Brake Pedal Quivering on Cold Start

[WillCO]

My brake pedal has begun to quiver slightly as the starter cranks the engine. Once the engine fires, the pedal stops quivering. And it only happens cold, and even then only on very cold mornings.

I suspect it's an odd side effect of the battery losing charge - the truck has about 2.5 years and 42K on it, and that's been about time for a new battery in past experience.

Any confirms? Other ideas?

 

[dudesweet]

Resurrecting this thread. Having the EXACT same issue. It's similar to a full brake press and feeling the ABS chatter on the rotors. Mine is a Z71 and I also hear a subtle tapping on what sounds like it's coming from the skid plate.

 

[WillCO]

Resurrecting this thread. Having the EXACT same issue. It's similar to a full brake press and feeling the ABS chatter on the rotors. Mine is a Z71 and I also hear a subtle tapping on what sounds like it's coming from the skid plate.

I since replaced the battery on mine and it still happens, so it wasn't the power situation I thought it was.

I do think I have the common issue with the brake booster failing intermittently at low speed. Having that looked at during my next oil change in a few weeks. Possibly this is a side effect of that.

 

[Blackcar]

They have TSB on vacuum pump, and I believe they extended warranty for the same problem you are having. Hard braking at low speed.
Dealer should repair is a safety issue in my mind.

2017 Chevrolet Silverado 1500 Recall for Service Brakes, Hydraulic, Power Assist, Vacuum Problem #19V645000

Official Recall for 2017 CHEVROLET SILVERADO 1500 RECALL for SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM problem. Campaign #19V645000

www.arfc.org

CHEVROLET ( 19V645000 ) - US Recall News

This government agency only provides partial feeds to the public via RSS. For the full Auto Recall article please visit the original NHTSA website post: https://www.nhtsa.gov/recalls?nhtsaId=19V645000&refurl=rss Dated: SEP 06, 2019 General Motors LLC (GM) is recalling certain 2015-2017 Cadillac...

www.usrecallnews.com

 

[OR VietVet]

Have said many many times here on this forum and others. No matter what, the most important system on ANY vehicle is the brake system. It can run like a stripped ass ape and sound cool and handle like nobody's business and look like a dream but it has to stop correctly, no matter what.

 

[dudesweet]

They have TSB on vacuum pump, and I believe they extended warranty for the same problem you are having. Hard braking at low speed.
Dealer should repair is a safety issue in my mind.

2017 Chevrolet Silverado 1500 Recall for Service Brakes, Hydraulic, Power Assist, Vacuum Problem #19V645000

Official Recall for 2017 CHEVROLET SILVERADO 1500 RECALL for SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM problem. Campaign #19V645000

www.arfc.org

This is exactly what it was. They replaced the vacuum pump free of charge. Thanks!

 

[WillCO]

This is exactly what it was. They replaced the vacuum pump free of charge. Thanks!

I also just had my vacuum pump replaced free of charge. Only a week ago so far, so not long enough to test whether it fully addressed this issue - but I have high hopes.

 

[B-train]

I had the vacuum pump fail on my 2017 and almost rear-ended a car while trying to park. My wife had said the brakes seemed off, but I don't drive it everyday. Once I felt that I had her take it to the dealership and tell the story. They sheepishly admitted that there was an issue ans replaced no questions asked. What a joke