'85 gl1200 aspencade front brake issue

[ptrumblejr]

my 85 apencade keeps locking up on the front caliper that's actuated with the front master cylinder. even when it's parked and not used for weeks i have to release the bleeder for it let go. is this the brake line or the return on the master cylinder?

[the_big_h]

Almost certainly the problem is in the master cylinder - the bleed hole is blocked.
There are 2 holes in the bottom of the reservoir that go into the master cylinder bore. A bigger one that often has a small metal deflector plate clipped over it, and a tiny one. The tiny one is blocked.
It is possible to just push a small wire (I use a wire pulled from a wire brush) into it to clear it, but that's probably a temporary fix - you are only pushing the blockage into the bore, it will probably eventually come back to block the hole again.
The guaranteed long-term fix is to rebuild the master cylinder, and flush the brake system.

[ptrumblejr]

i did exactly that and does seem to have helped. the real proof will be in the next few days to see if it locks up again. thanks for help