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Odd service antilock brake system message

Waffle34

By Waffle34
in Troubleshooting & Recalls

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Waffle34 Enthusiast

Waffle34

Posted
Posted (edited)

2018 silverado LT 5.3L crew cab z71 4x4 ~39K miles.

 

SO last week after the truck was sitting for about 4-5 days i get a message thru the myChevrolet app on my phone my antilock brake system needs service. I thought weird, i go to start it and even before putting the key in i notice the pedal is rock hard and wasnt when i parked it. Also weird. Start the truck and pedal sinks a bit to normal position but service antilock brake system pops up and i swear i hear the abs activate for a split second not moving. 

 

drive it carefully down the road and get to a stop sign going mayeb 5mph and abs activates for a split second. Does it again a few miles later and same message pops up. pedal feels fine and stops fine. Shut the truck off at my destination fire it back up and no errors nothing on drive home. Drove it every day for over a week now and prolly put several hundred miles on it from slow stops, interstate exit braking, to damn near abs activating once due to a moron. No issues no lights no warnings. 

 

Last night while parked again my phone app says service antilock brake system. Start the truck and go for a quick drive and no issues no warnings no lights... im not sure if its just a placebo but ever since the initial warning and firm pedal described above the brakes MIGHT feel like they are stronger? like they work better given the same foot pressure? I know about the recall on some 14-18 silverados but that usually involves brake booster issues and hard pedal while driving.

 

So did they shove some OTA update to it that made it mad? Is it possible to have a code set and not light up a warning? I have a code reader with live data i was going to see if i can observe every wheel speed sensor output at slow speeds as ive had older vehicles get wonky when a speed sensor starts to go...

Edited by Waffle34
JimCost2014 Senior Enthusiast

JimCost2014

Posted
Posted
3 hours ago, Waffle34 said:

14-18 silverados but that usually involves brake booster issues and hard pedal

It is actually the brake vacuum pump that fails or needs the update. Lots of posts here about the problem, with fixes, and solutions.

It sits on the lower part of the engine, drivers side, and is belt driven.

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