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Laurence Gibbs
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Everything posted by Laurence Gibbs
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Here is a link to the post you have to look through the post to find the pics. The Original Porsche 996 Carrera Owners Club | Facebook WWW.FACEBOOK.COM Welcome to the best 996 owners group on FB! Do not be fooled by imitations! This group was created by Jason Carter in the UK for new... -
Unfortunately I can't post pictures here . I have a post on the 996 carrera owners Facebook group do a search there for pics. I took the spare clutch master cylinder apart . It's a simple cylinder with a piston very similar to the slave in design. It has what I can best refer to without pictures as a bicycle pump seal . The type that is a wedge shape. Push the piston down the cylinder and the seal expands to seal the cylinder and push fluid at the outlet. Now here is the interesting bit . The piston at full travel reaches a step in the cylinder that stops further movement forward . This leaves the seal sitting against the step in the cylinder . I am at a loss to understand how any further fluid can flow when the seal hits the stop as the seal is splayed out against the stop. Hopefully of you look at the pictures on the FB group you will get the idea more clearly. The inlet side of the master cylinder is part of the plastic body and fluid flows into the cylinder through a small port at the rear of the cylinder all the time the piston returns back from the outlet and there is less pressure on the outlet than the in , fluid will flow past the seal and fill the cylinder . Aa the piston travels back down to the outlet the seal opens and will not let fluid past the seal.
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I have changed the slave which is what started it . So I changed it back ( the original slave was fine when I changed it out as it was being done as part of clutch change) problem still persisted. I then changed the master cylinder thinking maybe that might be it . No change and both master cylinders won't let me bleed the clutch with the pedal down . I have recently changed the flexible line to the slave along with the hard line back to mid way along the car. Will see how that goes . I am just real curious why I can't bleed with the pedal down . This has been over probably a couple of years now . I will bleed it , it lasts a few weeks , bleed again lasts a month , bleed again lasts six months etc . It's ruining my confidence in the car as when I do want to use it , pedal drops . I expect I will have to bite the bullet and go back through with another slave and possibly master cylinder if the new flexi / hard line does not help. There are no signs of leaks and the flexi was corroded but OK when removed. If I can find the old master cylinder I may have it apart and see just how it works for my own piece of mind . Thanks for the replies .
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Loren, if I do this I can't get past step 1 as no fluid will flow ? The only way to get fluid to flow is to bleed with the pedal up ? Is this something to do with how slowly you let the pedal down ? I can't see how that would make a difference , clearly you don't won't it to slam to the floor . But it's simply going from one end of the cylinder to another.
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Bringing this back up. I realise the factory manual says depress the clutch when power bleeding but everytime I try this I get no flow ? If I leave the peddle up I get flow and can bleed . Can someone explain ? I have seen it mentioned that if the peddle is depressed it blocks the port and stops the flow and I have also seen it said (de Mort) that you depress the peddle ? Confusing. I have tried bleeding both with an original master cylinder and a replacement and neither bleed with a power bleeder with the clutch depressed. What am I doing wrong ?