Do your own checks:
1 Check fluid level. Add if low. Check for leaks. Tighten banjo connections.
2 Check if the rear brake bolts are tight...or missing.
3 Pull the pads or just eyeball them without pulling. If thin, or even questionable, replace them yourself in 10 minutes.
If that doesn't do it, check back here for more suggestions.
HTH, here's wishing you a simple solution, which most of them are with the brakes.
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