a better setup. The ones ('08 and under)with the hydro booster would leak and make whining noise when turning...

Sound right? any brake experts here?

[Saudi H2]

I have the same sound on my H2 sut 2009

When the brakes get warmer the kinda go away !