Bleeding Clutch...

aardvark · Jun 20, 2010

Have noticed that the pressure at the clutch lever has been feeling a bit light of late, so decided it was time to bleed the clutch. The service manual makes it sound easy.

Got myself a syringe and a length of tube.
Took the rubber cap off of the nipple on the slave cylinder.
Took the master cylinder cover off.
Hooked the tube up to the nipple.
Cracked the nipple open with an 8mm spanner and pushed the fluid out of the syringe.

It did not appear that any oil was being added at the master cylinder end. As far as I could see, the only thing that happened was the slave cylinder filled up and oil weeped down the side of it.

Are there any tricks? Do I need to pump the lever?

Taffy · Jun 20, 2010

is your clutch lever touching the inside of a bark buster or some such? if so the lever needs to be free to open out 100%. they can play tricks and the seal goes just like that and for no good reason.

regards

Taffy

aardvark · Jun 21, 2010

Taffy said:
is your clutch lever touching the inside of a bark buster or some such?

Nah mate. I recently lost the handlebar insert from my Bark Busters so have had to take them off for now.

Oh, and by the way, it's an '04 FE450E.

Bofwool · Jun 21, 2010

Crack the nipple open more. Hang a bucket with a handle on the handlebars and pop open the clutch reservoir. Overflow it until you are dead certain there are no bubbles in the line. I used Auto Transmission fluid, its red, the Magura stuff is red, what could go wrong?

I have a little oil can that i pump the fluid into the nipple with and a 12 inch length of clear hose so i can see if any bubbles are about to enter the line from the bottom. After i was sure i had flushed it right through with no bubbles i pulled the oil can off the clear line leaving it about half full of fluid on the nipple, pumped the lever and it changed the level of the fluid in the clear hose at the bottom so i knew it was pumping. I then locked the bleed nipple off, put the cover back on and fired the big girl up. Worked a treat. I use the same method with brake fluid for my Brembo's.

One thing that might make a difference is that the nipple was surrounded and saturated with fluid at the threads by the bottom of the clear hose so it would only suck more fluid in there and not air. I have been down that road with brake bleed nipples before and a roll of thread tape!

aardvark · Jun 22, 2010

Thanks Bofwool, followed your instructions and it seems to have worked.

The feel at the lever is ****, pushing it in gear with the lever pulled in is near impossible, but most importantly, when I put it into gear with the engine running and the lever pulled in, it doesn't go anywhere.

Yay!

For info, I used baby oil.

Bleeding Clutch...

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