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I have never had a vehicle with drum brakes NOT do this.
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think you might be a bit strong on that !
i've been driving for a few years and go back to mechanical brakes ( not juice ones)
and have pulled a boat or two out of the water and never had trouble.
have the drum brakes been checked and lubed and emergency brake adjusted?
if so then i would think about maybe the shoe material ( disk brakes have pads drums have shoes)
the shoe material could expand? but for the drums to "weld up" in a few hours sure seems strange to me. maybe try another brand of shoes?
don't know if there is any re-routing of the e-brake on a lift, but think they are stretching it to blame the lift myself.
are they just using a cable to pull a shoe or playing some game with the slave cylinder? if playing with the slave cylinder they could be multiplying the mech advantage and setting the shoe way too hard?