Another electric trailer brake problem

What controller have u got more likely the settings on it or a bad connection somewhere
Will probably lock early with no load on them

Check the brake adjustment you may have the left side a bit loose and it is grabbing or there is a leaking seal and grease on the linings. the other thing that will give this sought of problem is a damaged brake drum. B

They both need to adjusted up until the wheel is locked and the backed of till the wheel turns freely without using the brake controller. B

Look for other reasons before changing the design. B

I have an ALKO system on my Campomatic, via a Tek. Prodigy - done about 20,000km I guess. From my understanding of the way electric brakes work, the "jack up, can't turn the wheel" check is probably invalid.... that is, the magnet does drag on the drum as the brakes are applied, (drag is more or less, depending on vehicle braking force), but that magnet drag actually employs the turning force of the trailer's wheel while mobile to actually bring the trailer brakes on. My brakes are worn in a number of ways, and are a bit grabby when cold, but otherwise will last awhile yet. They were great when new....... so....... if your shoe clearance adjustments are within spec, and your electrics are ok, it must be the individual friction surfaces...... why not have the drums shaved and get some changeover shoes ? Even if you don't do it yourself, that work should not cost a lot. Magnets are pricey, but if the small depth indicator holes are still there, they will have many a km left in them yet.

I had a similar problem earlier this year and it turned out to be bad earths for the brake packs.

Matt