markm wrote:
Hi all: considering a GMC 3500 HD DRW. My current 5er has the Titan hydraulic disc brake system, which requires my Prodigy P3 brake controller to be set in the hydraulic over electric mode. My question has to do with the integrated brake controller on the GM HD trucks. Will the integrated brake controller work with hydraulic disc trailer brakes?
2015 and newer HD trucks have hydraulic over electric support from the factory.
If yours is 2014 or prior, the problem is the integrated controller doesn't sense the electric over hydraulic actuator and so it never senses a trailer is connected and thus never activates the trailer brakes.
You can get it working by wiring a regular electric brake magnet in parallel with the actuator -- this will fool the truck's integrated brake controller into operating as if there was an electric system on there.
See here for an example solution..
