Trailer Brakes actuate by controller, but are weak? How to fix?

"I think you had a bad ground.

Glad you solved it!"

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"I recently replaced my brake drums and brake assemblies with those of a well-known trailer stuff manufacturer. They said their brakes needed 10.3 volts at the most distant brake assembly. When I first tried braking they were really anemic. Manufacturer said brand new brakes are only 25% effective. They must be worn in a bit by at least twenty, 40 MPH down to 20 MPH braking cycles while allowing the brakes to cool between uses.

After I did this the brakes worked better but would not lock the tires up even on gravel. (I never did check the voltage at the most distant brake assembly). My problem was solved by replacing the two 18-gauge conductors with 10-gauge stranded copper from connector to brakes. May have been defective 18-gauge wire or maybe 18-gauge is too small for the application. Note: the two brake-related conductors (blue and white) at the connector are 10-gauge."