I don't have your coach but if both sets of bulbs are flickering on the high element of the bulb. 1st place I would check is the brake pedal switch. It's contact is adjusted to make contact when the pedal is depressed to a specific point. Maybe the adjustment got loose and needs readjusting or reattached. Or maybe it has gone bad, bang on the foot pedal arm to rattle the switch, does this cause the lights to flicker. If you have an electric brake unit for aux towing, Unplug it and see if your problem goes away. If one of these things don't help, then you have a 12 v line intermittently contacting your brake circuit. It could happen in a relay, it could happen at a terminal end or connection point, or it could be a chaffed wire making contact. Most wiring problems happen at a connection point. Good luck
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