When towing a horse trailer recently noticed that it didn't seem to brake as well as it should. Tested by jacking gain to full (10) and slid the manual over-ride to try and lock wheels on trailer. It slowed the trailer down but wouldn't lock brakes. Also notice when applying brakes at full gain, progress bars on the bottom of the controller only showed 2-3 bars max. Is Brake controller hosed or something else to check? No error codes displayed.