F355 Pulating vibration from clutch pedal

Certainly an interesting issue that I have never heard of here before from memory.

Well, I have seen it before where the pedal pulses constantly. Have found warped flywheels and pressure plates in those cases. Etc..etc.

Have never heard of only happening once though, like this. Not that I can remember anyways.

I wonder if you had some crap get in there to cause it happen that one time.

Again, very strange and I cant think of anything else to explain it at the moment.

 

I think it may be best to keep an eye on it yourself man.

If you take to a mechanic to inspect-

1- They will drive it and if they do not fault it.............they will call you and tell you to come and pick it back up.

2- Or they will pull it apart and inspect. If there is no issue, then you just wasted $500-$1000. **depending on what they charge**

And I dont think there is an issue. If it were constant pulsating, well of course there is something wrong.

I'm not convinced. I would drive it and keep an eye on it yourself mate.

I am sure if the problem arises again will be straight onto it and will have it inspected by a professional then.

 

I've thought about this for a bit. I am trying to picture all the parts that come into play once the pedal is pressed and there isn't a simple explanation I can think of. I suppose it I drove it and could better understand what the pulsing felt like, maybe that would help. I am coming back to a partially blocked valve or line if it is in the fluid system.

Have you topped off your brake fluid? When did you change it last and did you bleed the brakes and clutch system?

Mechanically, that's something else. Uneven fly wheel surface maybe but that would feel more like thumping that pulsing, I would think. I wonder if one of those finger springs is giving out on the clutch disc. Maybe it's something so simple as one of the tie-downs for the hydraulic lines is loose or missing so that the line itself vibrates. I guess I would start looking the system over for anything abnormal on a cursury exterior inspection.

Let us know what you see. This is not an issue we have seen so it has to be something unique to your car and not a known failure.

 

You may have had a piece of clutch lining material break off the clutch disc and momentarily get caught between the disc and the pressure plate.

Did the clutch feel like it was "dragging" at any point?

 

Squeaking clutch is often the noise that precedes the clutch throw out bearing housing cracking and failing (I and a few others have experienced this). I am unsure if that is at all related to the pulsing you felt in the pedal, that may be the slave cylinder acting up? Sounds like you should have this looked at by an experienced technician.

 

I even hate to bring this up I remember seeing this years ago on old big block camaro with an alum flywheel. When she got hot under heavy use it would shutter like your describing. It was a hairline crack in the flywheel about half way through it.

Lets hope not but I would check it out before it turns into something catastrophic.

 

I like the T/O bearing theory. I'd inspect that-costs nothing to do it yourself, and pretty idiot-proof.

 

You do not need a lift.

Check out these two threads:

http://www.ferrarichat.com/forum/showthread.php?t=296274

http://www.ferrarichat.com/forum/showthread.php?t=296614


As for "no stooges" to assist - I did that job myself (the assistance I received was through FChat only), with ZERO automotive mechanical background...the "stooges" are right here on this board to assist

 

Please keep everyone posted on this, I am quite curious. I hope its nothing big. Ohhhh the drama of having a Ferrari does not end when you park it, does it?

 

Boy if that were the only problem... Keep us posted! Don't forget the 355 has bleeding valves at the main brake cylinder behind the firewall. People tend to forget they are there.

 

Great to hear nothing was found. When was the last time the brake fluid was changed?

 

Cool man, you should change brake fluid every 12 months to 2 yrs as brake fluid is very good at absorbing water. So have it flushed more regulary from now on.

A crack in the pressure plate! My my! Have you seen it yourself?

I have never heard of that one before. Do you/they have any pics of this? Would love to see it.

How are they going to rebuild that if it's cracked? Ernie the Stooge had a new one made for around $120 in LA.

Also what blow off valve?

Good to hear they found "something", as strange as the issue seems. A cracked pressure plate caused the pedal to pulsate once? Odd eh? Would love to see pics of where the crack is if possible mate.

 

Ah, fair enough.

Lol, that sounds more like it! I think they are deaming just quietly.

I didn't realise there was a noise there mate? You didn't mention that before did you?

And it has a different feel from normal also??