93 ATX...Hissing sound when in PARK

[benjammin]

Constant hissing when its in PARK, goes away when I shift to any other gear.
Any suggestions?

 

[Vnuk1]

CLICKY!

 

[Mr Anonymous]

It's the vacuum venting from the valve at the shifter that controls the automatic parking brake release. Once you move the shifter out of park it applies vacuum to the release valve at the parking brake. When it's put in park it removes vacuum so the parking brake will stay engaged and vents to atmosphere.

 

[benjammin]

thanks for the info