850 Hydraulic clutch Issue

[manovlov]

Hy volvolugnut,

The good side of this story is that I'm a regular customer from skandix. I thank my contact and his firm to help me to carry things on. And I' have may be not done a mistake. I will extract the part tomorrow and send it back to the shop.

To say the truth, (is it allowed ), for me, mechanics is a therapy, a kind of giant mechanic, my world. Succeeding in a repair is a real victory for me. And I really like this 850, it suits me: strong, square, reliable. I tell myself that everything is not always simple, with the hazards of life.

When I have to make a repair, as I am not a trained mechanic, I always have an apprehension, and once the result is finished and the car is operational, I take a little more courage for the next breakdown !

Thank you for the comments.

This hydraulic clutch will be fixed !

Manov

[volvolugnut]

You have very good attitude for this repair difficulty. You are correct - when you overcome this problem and completed the clutch repair, you will gain confidence in your abilities. Then you can try more difficult repairs next time.

Could you post a photo of the slave cylinder when you get it removed?
volvolugnut

[manovlov]

More I learn, more I will be able to help the others.

I will post some pics after the disassembly.

Manov

[manovlov]

So, here is the part sended by Skandix.

I've used the way shown in the video just above to bleed the system.I don't understand how a small pressure of oil can has been able to push out the seal so far. The first bleed was fine, not enough, but fine...

But I may also, as a newbie, have done something wrong. It could help me to have a picture of a Master cylinder 3 outputs reservoir. I precise that the brakes, after the breakdown, were still absolutely hard and fine.Which make me think that the way I've needed the 3 outputs is the right one. The picture is to be sure.

The new part is already ordered.

Manov.

[manovlov]

Hy

The new part is arrived and has been installed. Impossible to bleed all the air in the system. I will have to remove all parts to control hoes, there must be an air I take somewhere.

Manov

[Chuck W]

I think you may have gotten a bad unit, which is why the seal was pushed out.

The only thing the reservoir does is keep the clutch master cylinder supplied with fluid. Mine only has a single nipple on the reservoir to feed the clutch system. It points straight down. Again, as long as the reservoir is full, either should work.

There is more pressure in that system than you think. However, it's possible that the piston was pushed in too far and was able to snag the edge of that seal and help force it out of its seat in the bore.

On the bleeding, I just went through this on the manual swap on my '97 T5. The reverse bleeding procedure worked well enough for me to get the air out of the system. I let it gravity bleed for a short bit (Put a hose on the nipple at the slave cylinder and run it down to a container under the car. This will probably be useful to you, as you are putting in a fresh, empty unit. Once I see a steady stream of fluid in that hose, I close the bleeder and route my hose back up and attached the syringe filled with fluid and open the bleeder and slowly force any air back up into the clutch master, then up to the reservoir.

[manovlov]

Hy Chuck
Thanks for advices. On the pedal cylinder, in the engine bay side, there is a hose that goes to the MC. I may have install it and the hose may have no clamp. After have unbolted the MC, I should reach my goal to be able to control. I also ask myself about the hose I've used, a soft rubber hose.


Manov

[Chuck W]

Not having a clamp on that hose at the reservoir shouldn't have been an issue. There is no pressure in that line, or the reservoir itself. It just gravity-feeds the clutch master.


A clamp out it would mainly be to avoid accidentally knocking it off and losing brake/clutch fluid.

[manovlov]

Thanks for these explanations. What disturbs me is that I pump the pedal with hand, and each time the slave cylinder lets get out no more bubble, each time I start again to pump, the pedal is again soft with lot of air. There is also a noise that sound like when you finish your fast food soda cup with a straw. Air is coming in. But there seems to be no leak at all.

Could it have to matter with the brake booster or the master cylinder itself ?

Manov

[Chuck W]

Don't try and bleed it like that. Put a hose on the bleeder on the slave and open the bleed nipple. Let it gravity bleed (Do not mess with the pedal) a bit into a jar or other container under the car. That will work most of the air out. Close the bleed nipple.
Switch to the reverse pressure bleed with the syringe (you could probably do this from under the car as well). Open the bleed nipple and slowly force the fluid in the syringe into the slave. It will work any air out, back through the master and up to the reservoir.

Pedal bleeding doesn't work well, if at all, on these systems.