ABS - help needed

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There are more ways than one to deal with this, the most aggressive being removing the electronic part and moving the pintels with a strong magnet in order to free it up, that is quite advanced but could be done.

Definitely worth trying the excersize way because of the non-invasive nature of the approach and something i would do first.
Assuming the abs has worked until recently so the stickyness should be minor.

Have you tested the front brake abs activity?

Since the pintels are pushed in position with a spring i would not try to tap the housing in an attempt to loosen them up .

This situation is actually the lesser of a faulty system, someone else reported that the brake actually failed to operate if i remember correctly.

It also seems that Honda's advice to basically flush the fluid and not worry about the abs modulator ( they don't provide instructions as far as i know but i could be wrong here ) is sometimes not sufficient to prevent a situation like yours.

Sorry if i overdo it with the instructions, you seem quite adequately familiar with bikes but it may help someone else if i tell the whole story; cheers