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I have 2015 ford f150 2.7l twin turbo ecoboost, when I'm in a inclined and put it on reverse to get out the parking spot, my brake pedal vibrates and it feels like I just lost power or vacuum, so I pump the brake pedal and it goes back to normal, but it brakes normal going forward, I took it to Firestone they couldn't find anything wrong with brakes.

I drove it for 3 more weeks and now it started to do it going forward and reverse, took it back to Firestone they replace the vacuum power brake booster pump or vacuum pump, it was driving fine for a couple of hours and then I reverse from the parking spot and it did it again.
Any suggestions and thank you in advance
Speedometer Trip computer Car Odometer Motor vehicle
this is the light that came on.
 

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2017 F150 XL 2WD 2.7, with some extra stuff!
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Not that this has any relevance to your situation but I believe your model year is covered under the master cylinder recall. I think the master cylinder is covered leaking or not. If yours happens to be leaking they replace the power booster as well should yours actually be under that recall.
 
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