Well WingedRyder, I hope you've found your solution. My cool drum turned out to be an electrical issue. I found a 3 wire connection that is supposed to bring power from the driver's side drum of the trailer to the passenger side drum. One of the wires had slipped enough from the twist wire nut to apparently weaken the circuit. Once I realigned the wires I could tell I had a complete circuit because a buzzing sound now came from the drum when my wife applied the brake in the Tundra while parked in the driveway (before only a faint click could be heard). Braking power was much improved in the test drive although still not enough to lock up the wheels. The heat from each drum was now pretty evenly matched. Also, both hubs were only warm indicating the bearings were set properly. I kind of got lucky and figured this out without a voltmeter.
Maybe you have a weak circuit on your driver's side drum -- limiting braking power and forcing the passenger side drum to do all of the work. Maybe everyone who has tested the circuit has noted voltage on the driver's side without being able to note insufficiency under heavier braking. ??? Oh, I also added 4 downward clicks on the starwheel snugging the shoes to the drum on the cool side (they seemed to have lost some of my preset). Anyway, can you tell I'm fishing for your solution?
We're headed to Ouray, CO in a few weeks and I'm thankful I won't have to foot drag to slow our rig. Best of Luck to you. Drive by my house in Goodyear & I'll crawl under your rig too.
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