Inconsistent Gooseneck Trailer Braking with P3 Brake Controller and Electric Over Hydraulic Brakes  

Question:

Expert Reply:

There is most likely a bad wiring connection and it could be the ground. With a weak ground that could limit the amount of voltage getting to the system so if you turned up the power on the P3 to compensate then when the connection is strong the braking is too aggressive.

There could also be an issue with one of the other wires or with the brake fluid lines themselves, and even a problem with the wheel cylinders or brake shoes.

I would start with the electrical components. You want to make sure that the brake controller is in electric over hydraulic mode. Press the menu/options button, select Brake Type and then OK. Select hydraulic and then OK and then Confirm and OK again. There should then be an H in the bottom left corner of the display.

Next make sure the trailer and vehicle side connectors are clean and free of corrosion inside and out. Make sure the main trailer connector ground and the ground for the actuator are attached to clean and corrosion free bare metal surfaces. Then inspect the wiring to make sure there are no exposed copper strands and repair as needed.

Check the fittings and make sure there is no leaking fluid and that the fluid level is correct for your actuator. If there are wet spots on the backs of the wheels and tires then that indicates a leak most likely at the wheel cylinders. You can also follow the actuator manual to bleed the brakes.

Make sure that the brake assemblies themselves can move freely and that there is no grease on the pads. Also make sure the brakes are all properly adjusted. You want a slight but constant drag on the drum when the wheel turns.

expert reply by: Michael H

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