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Posted by lefecious
 - April 06, 2023, 02:16:11 AM

Bike had been sitting for years and the clutch lever had no resistance. I thought it was the master cylinder, so I bought a kit and rebuilt it and now I'm trying to refill the lines with brake fluid and bleed it, but it doesn't seem to work.

I attached a piece of clear tubing to the bleeder valve, filled up the reservoir, then I pull the clutch lever in, hold it, then open the bleeder valve for a second, close it again, and release the brake lever. I repeated those steps dozens of times and sometimes a bubble came out, sometimes nothing. But no fluid really ever progressed into the tubing.

My buddy was there and he's bled brakes on a car many times and he was convinced something else it broken because it should have built up pressure by then.

Is there a secret to this?  Do I need to by one of those bleeder vacuum pump things?

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