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Brake fluids lush and fill didn’t do the trick.
Took it to the Chevy Stealership and the service tech immediately identified it as vacuum pump failing.
This is a “well known and documented” problem with 2015 Tahoe’s and Suburbans. $512 part plus labor.
Writing up a report to the NTHSA about this known brake problem that GM seems to not care to fix.
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2023 Passport 3401QD
2015 GMC Sierra 2500 6.0L CC 4X4
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