TC510 clutch problem with hydraulics - Magura

[Kutis]

Hi there

I searched the forum but I couldn't find my answer. OK my clutch (magura) went weak so my first thought was air in the system. After endless bleeding I started to go into more details.

I tried to bleed the system bottom to top with no luck.

I decided to take it apart master cylinder, hose, slave cylinder to check for any problems.

I wanted to test master cylinder by disconnecting hose and see if fluid is squirting from the connection... result nothing.. It pushes air out and creating vacuum when coming back but it's totally dry inside. Obviously with full reservoir.

The piston is moving all the way and I can see a small gap where liquid should flow in but nothing is coming from the other end.

Now do I have the wrong end of the stick or I need a new master cylinder kit? Should the fluid be floating out when disconnected?

Thanks guys for response.

 

[ken510]

If you have it put back together, try bleeding it again. Get a syringe, some carb tube and push the fluid in from the bottom slowly. Every once in a while, pull back on the syringe. This will get those bubbles that could be down in the slave. Use a smaller syringe to take fluid out of the top master cylinder as it fills. If you find the slave is leaking you could order a new piston and ring from 7602 and make sure you check the slave barrel for scuff marks. If you have to replace the cylinder, go with the stock set up. When you re-install the slave, fill it up with fluid and slowly pump the piston to get the air out, then connect the line to it and bleed. Hope this helps and good luck.

 

[Kutis]

Thanks for response.

I got new master cylinder kit from Husky Sport UK which they delivered next day and it started pump fluid. A bit fiddly job but got there eventually. I thinks this was the reason of my clutch problem. My old cylinder didn't look bad with no marks of damage and even the seals look OK but even a small change of shape can make such difference...

I "invented" slightly different technique to bleed the clutch... The reason was I had too small syringe which struggled to push all the fluid from the bottom to the top, so I had to find another way..

I. I disconnected the hose from the master cylinder and the slave one.
II. I filled up the slave cylinder right to the top and I also checked pumping some fluid into the top end of the hose and checking for leaks etc.
III. I connected the hose with the slave cylinder at the bottom and loosen up the bleeding nipple.
IV. With my little syringe I pumped fluid into the hose until I got a constant flow from the bleed nipple. This way I assumed there isn't any air in the hose and slave cylinder.
V. I connected the hose with master cylinder and pumped the rest of the air trapped between the hose and master cylinder. It's right next to the master cylinder so you get some bubbles out in the fluid reservoir and you should start to get pressure back in your clutch lever.

I had couple problems in the past and I know can be pain in the arse if they don't work .. pumping for hours with no luck.

I hope this helps guys.