Strange Clutch Noise When Depressed

[Jdwagner888]

So after giving the car a bit of boost one time the clutch started making a noise (but only when pushed down) It sounds like air is leaking out of a hose as soon as i begin to depress the pedal and then continues the entire time the pedal is pushed down. When the clutch is fully engaged it makes no noise and works as advertised. Any info on to what this might be?

[89CAL]

Throwout bearing? Hard to say without hearing it

[Jdwagner888]

Throwout bearing? Hard to say without hearing it

The sound is coming out of here.

http://youtu.be/olbM8b23vBI

Edited January 19, 2014 by Jdwagner888

[colourclassic]

If it is a very faint 'wooshing' sound, it is most likely the pilot bearing, which is normal.

[Borci88]

You're clutch booster is leaking. That's why you can hear an air sound coming from the clutch pedal.

[Jdwagner888]

Is this something that I can fix easily? or require2 a full replacement

Also is it safe to drive with it like this for now?

Edited January 19, 2014 by Jdwagner888

[tricstar]

Could be vac line to clutch master cylinder has popped off or split, <br />Mine has done it a few times when launching. Have you noticed it idleing higher? <br />Anyway have look in the engine bay at the clutch master on the fire wall behind the intake manifold and see if there is a vacuum line not connected. <br />

[Borci88]

If that was the case Richard it would be making the noise all the time. I definitely believe it's the booster as I have replaced these a couple of times, especially on 32R's. It's a full replacement job as I'm not sure if they can be rebuilt, $200+ I think for the part. Not the easiest job, you have to unbolt the brake booster and push that forward as far as it will go, so that you can wiggle the clutch booster out.

And yes it should be safe to drive, have you noticed a slightly higher idle than usual? Or a heavier clutch pedal?

[Jdwagner888]

clutch pedal is a bit heavier. I also noticed when i push the clutch the idle goes down a small bit and boost gauge shows a small increase. I have a full shop with lifts available to replace this. would it be easier to get to from the bottom of the car or is it easier to remove from the inside of the car? Thanks everyone for the help.

[GTRPSI]

100% the clutch booster, we have had this happen twice to us, the diaphram inside splits and gets a leak.

[Borci88]

Jeff, the booster is obviously behind the clutch master in the engine bay, first you must remove the 4 nuts holding the brake booster in in the footwell. Then you remove the 2 nuts holding the clutch booster on. IIRC you have to remove the pins from one or both pedals as well so they can be pushed out as much as possible. From there you remove the vac line on the booster and then remove the master from the booster. From there it should be fairly straight forward on how to remove and replace. The new booster should come with a rod for inside, if you're going to use the new one make sure you check that its the same length as the rod in the original booster. Good luck.

[Jdwagner888]

Thanks for the help!