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I finally got my junk out for a spin tonight and the line lock seems to have failed. I can hear the solenoid activate when I press the button but she won't hold the binders on. Its a hurst unit.

Any ideas as to what's happening?

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Is the one you have servicable? (can you take it apart and inspect the insides) If so take it apart and look for debris in between the seat and the pintle or look for rust on the seat or pintle, it should clean up and hold after that If it is not serviceable you will probally have to buy another one unless you can use some brake cleaner and air pressure to try and clean the insides out

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I'll check if can service/replace the o-ring. If sucessful, is a full bleed required or can I get away with the fronts only?

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If it is dual master cylinder you can proabally gravity bleed the fronts only successfully. IE fill the master cylinder with brake fluid and open the right front, keep it open until it starts to leak fluid steadily, once that side is done do the other