The brake calipers slide on pins. The pins must be lubricated. Most of the time, the lubrication will last 40,000 miles and 5-10 years between each brake job.
Your "Brake" man was not doing his job when they re-assembled, however it is impossible to prove it, so best to take it to another dealership, or better yet to a brake shop that only does brakes or larger trucks.
Fred.
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