2015 Tahoe LTZ - intermittent brake assist loss at low revs - vacuum pump??

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petethepug

Michael
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Low RPM means highest vacuum. If you have a vacuum hose coming off the brake booster, replace it. They deteriorate over time and can collapse on themselves under high vacuum.

Essentially slow speed, high vacuum, hose collapses on itself and then zero vacuum and hard pedal until hose unsticks.
 
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