Join Date: Oct 2006
Location: Green Bay, Wisconsin, USA
Make: GL1500 SE
The problem might be the master cylinder. There is a spring that makes the piston return all the way. If there is an issue with that spring the piston won't return and it can block that little hole keeping pressure on the brakes. Other things can cause the issue. Are you sure the pedal is returning to the top. The pedal must move free in it's travel all the way to the top and the spring must be in good shape. See attached.
Might try to ride the bike until the brakes start to drag. Put the bike on the center stand to see if you can rotate ech wheel by hand. If you can't rotate then try to open bleeders. Do you get pressure and the wheels rotate free now? Then you know it is a master cylinder, hydraulic or hanging pedal issue.
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Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.