Forum Discussion
bartlettj
May 14, 2018Explorer
I've just upgraded my truck to one with an integrated controller (GMC 2500HD), but here are my long term observations about the P3:
1.) Mine drew power all of the time. Probably some wierd GM wiring harness thing, but I always had to unplug it if I left the truck for more than a week or the battery would go flat. It didn't seem to matter other than that.
2.) The initial setup worked well for a long time, but once I let the shoe adjustment go too long or one of the grease seals failed and got the brake shoes sticky, the brakes would get really grabby especially in the rain and then they would get weak after they got warm.
3.) The bracket needs to be mounted well so it doesn't swing when you brake hard. The P3 uses accelerometers and if you tilt it after you do your setup/dial in it will mess up the braking force under load. Same goes if you change how you tilt the vehicle by messing around with your WDH much. It also needs to be installed parallel to the direction of travel.
4.) If the trailer brakes haven't been used for a while you need to get them warm and knock the rust off the inside of the drum before you'll get consistent braking performance.
The GM integrated brake controller on my new truck is awesome. It senses the brake line pressure and modulates the trailer brakes to match. It's super easy to use and just works without any fuss.
1.) Mine drew power all of the time. Probably some wierd GM wiring harness thing, but I always had to unplug it if I left the truck for more than a week or the battery would go flat. It didn't seem to matter other than that.
2.) The initial setup worked well for a long time, but once I let the shoe adjustment go too long or one of the grease seals failed and got the brake shoes sticky, the brakes would get really grabby especially in the rain and then they would get weak after they got warm.
3.) The bracket needs to be mounted well so it doesn't swing when you brake hard. The P3 uses accelerometers and if you tilt it after you do your setup/dial in it will mess up the braking force under load. Same goes if you change how you tilt the vehicle by messing around with your WDH much. It also needs to be installed parallel to the direction of travel.
4.) If the trailer brakes haven't been used for a while you need to get them warm and knock the rust off the inside of the drum before you'll get consistent braking performance.
The GM integrated brake controller on my new truck is awesome. It senses the brake line pressure and modulates the trailer brakes to match. It's super easy to use and just works without any fuss.
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