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Posted

2015 silverado  Brakes started to get hard to push in reverse. Feels like the master cylinder is  empty but it is full. Any guess. Just started.

Posted

Check with your dealer as there may be a recall. I had same thing on my 2016. Before I actually had a problem, while having one of the oil changes done, they did a software upgrade. Later, I had the problem anyway and they replaced the vacuum booster pump. @mjm-1957 has the correct answer.

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Posted

No recall, special policy N182202780-02, vacuum pump covered for 10 years or 150,000 miles.

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