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Rock Hard Brake Pedal - 2014 - Low Speed

35K views 17 replies 11 participants last post by  RedSLEd  
#1 ·
FYI and comment (anyone else out there having this issue?)

To my knowledge this issue is very new. I've been told that 2 police cruisers have been repaired under warranty (the 36K bumper to bumper) and 1 person has had their personal truck repaired.
Requires
-Vacuum pump (bolted to the driver side front of engine with pulley attached)
-Vacuum line between the booster and the pump
-Brake booster
-Master cylinder
-Vacuum pump belt

2014 Silverado 1500 4x4 Z71
89,000 miles
All maintenance (preventative or otherwise) performed at the same Chevrolet dealership

Background of vehicle use: 89,000 miles with 9/32 tread depth remaining on original tires. Brake pad surfaces still in "green" status by Chevrolet service department. This shows how much braking the vehicle experiences… very little compared to many other similar 2014 Silverados.

Issue first noticed May 2016 (roughly 59,000 miles on vehicle at that time)

Noticed failure of vehicle to stop. Lack of power assist braking at slow speeds. Brake pedal is rock hard with little to zero travel (1/4" at most). Vehicle will continue to move (regardless of pressure applied to brake pedal) for several feet. While this has occurred in both forward and reverse gears; the issue is consistently observed in reverse. Issue much more prevalent following owner's highway commute of 70 miles (every morning upon arrival to work backing or pulling into parking spot and every evening when backing down driveway). Issue is always observed when towing a trailer and backing up.

Service with regards to this issue thus far - January 2017: Replaced brake booster vacuum sensor/pipe (part number 23135228) "switch with pipe" was also noted on the service order. Approximately $200 charged to customer with zero beneficial results pertaining to the problem.

Chevrolet service department has repaired this same issue on 3 vehicles thus far. Two of which were at 27,000 miles and the other at 91,000 miles. Rumored to be roughly $1900 repair.
 

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#4 ·
I have seen 1-2 of these. Not the end of the world. Quick easy fix. As far as not being able to stop???? Not sure about that. I could stop both of my cases with consistency.
 
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#5 ·
1. Service department says entire brake system needs to be replaced including brake lines. Why? Is it possible that the engine oil (lubricating the vacuum pump) can make it up into the brake booster (I get that); but then into the master cylinder. That's the part I don't understand.

2. Do they have a pump made by a different manufacturer or is this just a $1,000 job every 56,000 miles?
 
#6 ·
A coworker mentioned that his brake pedal on his 2015 Sierra would get rock hard when he would be on the brakes easing up to park as close to another vehicle in his driveway. It would only happen at slow speeds and the pedal would progressively get harder as he was on and off the brakes. His fix was a sensor, quick and easy and the problem hasn't returned.
 
#8 ·
bksbigdogdoug said:
A coworker mentioned that his brake pedal on his 2015 Sierra would get rock hard when he would be on the brakes easing up to park as close to another vehicle in his driveway. It would only happen at slow speeds and the pedal would progressively get harder as he was on and off the brakes. His fix was a sensor, quick and easy and the problem hasn't returned.
Any chance you can list the part number for the sensor? Should be on his repair writeup. Wondering if its the same part they replaced on my truck.
 
#12 ·
Wow, I just posted the same issue with my 2016 Silverado (in the brake forum). Slow speed braking is impossible. The pedal goes rock hard and you cannot stop the truck. This has happened twice in two weeks, and I am taking it in to Chevy tomorrow. Luckily there was a parking stop in front of me, and not another car/truck. Scary stuff.

Did anyone figure out the fix, since there isn't a TSB??? Don't want the dealer telling my they can't reproduce the issue and then BAM I get into an accident.

I have 25K miles on my.
1500 4x4
 
#15 ·
My fix, at least for now, was the vacuum pump for the brakes. That is what the dealer swapped out, by order of GM. The spec is >13"hg, and mine was around 10"hg.

If you surf around this link, you will see that was probably the fix for most of the trucks with this issue.

Good luck...
 
#18 ·
@Walker9 That member hasn't been here for 3 years. Don't expect a response. It might be better for you to start your own thread with all the particulars about your truck.
 
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