all of a sudden last night when i start my car, if you barely (or fully press) on the clutch pedal at all you can hear a little hissing noise...kinda sounding like an air vacuum leak in a sense. after driving the car and getting it warmed up the noise goes away. but also after driving it starts to feel like theres air in the clutch line making the pedal feel somewhat spongey. any suggestions? my friend said that its the throw-out bearing in the clutch making the noise, but that bearing wouldnt be making that feeling in the clutch like theres air in the line i dont think...what do you guys think it is?

 

anyone?

 

I don't know about the noise but if it feels like you have air in the clutch line then you probably do. You could be spraying clutch fluid, and thats making the sound. That can also be the problem of air in the line.
Charles

 

but the noise goes away after driving the car a little bit and getting it warmed up..i havent noticed any fluid being lost.

 

^

 

so you are sure there is no air in the lines ?

 

yea cause its been fine til all of a sudden when this noise started

 

anybody know at all?

 

i had a similar problem...it seems one of the seals in the clutch master cylinder wasn't holding pressure and it would depressurize...it also made a hissing sound and didn't leak fluid...when i replaced the clutch mc my problem went away...

 

but it didnt sound like it was coming from the clutch mc area...but actually closer to the clutch/clutch slave cylinder area

 

you got me on this one. I'm clueless now. You might want to check the mc though, just in case.
Charles

 

so say there wasnt air getting in the lines...just the noise. would it be the throw-out bearing then?

 

It sounds like two separate problems. You’re probably on the right track with a hydraulic problem and a possible release bearing/pilot bearing problem. I would flush & bleed the hydraulics first. Pulling the transmission is a shadetree job on an RX-7.

 

I'm getting the same thing-- except my howl is more high-pitched. Will stop after about a minute of driving. If you stop the car and start it only a few minutes later, it still won't make the noise, but if it starts off cold, it does...

Nothing in the archive on this one... and so far there doesn't seem to be a solution on this one...