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Username Post: 2015 silverdao Vaccum pump issues        (Topic#360772)
Posts: 56
Reg: 09-10-14
05-02-20 05:39 PM - Post#2792652    

My son's 2015 silverado, while backing up, there is extra pressure in the pedal, active grade brake does not pop up on the dash. There is a severe vibration on the brake pedal but it doesnt feel like it wants to stop. When vibration goes away he can take his pedal all the way to the floor. At that point he feels like he can trust the brakes again. It has happened 5 times in the last 3 weeks. It has happened 3 times going down hill, 1 time up hill and 1 time on a flat surface.

Only happens backing up. Has a louder metal on metal sound, not the typical sound you hear when the brakes are squeling. He has 89,000 on the truck. We know he needs brake and shocks replacement, buy this sounds different from that.

Thanks for any input

Senior Moderator
Posts: 29175
Age: 50
Loc: Texas
Reg: 08-01-03
05-03-20 08:57 AM - Post#2792683    
    In response to djw1960

I don't know much about that setup but I have read on another forum that there is a recall on 3.4 million 2014-2018 GM trucks & SUV's for a vacuum pump defect that "may make it more difficult to brake at low speeds" - you can see if your truck has any open recalls at the NHTSA website:

I've also read part of the test procedure for a bad vacuum pump is to check the hose between the pump and the booster to see if oil is present. If the pump failed and allowed oil through the system, the booster must be replaced as well.


06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

Posts: 56
Reg: 09-10-14
05-03-20 11:15 AM - Post#2792692    
    In response to someotherguy

Thanks. We will look into that.

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