I suspect it is the "S" cam inside the brake area has a build up of brake dust. To clean the S Cam is not all that hard, but it is probably a truck shop job. In any case, it needs to be checked out for sure.
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Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Pete
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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