No the air lock stays, I've left for a week (didn't have the right tools) before bleeding the slave cylinder and it was the same just a quick loosen a partial squeeze on the lever until fluid is seen, tighten bleed nipple, all is back to normal operation.Just one more question the answer to which will likely confuse me more.:surprise:
Does the problem go away if you let the scooter cool or do you still have to bleed at the slave cylinder?
OK...I Googled it. Heck of a hard time figuring out what to search for. Anyway...this is for water. It may or may not apply here. When water is boiled or evaporates it becomes a vapor. . When it condenses there is non-condensable gases present. (air) Don't ask me how what or why. The article was too long for me to read the whole thing. You can if you like. :wink2: Here you go:As expected I'm more confused.
If the brake fluid was boiling from the heat I would expect it to condense when cooled.:?
Another and maybe more likely possibility is that, with the miles on the bike, the bore of the master has worn. It is larger and allowing the piston to **** in the bore. Another possibility along the same lines is the piston is so badly worn that the piston to cylinder clearance is so great it cocks in the bore. Or even a combination of both. Did the piston look scored at all? Piston to cylinder clearance in a master cylinder can be as little as .001 inches. it is difficult for the average backyard mechanic to measure this distance. If you lube the piston and devise a way to pull the piston back you can do a backyard check. With the bore and piston covered with brake fluid. Piston all the way in, cover the outlet port with one finger. Now pull the piston out quickly. It should make a pop noise. If it just comes out easily the piston to bore clearance is probably too lose. (worn) I wonder how many times a guy uses the clutch in 285,000 miles? >Interestingly, or depressingly, if you will, my clutch is starting to display these symptoms, again.
I just rebuilt both master and slave, but admittedly the master felt sticky, like it was trying to hang up, from the get-go. I suspect I overlooked oiling one of the pieces when assembling.
Any news Johno?
There may be a little delay before I get any further, I work away from home during the week. Due to the heavy summer traffic, rode my NT700Va this week and will do again next week, then I'm out of the UK for 3 weeks so may not be able to provide any further input on subject until August, although I will be out and about on the GL over the weekends so may find something new now I know roughly what I am looking for.Any news Johno?